CWE-78
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.
CVE-2023-0830 (GCVE-0-2023-0830)
Vulnerability from cvelistv5 – Published: 2023-02-14 16:13 – Updated: 2025-05-01 15:10
VLAI
Title
EasyNAS backup.pl system os command injection
Summary
A vulnerability classified as critical has been found in EasyNAS 1.1.0. Affected is the function system of the file /backup.pl. The manipulation leads to os command injection. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. It is recommended to upgrade the affected component.
Severity
6.3 (Medium)
6.3 (Medium)
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.220950 | vdb-entrytechnical-description |
| https://vuldb.com/?ctiid.220950 | signaturepermissions-required |
| https://vuldb.com/?submit.86683 | third-party-advisory |
| https://github.com/xbz0n/CVE-2023-0830 | exploit |
| https://www.exploit-db.com/exploits/51266 | exploit |
| https://gist.github.com/xbz0n/674af0e802efaaafe90… | exploitx_transferred |
Credits
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CVE-2023-0935 (GCVE-0-2023-0935)
Vulnerability from cvelistv5 – Published: 2023-02-21 09:19 – Updated: 2025-03-12 13:34
VLAI
Title
DolphinPHP Incomplete Fix CVE-2021-46097 common.php os command injection
Summary
A vulnerability was found in DolphinPHP up to 1.5.1. It has been declared as critical. Affected by this vulnerability is an unknown functionality of the file common.php of the component Incomplete Fix CVE-2021-46097. The manipulation of the argument id leads to os command injection. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. The associated identifier of this vulnerability is VDB-221551.
Severity
6.3 (Medium)
6.3 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-78 - OS Command Injection
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.221551 | vdb-entrytechnical-description |
| https://vuldb.com/?ctiid.221551 | signaturepermissions-required |
| https://github.com/ssteveez/dolphin/blob/main/README.md | exploit |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| n/a | DolphinPHP |
Affected:
1.5.0
Affected: 1.5.1 |
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CVE-2023-1082 (GCVE-0-2023-1082)
Vulnerability from cvelistv5 – Published: 2024-04-09 08:25 – Updated: 2024-08-21 14:01
VLAI
Title
Welotec: Command injection vulnerability in TK500v1 router series
Summary
An remote attacker with low privileges can perform a command injection which can lead to root access.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Assigner
References
1 reference
Impacted products
15 products
| Vendor | Product | Version | |
|---|---|---|---|
| Welotec | TK515L |
Affected:
0 , < v2.3.0.r5542
(semver)
|
|
| Welotec | TK515L Set |
Affected:
0 , < v2.3.0.r5542
(semver)
|
|
| Welotec | TK515L-W |
Affected:
0 , < v2.3.0.r5542
(semver)
|
|
| Welotec | TK515L-W Set |
Affected:
0 , < v2.3.0.r5542
(semver)
|
|
| Welotec | TK525L |
Affected:
0 , < v2.3.0.r5542
(semver)
|
|
| Welotec | TK525L Set |
Affected:
0 , < v2.3.0.r5542
(semver)
|
|
| Welotec | TK525L-W |
Affected:
0 , < v2.3.0.r5542
(semver)
|
|
| Welotec | TK525L-W Set |
Affected:
0 , < v2.3.0.r5542
(semver)
|
|
| Welotec | TK525U |
Affected:
0 , < v2.3.0.r5542
(semver)
|
|
| Welotec | TK525U Set |
Affected:
0 , < v2.3.0.r5542
(semver)
|
|
| Welotec | TK525W |
Affected:
0 , < v2.3.0.r5542
(semver)
|
|
| Welotec | TK525W Set |
Affected:
0 , < v2.3.0.r5542
(semver)
|
|
| Welotec | TK535L1 |
Affected:
0 , < v2.3.0.r5542
(semver)
|
|
| Welotec | TK535L1 Set |
Affected:
0 , < v2.3.0.r5542
(semver)
|
|
| welotec | tk535l1_set |
Affected:
0 , < 2.3.0.r5542
(semver)
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Credits
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CVE-2023-1350 (GCVE-0-2023-1350)
Vulnerability from cvelistv5 – Published: 2023-03-11 08:20 – Updated: 2024-08-02 05:41
VLAI
Title
liferea Feed Enrichment update.c update_job_run os command injection
Summary
A vulnerability was found in liferea. It has been rated as critical. Affected by this issue is the function update_job_run of the file src/update.c of the component Feed Enrichment. The manipulation of the argument source with the input |date >/tmp/bad-item-link.txt leads to os command injection. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The name of the patch is 8d8b5b963fa64c7a2122d1bbfbb0bed46e813e59. It is recommended to apply a patch to fix this issue. The identifier of this vulnerability is VDB-222848.
