Vulnerability Monitor

The vendors, products, and vulnerabilities you care about

CVE-2021-21300

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

2021-03-09T20:15:13.260

Last Modified

2024-11-21T05:47:58.407

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 8.0 (HIGH)

CVSSv2 Vector

AV:N/AC:H/Au:N/C:P/I:P/A:P

  • Access Vector: NETWORK
  • Access Complexity: HIGH
  • Authentication: NONE
  • Confidentiality Impact: PARTIAL
  • Integrity Impact: PARTIAL
  • Availability Impact: PARTIAL
Exploitability Score

4.9

Impact Score

6.4

Weaknesses
  • Type: Secondary
    CWE-59
  • Type: Primary
    CWE-59
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application git-scm git ≤ 2.14.2 Yes
Application git-scm git < 2.17.6 Yes
Application git-scm git < 2.18.5 Yes
Application git-scm git < 2.19.6 Yes
Application git-scm git < 2.20.5 Yes
Application git-scm git < 2.21.4 Yes
Application git-scm git < 2.22.5 Yes
Application git-scm git < 2.23.4 Yes
Application git-scm git < 2.24.4 Yes
Application git-scm git < 2.25.5 Yes
Application git-scm git < 2.26.3 Yes
Application git-scm git < 2.29.3 Yes
Application git-scm git < 2.30.2 Yes
Application git-scm git 2.27.0 Yes
Application git-scm git 2.28.0 Yes
Operating System fedoraproject fedora 32 Yes
Operating System fedoraproject fedora 33 Yes
Operating System fedoraproject fedora 34 Yes
Application apple xcode < 12.5 Yes
Operating System apple macos ≥ 11.0 No
Operating System debian debian_linux 10.0 Yes
References