CWE-59
Improper Link Resolution Before File Access ('Link Following')
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
CVE-2021-32554 (GCVE-0-2021-32554)
Vulnerability from cvelistv5 – Published: 2021-06-12 03:40 – Updated: 2024-09-16 23:20
VLAI
Title
apport read_file() function could follow maliciously constructed symbolic links
Summary
It was discovered that read_file() in apport/hookutils.py would follow symbolic links or open FIFOs. When this function is used by the xorg package apport hooks, it could expose private data to other local users.
Severity
7.3 (High)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://bugs.launchpad.net/ubuntu/+source/apport/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Canonical | apport |
Affected:
2.20.1 , < 2.20.1-0ubuntu2.30+esm1
(custom)
Affected: 2.20.9 , < 2.20.9-0ubuntu7.24 (custom) Affected: 2.20.11-0ubuntu27 , < 2.20.11-0ubuntu27.18 (custom) Affected: 2.20.11-0ubuntu50 , < 2.20.11-0ubuntu50.7 (custom) Affected: 2.20.11-0ubuntu65 , < 2.20.11-0ubuntu65.1 (custom) Affected: 2.14.1-0ubuntu3 , < 2.14.1-0ubuntu3.29+esm7 (custom) |
Date Public
2021-05-25 00:00
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CVE-2021-32555 (GCVE-0-2021-32555)
Vulnerability from cvelistv5 – Published: 2021-06-12 03:40 – Updated: 2024-09-16 20:47
VLAI
Title
apport read_file() function could follow maliciously constructed symbolic links
Summary
It was discovered that read_file() in apport/hookutils.py would follow symbolic links or open FIFOs. When this function is used by the xorg-hwe-18.04 package apport hooks, it could expose private data to other local users.
Severity
7.3 (High)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://bugs.launchpad.net/ubuntu/+source/apport/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Canonical | apport |
Affected:
2.20.1 , < 2.20.1-0ubuntu2.30+esm1
(custom)
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Date Public
2021-05-25 00:00
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CVE-2021-32557 (GCVE-0-2021-32557)
Vulnerability from cvelistv5 – Published: 2021-06-12 03:40 – Updated: 2024-09-16 17:53
VLAI
Title
apport process_report() arbitrary file write
Summary
It was discovered that the process_report() function in data/whoopsie-upload-all allowed arbitrary file writes via symlinks.
Severity
5.2 (Medium)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://bugs.launchpad.net/ubuntu/+source/apport/… | x_refsource_MISC |
Impacted products
1 product
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|---|---|---|---|
| Canonical | apport |
Affected:
2.20.1 , < 2.20.1-0ubuntu2.30+esm1
(custom)
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Date Public
2021-05-25 00:00
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CVE-2021-35937 (GCVE-0-2021-35937)
Vulnerability from cvelistv5 – Published: 2022-08-25 00:00 – Updated: 2024-08-04 00:40
VLAI
Summary
A race condition vulnerability was found in rpm. A local unprivileged user could use this flaw to bypass the checks that were introduced in response to CVE-2017-7500 and CVE-2017-7501, potentially gaining root privileges. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Severity
No CVSS data available.
CWE
- CWE-59 - - Improper Link Resolution Before File Access ('Link Following'), CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
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CVE-2021-35938 (GCVE-0-2021-35938)
Vulnerability from cvelistv5 – Published: 2022-08-25 00:00 – Updated: 2024-08-04 00:40
VLAI
Summary
A symbolic link issue was found in rpm. It occurs when rpm sets the desired permissions and credentials after installing a file. A local unprivileged user could use this flaw to exchange the original file with a symbolic link to a security-critical file and escalate their privileges on the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Severity
No CVSS data available.
CWE
- CWE-59 - - Improper Link Resolution Before File Access ('Link Following')
Assigner
References
7 references
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CVE-2021-35939 (GCVE-0-2021-35939)
Vulnerability from cvelistv5 – Published: 2022-08-26 00:00 – Updated: 2024-08-04 00:40
VLAI
Summary
It was found that the fix for CVE-2017-7500 and CVE-2017-7501 was incomplete: the check was only implemented for the parent directory of the file to be created. A local unprivileged user who owns another ancestor directory could potentially use this flaw to gain root privileges. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Severity
No CVSS data available.
CWE
- CWE-59 - - Improper Link Resolution Before File Access ('Link Following')
Assigner
References
6 references
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CVE-2021-3641 (GCVE-0-2021-3641)
Vulnerability from cvelistv5 – Published: 2021-11-09 14:10 – Updated: 2024-09-17 02:47
VLAI
Title
Improper Link Resolution Before File Access in Bitdefender GravityZone (VA-9921)
Summary
Improper Link Resolution Before File Access ('Link Following') vulnerability in the EPAG component of Bitdefender Endpoint Security Tools for Windows allows a local attacker to cause a denial of service. This issue affects: Bitdefender GravityZone version 7.1.2.33 and prior versions.