Severity
6.3 (Medium)
6.3 (Medium)
CWE
- CWE-78 - OS Command Injection
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.222848 | vdb-entrytechnical-description |
| https://vuldb.com/?ctiid.222848 | signaturepermissions-required |
| https://github.com/lwindolf/liferea/commit/8d8b5b… | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| n/a | liferea |
Affected:
1.12.0
Affected: 1.12.1 Affected: 1.12.2 Affected: 1.12.3 Affected: 1.12.4 Affected: 1.12.5 Affected: 1.12.6 Affected: 1.12.7 Affected: 1.12.8 Affected: 1.12.9 Affected: 1.13.0 Affected: 1.13.1 Affected: 1.13.2 Affected: 1.13.3 Affected: 1.13.4 Affected: 1.13.5 Affected: 1.13.6 Affected: 1.13.7 Affected: 1.13.8 Affected: 1.13.9 Affected: 1.14-RC1 Affected: 1.14-RC2 Affected: 1.14-RC3 Affected: 1.14.0 |
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CVE-2023-1698 (GCVE-0-2023-1698)
Vulnerability from cvelistv5 – Published: 2023-05-15 08:51 – Updated: 2025-01-23 19:13
VLAI
Title
WAGO: WBM Command Injection in multiple products
Summary
In multiple products of WAGO a vulnerability allows an unauthenticated, remote attacker to create new users and change the device configuration which can result in unintended behaviour, Denial of Service and full system compromise.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Assigner
References
1 reference
Impacted products
7 products
| Vendor | Product | Version | |
|---|---|---|---|
| WAGO | Compact Controller CC100 |
Affected:
FW20 , ≤ FW22
(semver)
Affected: FW23 |
|
| WAGO | Edge Controller |
Affected:
FW22
|
|
| WAGO | PFC100 |
Affected:
FW20 , ≤ FW22
(semver)
Affected: FW23 |
|
| WAGO | PFC200 |
Affected:
FW20 , ≤ FW22
(semver)
Affected: FW23 |
|
| WAGO | Touch Panel 600 Advanced Line |
Affected:
FW22
|
|
| WAGO | Touch Panel 600 Marine Line |
Affected:
FW22
|
|
| WAGO | Touch Panel 600 Standard Line |
Affected:
FW22
|
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CVE-2023-1997 (GCVE-0-2023-1997)
Vulnerability from cvelistv5 – Published: 2023-08-28 15:37 – Updated: 2024-10-02 14:14
VLAI
Title
OS Command Injection vulnerability affecting SIMULIA 3DOrchestrate from Release 3DEXPERIENCE R2021x through Release 3DEXPERIENCE R2023x
Summary
An OS Command Injection vulnerability exists in SIMULIA 3DOrchestrate from Release 3DEXPERIENCE R2021x through Release 3DEXPERIENCE R2023x. A specially crafted HTTP request can lead to arbitrary command execution.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Dassault Systèmes | SIMULIA 3DOrchestrate |
Affected:
Release 3DEXPERIENCE R2021x Golden , ≤ Release 3DEXPERIENCE R2021x.FP.CFA.2306
(custom)
Affected: Release 3DEXPERIENCE R2022x Golden , ≤ Release 3DEXPERIENCE R2022x FP.CFA.2310 (custom) Affected: Release 3DEXPERIENCE R2023x Golden , ≤ Release 3DEXPERIENCE R2023x.FP.CFA.2314 (custom) |
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CVE-2023-20013 (GCVE-0-2023-20013)
Vulnerability from cvelistv5 – Published: 2023-08-16 21:01 – Updated: 2024-11-21 21:41
VLAI
Summary
Multiple vulnerabilities in Cisco Intersight Private Virtual Appliance could allow an authenticated, remote attacker to execute arbitrary commands using root-level privileges. The attacker would need to have Administrator privileges on the affected device to exploit these vulnerabilities.
