CVE-2021-21300 - CVE House
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Status published High CVE-2021-21300

malicious repositories can execute remote code while cloning

Vulnerability Description

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

Affected Vendor

Affected Software

git
Vulnerable Versions:
>= 2.14.2, < 2.17.62.17.6, >= 2.18.0, < 2.18.5, >= 2.19.0, < 2.19.6, >= 2.20.0, < 2.20.5, >= 2.21.0, < 2.21.4, >= 2.22.0, < 2.22.5, >= 2.23.0, < 2.23.4, >= 2.24.0, < 2.24.4, >= 2.25.0, < 2.25.5, >= 2.26.0, < 2.26.3, >= 2.27.0, < 2.27.1, >= 2.28.0, < 2.28.1, >= 2.29.0, < 2.29.3, >= 2.30.0, < 2.30.1

Timeline

Official Publish: March 9th, 2021
Last Modified: August 3rd, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N

Weaknesses (CWE)