Severity
6.1 (Medium)
CWE
- CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://www.bitdefender.com/support/security-advi… | x_refsource_MISC |
| https://www.zerodayinitiative.com/advisories/ZDI-… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Bitdefender | GravityZone |
Affected:
unspecified , ≤ 7.1.2.33
(custom)
|
Date Public
2021-10-30 00:00
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CVE-2021-37701 (GCVE-0-2021-37701)
Vulnerability from cvelistv5 – Published: 2021-08-31 00:00 – Updated: 2024-08-04 01:23
VLAI
Title
Arbitrary File Creation/Overwrite via insufficient symlink protection due to directory cache poisoning using symbolic links
Summary
The npm package "tar" (aka node-tar) before versions 4.4.16, 5.0.8, and 6.1.7 has an arbitrary file creation/overwrite and arbitrary code execution vulnerability. node-tar aims to guarantee that any file whose location would be modified by a symbolic link is not extracted. This is, in part, achieved by ensuring that extracted directories are not symlinks. Additionally, in order to prevent unnecessary stat calls to determine whether a given path is a directory, paths are cached when directories are created. This logic was insufficient when extracting tar files that contained both a directory and a symlink with the same name as the directory, where the symlink and directory names in the archive entry used backslashes as a path separator on posix systems. The cache checking logic used both `\` and `/` characters as path separators, however `\` is a valid filename character on posix systems. By first creating a directory, and then replacing that directory with a symlink, it was thus possible to bypass node-tar symlink checks on directories, essentially allowing an untrusted tar file to symlink into an arbitrary location and subsequently extracting arbitrary files into that location, thus allowing arbitrary file creation and overwrite. Additionally, a similar confusion could arise on case-insensitive filesystems. If a tar archive contained a directory at `FOO`, followed by a symbolic link named `foo`, then on case-insensitive file systems, the creation of the symbolic link would remove the directory from the filesystem, but _not_ from the internal directory cache, as it would not be treated as a cache hit. A subsequent file entry within the `FOO` directory would then be placed in the target of the symbolic link, thinking that the directory had already been created. These issues were addressed in releases 4.4.16, 5.0.8 and 6.1.7. The v3 branch of node-tar has been deprecated and did not receive patches for these issues. If you are still using a v3 release we recommend you update to a more recent version of node-tar. If this is not possible, a workaround is available in the referenced GHSA-9r2w-394v-53qc.
Severity
8.2 (High)
CWE
Assigner
References
6 references
Impacted products
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CVE-2021-37712 (GCVE-0-2021-37712)
Vulnerability from cvelistv5 – Published: 2021-08-31 00:00 – Updated: 2024-08-04 01:23
VLAI
Title
Arbitrary File Creation/Overwrite via insufficient symlink protection due to directory cache poisoning using symbolic links
Summary
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Severity
8.2 (High)
CWE
Assigner
References
6 references
Impacted products
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CVE-2021-44052 (GCVE-0-2021-44052)
Vulnerability from cvelistv5 – Published: 2022-05-05 16:50 – Updated: 2024-09-16 22:56
VLAI
Title
Arbitrary file read
Summary
An improper link resolution before file access ('Link Following') vulnerability has been reported to affect QNAP device running QuTScloud, QuTS hero, and QTS. If exploited, this vulnerability allows remote attackers to traverse the file system to unintended locations and read or overwrite the contents of unexpected files. We have already fixed this vulnerability in the following versions of QuTScloud, QuTS hero, and QTS: QuTScloud c5.0.1.1998 and later QuTS hero h4.5.4.1971 build 20220310 and later QuTS hero h5.0.0.1986 build 20220324 and later QTS 4.3.4.1976 build 20220303 and later QTS 4.3.3.1945 build 20220303 and later QTS 4.2.6 build 20220304 and later QTS 4.3.6.1965 build 20220302 and later QTS 5.0.0.1986 build 20220324 and later QTS 4.5.4.1991 build 20220329 and later
Severity
6.5 (Medium)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.qnap.com/en/security-advisory/qsa-22-16 | x_refsource_MISC |
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| QNAP Systems Inc. | QuTScloud |
Affected:
unspecified , < c5.0.1.1998
(custom)
|
|
| QNAP Systems Inc. | QuTS hero |
Affected:
unspecified , < h4.5.4.1971 build 20220310
(custom)
Affected: unspecified , < h5.0.0.1986 build 20220324 (custom) |
|
| QNAP Systems Inc. | QTS |
Affected:
unspecified , < 4.3.4.1976 build 20220303
(custom)
Affected: unspecified , < 4.3.3.1945 build 20220303 (custom) Affected: unspecified , < 4.2.6 build 20220304 (custom) Affected: unspecified , < 4.3.6.1965 build 20220302 (custom) Affected: unspecified , < 5.0.0.1986 build 20220324 (custom) Affected: unspecified , < 4.5.4.1991 build 20220329 (custom) |
Date Public
2022-05-06 00:00
Credits
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"TITLE": "Arbitrary file read"
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"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "QuTScloud",
"version": {
"version_data": [
{
"version_affected": "\u003c",
"version_value": "c5.0.1.1998"
}
]
}
},
{
"product_name": "QuTS hero",
"version": {
"version_data": [
{
"version_affected": "\u003c",
"version_value": "h4.5.4.1971 build 20220310"
},
{
"version_affected": "\u003c",
"version_value": "h5.0.0.1986 build 20220324"
}
]
}
},
{
"product_name": "QTS",
"version": {
"version_data": [
{
"version_affected": "\u003c",
"version_value": "4.3.4.1976 build 20220303"
},
{
"version_affected": "\u003c",
"version_value": "4.3.3.1945 build 20220303"
},
{
"version_affected": "\u003c",
"version_value": "4.2.6 build 20220304"
},
{
"version_affected": "\u003c",
"version_value": "4.3.6.1965 build 20220302"
},
{
"version_affected": "\u003c",
"version_value": "5.0.0.1986 build 20220324"
},
{
"version_affected": "\u003c",
"version_value": "4.5.4.1991 build 20220329"
}
]
}
}
]
},
"vendor_name": "QNAP Systems Inc."