These vulnerabilities are due to insufficient input validation when extracting uploaded software packages. An attacker could exploit these vulnerabilities by authenticating to an affected device and uploading a crafted software package. A successful exploit could allow the attacker to execute commands on the underlying operating system with root-level privileges.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Cisco | Cisco Intersight Virtual Appliance |
Affected:
1.0.9-113
Affected: 1.0.9-148 Affected: 1.0.9-230 Affected: 1.0.9-53 Affected: 1.0.9-7 Affected: 1.0.9-197 Affected: 1.0.9-170 Affected: 1.0.9-149 Affected: 1.0.9-278 Affected: 1.0.9-184 Affected: 1.0.9-232 Affected: 1.0.9-83 Affected: 1.0.9-90 Affected: 1.0.9-97 Affected: 1.0.9-125 Affected: 1.0.9-250 Affected: 1.0.9-77 Affected: 1.0.9-133 Affected: 1.0.9-67 Affected: 1.0.9-214 Affected: 1.0.9-103 Affected: 1.0.9-266 Affected: 1.0.9-13 Affected: 1.0.9-164 Affected: 1.0.9-292 Affected: 1.0.9-302 Affected: 1.0.9-319 Affected: 1.0.9-343 Affected: 1.0.9-360 Affected: 1.0.9-361 Affected: 1.0.9-378 Affected: 1.0.9-389 Affected: 1.0.9-402 Affected: 1.0.9-428 Affected: 1.0.9-442 Affected: 1.0.9-456 Affected: 1.0.9-503 Affected: 1.0.9-536 Affected: 1.0.9-538 Affected: 1.0.9-558 Affected: 1.0.9-561 |
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CVE-2023-20015 (GCVE-0-2023-20015)
Vulnerability from cvelistv5 – Published: 2023-02-23 00:00 – Updated: 2024-10-28 16:33
VLAI
Title
Cisco Firepower 4100 Series, Firepower 9300 Security Appliances, and UCS Fabric Interconnects Command Injection Vulnerability
Summary
A vulnerability in the CLI of Cisco Firepower 4100 Series, Cisco Firepower 9300 Security Appliances, and Cisco UCS 6200, 6300, 6400, and 6500 Series Fabric Interconnects could allow an authenticated, local attacker to inject unauthorized commands. This vulnerability is due to insufficient input validation of commands supplied by the user. An attacker could exploit this vulnerability by authenticating to a device and submitting crafted input to the affected command. A successful exploit could allow the attacker to execute unauthorized commands within the CLI. An attacker with Administrator privileges could also execute arbitrary commands on the underlying operating system of Cisco UCS 6400 and 6500 Series Fabric Interconnects with root-level privileges.
Severity
6 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://sec.cloudapps.cisco.com/security/center/c… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Cisco | Cisco Unified Computing System (Managed) |
Affected:
n/a
|
Date Public
2023-02-23 00:00
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CVE-2023-20017 (GCVE-0-2023-20017)
Vulnerability from cvelistv5 – Published: 2023-08-16 21:01 – Updated: 2024-08-02 08:57
VLAI
Summary
Multiple vulnerabilities in Cisco Intersight Private Virtual Appliance could allow an authenticated, remote attacker to execute arbitrary commands using root-level privileges. The attacker would need to have Administrator privileges on the affected device to exploit these vulnerabilities.
These vulnerabilities are due to insufficient input validation when extracting uploaded software packages. An attacker could exploit these vulnerabilities by authenticating to an affected device and uploading a crafted software package. A successful exploit could allow the attacker to execute commands on the underlying operating system with root-level privileges.
Severity
6.5 (Medium)
CWE
- CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Cisco | Cisco Intersight Virtual Appliance |
Affected:
1.0.9-113
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CVE-2023-20021 (GCVE-0-2023-20021)
Vulnerability from cvelistv5 – Published: 2023-04-05 00:00 – Updated: 2024-10-28 16:31
VLAI
Title
Cisco Identity Services Engine Privilege Escalation Vulnerabilities
Summary
Multiple vulnerabilities in specific Cisco Identity Services Engine (ISE) CLI commands could allow an authenticated, local attacker to perform command injection attacks on the underlying operating system and elevate privileges to root. To exploit these vulnerabilities, an attacker must have valid Administrator privileges on the affected device. These vulnerabilities are due to insufficient validation of user-supplied input. An attacker could exploit these vulnerabilities by submitting a crafted CLI command. A successful exploit could allow the attacker to elevate privileges to root.
Severity
6 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://sec.cloudapps.cisco.com/security/center/c… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Cisco | Cisco Identity Services Engine Software |
Affected:
n/a
|
Date Public
2023-02-01 00:00
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Mitigation
Phase: Architecture and Design
Description:
- If at all possible, use library calls rather than external processes to recreate the desired functionality.
