Common Weakness Enumeration
CWE-61
AllowedUNIX Symbolic Link (Symlink) Following
Abstraction: Compound · Status: Incomplete
The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files.
327 vulnerabilities reference this CWE, most recent first.
CVE-2021-39135 (GCVE-0-2021-39135)
Vulnerability from cvelistv5 – Published: 2021-08-31 17:10 – Updated: 2024-08-04 01:58
VLAI
EPSS
VEX
Title
UNIX Symbolic Link (Symlink) Following in @npmcli/arborist
Summary
`@npmcli/arborist`, the library that calculates dependency trees and manages the node_modules folder hierarchy for the npm command line interface, aims to guarantee that package dependency contracts will be met, and the extraction of package contents will always be performed into the expected folder. This is accomplished by extracting package contents into a project's `node_modules` folder. If the `node_modules` folder of the root project or any of its dependencies is somehow replaced with a symbolic link, it could allow Arborist to write package dependencies to any arbitrary location on the file system. Note that symbolic links contained within package artifact contents are filtered out, so another means of creating a `node_modules` symbolic link would have to be employed. 1. A `preinstall` script could replace `node_modules` with a symlink. (This is prevented by using `--ignore-scripts`.) 2. An attacker could supply the target with a git repository, instructing them to run `npm install --ignore-scripts` in the root. This may be successful, because `npm install --ignore-scripts` is typically not capable of making changes outside of the project directory, so it may be deemed safe. This is patched in @npmcli/arborist 2.8.2 which is included in npm v7.20.7 and above. For more information including workarounds please see the referenced GHSA-gmw6-94gg-2rc2.
Severity
8.2 (High)
CWE
- CWE-61 - UNIX Symbolic Link (Symlink) Following
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://www.npmjs.com/package/%40npmcli/arborist | x_refsource_MISC |
| https://github.com/npm/arborist/security/advisori… | x_refsource_CONFIRM |
| https://www.oracle.com/security-alerts/cpuoct2021.html | x_refsource_MISC |
| https://cert-portal.siemens.com/productcert/pdf/s… | x_refsource_CONFIRM |
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CVE-2021-39134 (GCVE-0-2021-39134)
Vulnerability from cvelistv5 – Published: 2021-08-31 16:55 – Updated: 2024-08-04 01:58
VLAI
EPSS
VEX
Title
UNIX Symbolic Link (Symlink) Following in @npmcli/arborist
Summary
`@npmcli/arborist`, the library that calculates dependency trees and manages the `node_modules` folder hierarchy for the npm command line interface, aims to guarantee that package dependency contracts will be met, and the extraction of package contents will always be performed into the expected folder. This is, in part, accomplished by resolving dependency specifiers defined in `package.json` manifests for dependencies with a specific name, and nesting folders to resolve conflicting dependencies. When multiple dependencies differ only in the case of their name, Arborist's internal data structure saw them as separate items that could coexist within the same level in the `node_modules` hierarchy. However, on case-insensitive file systems (such as macOS and Windows), this is not the case. Combined with a symlink dependency such as `file:/some/path`, this allowed an attacker to create a situation in which arbitrary contents could be written to any location on the filesystem. For example, a package `pwn-a` could define a dependency in their `package.json` file such as `"foo": "file:/some/path"`. Another package, `pwn-b` could define a dependency such as `FOO: "file:foo.tgz"`. On case-insensitive file systems, if `pwn-a` was installed, and then `pwn-b` was installed afterwards, the contents of `foo.tgz` would be written to `/some/path`, and any existing contents of `/some/path` would be removed. Anyone using npm v7.20.6 or earlier on a case-insensitive filesystem is potentially affected. This is patched in @npmcli/arborist 2.8.2 which is included in npm v7.20.7 and above.
Severity
8.2 (High)
CWE
- CWE-61 - UNIX Symbolic Link (Symlink) Following
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/npm/arborist/security/advisori… | x_refsource_CONFIRM |
| https://www.npmjs.com/package/%40npmcli/arborist | x_refsource_MISC |
| https://www.oracle.com/security-alerts/cpuoct2021.html | x_refsource_MISC |
| https://cert-portal.siemens.com/productcert/pdf/s… | x_refsource_CONFIRM |
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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
EPSS
VEX
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
| 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
EPSS
VEX
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-2021-32554 (GCVE-0-2021-32554)
Vulnerability from cvelistv5 – Published: 2021-06-12 03:40 – Updated: 2024-09-16 23:20
VLAI
EPSS
VEX
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)
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Date Public
2021-05-25 00:00
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CVE-2021-32553 (GCVE-0-2021-32553)
Vulnerability from cvelistv5 – Published: 2021-06-12 03:40 – Updated: 2024-09-16 22:51
VLAI
EPSS
VEX
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 openjdk-17 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-2021-32552 (GCVE-0-2021-32552)
Vulnerability from cvelistv5 – Published: 2021-06-12 03:40 – Updated: 2024-09-17 02:37
VLAI
EPSS
VEX
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 openjdk-16 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-2021-32551 (GCVE-0-2021-32551)
Vulnerability from cvelistv5 – Published: 2021-06-12 03:40 – Updated: 2024-09-16 20:21
VLAI
EPSS
VEX
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 openjdk-15 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-2021-32550 (GCVE-0-2021-32550)
Vulnerability from cvelistv5 – Published: 2021-06-12 03:40 – Updated: 2024-09-16 23:22
VLAI
EPSS
VEX
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 openjdk-14 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-2021-32549 (GCVE-0-2021-32549)
Vulnerability from cvelistv5 – Published: 2021-06-12 03:40 – Updated: 2024-09-16 23:11
VLAI
EPSS
VEX
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 openjdk-13 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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"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
Mitigation
Implementation
Symbolic link attacks often occur when a program creates a tmp directory that stores files/links. Access to the directory should be restricted to the program as to prevent attackers from manipulating the files.
Mitigation MIT-48.1
Architecture and Design
Strategy: Separation of Privilege
- 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-27: Leveraging Race Conditions via Symbolic Links
This attack leverages the use of symbolic links (Symlinks) in order to write to sensitive files. An attacker can create a Symlink link to a target file not otherwise accessible to them. When the privileged program tries to create a temporary file with the same name as the Symlink link, it will actually write to the target file pointed to by the attackers' Symlink link. If the attacker can insert malicious content in the temporary file they will be writing to the sensitive file by using the Symlink. The race occurs because the system checks if the temporary file exists, then creates the file. The attacker would typically create the Symlink during the interval between the check and the creation of the temporary file.