}
]
}
},
"credit": [
{
"lang": "eng",
"value": "Enio Pena Navarro and Michael Messner from Siemens Energy AG"
}
],
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "eng",
"value": "An improper link resolution before file access (\u0027Link Following\u0027) vulnerability has been reported to affect QNAP device running QuTScloud, QuTS hero, and QTS. If exploited, this vulnerability allows remote attackers to traverse the file system to unintended locations and read or overwrite the contents of unexpected files. We have already fixed this vulnerability in the following versions of QuTScloud, QuTS hero, and QTS: QuTScloud c5.0.1.1998 and later QuTS hero h4.5.4.1971 build 20220310 and later QuTS hero h5.0.0.1986 build 20220324 and later QTS 4.3.4.1976 build 20220303 and later QTS 4.3.3.1945 build 20220303 and later QTS 4.2.6 build 20220304 and later QTS 4.3.6.1965 build 20220302 and later QTS 5.0.0.1986 build 20220324 and later QTS 4.5.4.1991 build 20220329 and later"
}
]
},
"generator": {
"engine": "Vulnogram 0.0.9"
},
"impact": {
"cvss": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
}
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "CWE-59"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://www.qnap.com/en/security-advisory/qsa-22-16",
"refsource": "MISC",
"url": "https://www.qnap.com/en/security-advisory/qsa-22-16"
}
]
},
"solution": [
{
"lang": "en",
"value": "We have already fixed this vulnerability in the following versions of QuTScloud, QuTS hero, and QTS:\nQuTScloud c5.0.1.1998 and later\nQuTS hero h4.5.4.1971 build 20220310 and later\nQuTS hero h5.0.0.1986 build 20220324 and later\nQTS 4.3.4.1976 build 20220303 and later\nQTS 4.3.3.1945 build 20220303 and later\nQTS 4.2.6 build 20220304 and later\nQTS 4.3.6.1965 build 20220302 and later\nQTS 5.0.0.1986 build 20220324 and later\nQTS 4.5.4.1991 build 20220329 and later"
}
],
"source": {
"advisory": "QSA-22-16",
"discovery": "EXTERNAL"
}
}
}
},
"cveMetadata": {
"assignerOrgId": "2fd009eb-170a-4625-932b-17a53af1051f",
"assignerShortName": "qnap",
"cveId": "CVE-2021-44052",
"datePublished": "2022-05-05T16:50:22.030Z",
"dateReserved": "2021-11-19T00:00:00.000Z",
"dateUpdated": "2024-09-16T22:56:12.420Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
Mitigation ID: MIT-48.1
Phase: Architecture and Design
Strategy: Separation of Privilege
Description:
- Follow the principle of least privilege when assigning access rights to entities in a software system.
- Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.
CAPEC-132: Symlink Attack
An adversary positions a symbolic link in such a manner that the targeted user or application accesses the link's endpoint, assuming that it is accessing a file with the link's name.
CAPEC-17: Using Malicious Files
An attack of this type exploits a system's configuration that allows an adversary to either directly access an executable file, for example through shell access; or in a possible worst case allows an adversary to upload a file and then execute it. Web servers, ftp servers, and message oriented middleware systems which have many integration points are particularly vulnerable, because both the programmers and the administrators must be in synch regarding the interfaces and the correct privileges for each interface.
CAPEC-35: Leverage Executable Code in Non-Executable Files
An attack of this type exploits a system's trust in configuration and resource files. When the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high.
CAPEC-76: Manipulating Web Input to File System Calls
An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.