Mitigation ID: MIT-22
Phases: Architecture and Design, Operation
Strategy: Sandbox or Jail
Description:
- Run the code in a "jail" or similar sandbox environment that enforces strict boundaries between the process and the operating system. This may effectively restrict which files can be accessed in a particular directory or which commands can be executed by the software.
- OS-level examples include the Unix chroot jail, AppArmor, and SELinux. In general, managed code may provide some protection. For example, java.io.FilePermission in the Java SecurityManager allows the software to specify restrictions on file operations.
- This may not be a feasible solution, and it only limits the impact to the operating system; the rest of the application may still be subject to compromise.
- Be careful to avoid CWE-243 and other weaknesses related to jails.
Mitigation
Phase: Architecture and Design
Strategy: Attack Surface Reduction
Description:
- For any data that will be used to generate a command to be executed, keep as much of that data out of external control as possible. For example, in web applications, this may require storing the data locally in the session's state instead of sending it out to the client in a hidden form field.
Mitigation ID: MIT-15
Phase: Architecture and Design
Description:
- For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
Mitigation ID: MIT-4.3
Phase: Architecture and Design
Strategy: Libraries or Frameworks
Description:
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
- For example, consider using the ESAPI Encoding control [REF-45] or a similar tool, library, or framework. These will help the programmer encode outputs in a manner less prone to error.
Mitigation ID: MIT-28
Phase: Implementation
Strategy: Output Encoding
Description:
- While it is risky to use dynamically-generated query strings, code, or commands that mix control and data together, sometimes it may be unavoidable. Properly quote arguments and escape any special characters within those arguments. The most conservative approach is to escape or filter all characters that do not pass an extremely strict allowlist (such as everything that is not alphanumeric or white space). If some special characters are still needed, such as white space, wrap each argument in quotes after the escaping/filtering step. Be careful of argument injection (CWE-88).
Mitigation
Phase: Implementation
Description:
- If the program to be executed allows arguments to be specified within an input file or from standard input, then consider using that mode to pass arguments instead of the command line.
Mitigation ID: MIT-27
Phase: Architecture and Design
Strategy: Parameterization
Description:
- If available, use structured mechanisms that automatically enforce the separation between data and code. These mechanisms may be able to provide the relevant quoting, encoding, and validation automatically, instead of relying on the developer to provide this capability at every point where output is generated.
- Some languages offer multiple functions that can be used to invoke commands. Where possible, identify any function that invokes a command shell using a single string, and replace it with a function that requires individual arguments. These functions typically perform appropriate quoting and filtering of arguments. For example, in C, the system() function accepts a string that contains the entire command to be executed, whereas execl(), execve(), and others require an array of strings, one for each argument. In Windows, CreateProcess() only accepts one command at a time. In Perl, if system() is provided with an array of arguments, then it will quote each of the arguments.
Mitigation ID: MIT-5
Phase: Implementation
Strategy: Input Validation
Description:
- Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
- When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
- Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
- When constructing OS command strings, use stringent allowlists that limit the character set based on the expected value of the parameter in the request. This will indirectly limit the scope of an attack, but this technique is less important than proper output encoding and escaping.
- Note that proper output encoding, escaping, and quoting is the most effective solution for preventing OS command injection, although input validation may provide some defense-in-depth. This is because it effectively limits what will appear in output. Input validation will not always prevent OS command injection, especially if you are required to support free-form text fields that could contain arbitrary characters. For example, when invoking a mail program, you might need to allow the subject field to contain otherwise-dangerous inputs like ";" and ">" characters, which would need to be escaped or otherwise handled. In this case, stripping the character might reduce the risk of OS command injection, but it would produce incorrect behavior because the subject field would not be recorded as the user intended. This might seem to be a minor inconvenience, but it could be more important when the program relies on well-structured subject lines in order to pass messages to other components.
- Even if you make a mistake in your validation (such as forgetting one out of 100 input fields), appropriate encoding is still likely to protect you from injection-based attacks. As long as it is not done in isolation, input validation is still a useful technique, since it may significantly reduce your attack surface, allow you to detect some attacks, and provide other security benefits that proper encoding does not address.
