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.
Published 2021-03-09 20:15:13
Updated 2022-12-06 21:38:15
Source GitHub, Inc.
View at NVD,   CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2021-21300

88.54%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 99 %
Percentile, the proportion of vulnerabilities that are scored at or less

Metasploit modules for CVE-2021-21300

  • Git LFS Clone Command Exec
    Disclosure Date: 2021-04-26
    First seen: 2022-12-23
    exploit/multi/http/git_lfs_clone_command_exec
    Git clients that support delay-capable clean / smudge filters and symbolic links on case-insensitive file systems are vulnerable to remote code execution while cloning a repository. Usage of clean / smudge filters through Git LFS and a case-insensi

CVSS scores for CVE-2021-21300

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
5.1
MEDIUM AV:N/AC:H/Au:N/C:P/I:P/A:P
4.9
6.4
NIST
7.5
HIGH CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
1.6
5.9
NIST
8.0
HIGH CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
1.6
5.8
GitHub, Inc.

CWE ids for CVE-2021-21300

References for CVE-2021-21300

Products affected by CVE-2021-21300

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