CVE-2021-21300 (GCVE-0-2021-21300)
Vulnerability from cvelistv5
Published
2021-03-09 00:00
Modified
2024-08-03 18:09
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Summary
Git is an open-source distributed revision control system. In affected versions of Git a specially crafted repository that contains symbolic links as well as files using a clean/smudge filter such as Git LFS, may cause just-checked out script to be executed while cloning onto a case-insensitive file system such as NTFS, HFS+ or APFS (i.e. the default file systems on Windows and macOS). Note that clean/smudge filters have to be configured for that. Git for Windows configures Git LFS by default, and is therefore vulnerable. The problem has been patched in the versions published on Tuesday, March 9th, 2021. As a workaound, if symbolic link support is disabled in Git (e.g. via `git config --global core.symlinks false`), the described attack won't work. Likewise, if no clean/smudge filters such as Git LFS are configured globally (i.e. _before_ cloning), the attack is foiled. As always, it is best to avoid cloning repositories from untrusted sources. The earliest impacted version is 2.14.2. The fix versions are: 2.30.1, 2.29.3, 2.28.1, 2.27.1, 2.26.3, 2.25.5, 2.24.4, 2.23.4, 2.22.5, 2.21.4, 2.20.5, 2.19.6, 2.18.5, 2.17.62.17.6.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| git | git |
Version: >= 2.14.2, < 2.17.62.17.6 Version: >= 2.18.0, < 2.18.5 Version: >= 2.19.0, < 2.19.6 Version: >= 2.20.0, < 2.20.5 Version: >= 2.21.0, < 2.21.4 Version: >= 2.22.0, < 2.22.5 Version: >= 2.23.0, < 2.23.4 Version: >= 2.24.0, < 2.24.4 Version: >= 2.25.0, < 2.25.5 Version: >= 2.26.0, < 2.26.3 Version: >= 2.27.0, < 2.27.1 Version: >= 2.28.0, < 2.28.1 Version: >= 2.29.0, < 2.29.3 Version: >= 2.30.0, < 2.30.1 |
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"url": "https://git-scm.com/docs/git-config#Documentation/git-config.txt-coresymlinks"
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{
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"version": "\u003e= 2.24.0, \u003c 2.24.4"
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{
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{
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"value": "Git is an open-source distributed revision control system. In affected versions of Git a specially crafted repository that contains symbolic links as well as files using a clean/smudge filter such as Git LFS, may cause just-checked out script to be executed while cloning onto a case-insensitive file system such as NTFS, HFS+ or APFS (i.e. the default file systems on Windows and macOS). Note that clean/smudge filters have to be configured for that. Git for Windows configures Git LFS by default, and is therefore vulnerable. The problem has been patched in the versions published on Tuesday, March 9th, 2021. As a workaound, if symbolic link support is disabled in Git (e.g. via `git config --global core.symlinks false`), the described attack won\u0027t work. Likewise, if no clean/smudge filters such as Git LFS are configured globally (i.e. _before_ cloning), the attack is foiled. As always, it is best to avoid cloning repositories from untrusted sources. The earliest impacted version is 2.14.2. The fix versions are: 2.30.1, 2.29.3, 2.28.1, 2.27.1, 2.26.3, 2.25.5, 2.24.4, 2.23.4, 2.22.5, 2.21.4, 2.20.5, 2.19.6, 2.18.5, 2.17.62.17.6."
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"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N",
"version": "3.1"
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"problemTypes": [
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"descriptions": [
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"description": "CWE-59 Improper Link Resolution Before File Access (\u0027Link Following\u0027)",
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{
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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