Mitigation ID: MIT-21
Phase: Architecture and Design
Strategy: Enforcement by Conversion
Description:
- When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
Mitigation ID: MIT-32
Phase: Operation
Strategy: Compilation or Build Hardening
Description:
- Run the code in an environment that performs automatic taint propagation and prevents any command execution that uses tainted variables, such as Perl's "-T" switch. This will force the program to perform validation steps that remove the taint, although you must be careful to correctly validate your inputs so that you do not accidentally mark dangerous inputs as untainted (see CWE-183 and CWE-184).
Mitigation ID: MIT-32
Phase: Operation
Strategy: Environment Hardening
Description:
- Run the code in an environment that performs automatic taint propagation and prevents any command execution that uses tainted variables, such as Perl's "-T" switch. This will force the program to perform validation steps that remove the taint, although you must be careful to correctly validate your inputs so that you do not accidentally mark dangerous inputs as untainted (see CWE-183 and CWE-184).
Mitigation ID: MIT-39
Phase: Implementation
Description:
- Ensure that error messages only contain minimal details that are useful to the intended audience and no one else. The messages need to strike the balance between being too cryptic (which can confuse users) or being too detailed (which may reveal more than intended). The messages should not reveal the methods that were used to determine the error. Attackers can use detailed information to refine or optimize their original attack, thereby increasing their chances of success.
- If errors must be captured in some detail, record them in log messages, but consider what could occur if the log messages can be viewed by attackers. Highly sensitive information such as passwords should never be saved to log files.
- Avoid inconsistent messaging that might accidentally tip off an attacker about internal state, such as whether a user account exists or not.
- In the context of OS Command Injection, error information passed back to the user might reveal whether an OS command is being executed and possibly which command is being used.
Mitigation
Phase: Operation
Strategy: Sandbox or Jail
Description:
- Use runtime policy enforcement to create an allowlist of allowable commands, then prevent use of any command that does not appear in the allowlist. Technologies such as AppArmor are available to do this.
Mitigation ID: MIT-29
Phase: Operation
Strategy: Firewall
Description:
- Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth [REF-1481].
Mitigation ID: MIT-17
Phases: Architecture and Design, Operation
Strategy: Environment Hardening
Description:
- Run your code using the lowest privileges that are required to accomplish the necessary tasks [REF-76]. If possible, create isolated accounts with limited privileges that are only used for a single task. That way, a successful attack will not immediately give the attacker access to the rest of the software or its environment. For example, database applications rarely need to run as the database administrator, especially in day-to-day operations.
Mitigation ID: MIT-16
Phases: Operation, Implementation
Strategy: Environment Hardening
Description:
- When using PHP, configure the application so that it does not use register_globals. During implementation, develop the application so that it does not rely on this feature, but be wary of implementing a register_globals emulation that is subject to weaknesses such as CWE-95, CWE-621, and similar issues.
CAPEC-108: Command Line Execution through SQL Injection
An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.
CAPEC-15: Command Delimiters
An attack of this type exploits a programs' vulnerabilities that allows an attacker's commands to be concatenated onto a legitimate command with the intent of targeting other resources such as the file system or database. The system that uses a filter or denylist input validation, as opposed to allowlist validation is vulnerable to an attacker who predicts delimiters (or combinations of delimiters) not present in the filter or denylist. As with other injection attacks, the attacker uses the command delimiter payload as an entry point to tunnel through the application and activate additional attacks through SQL queries, shell commands, network scanning, and so on.
CAPEC-43: Exploiting Multiple Input Interpretation Layers
An attacker supplies the target software with input data that contains sequences of special characters designed to bypass input validation logic. This exploit relies on the target making multiples passes over the input data and processing a "layer" of special characters with each pass. In this manner, the attacker can disguise input that would otherwise be rejected as invalid by concealing it with layers of special/escape characters that are stripped off by subsequent processing steps. The goal is to first discover cases where the input validation layer executes before one or more parsing layers. That is, user input may go through the following logic in an application: <parser1> --> <input validator> --> <parser2>. In such cases, the attacker will need to provide input that will pass through the input validator, but after passing through parser2, will be converted into something that the input validator was supposed to stop.
CAPEC-6: Argument Injection
An attacker changes the behavior or state of a targeted application through injecting data or command syntax through the targets use of non-validated and non-filtered arguments of exposed services or methods.
CAPEC-88: OS Command Injection
In this type of an attack, an adversary injects operating system commands into existing application functions. An application that uses untrusted input to build command strings is vulnerable. An adversary can leverage OS command injection in an application to elevate privileges, execute arbitrary commands and compromise the underlying operating system.