CVE-2021-21300

CVSS V2 Medium 5.1 CVSS V3 High 7.5
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.
Overview
  • CVE ID
  • CVE-2021-21300
  • Assigner
  • security-advisories@github.com
  • Vulnerability Status
  • Analyzed
  • Published Version
  • 2021-03-09T20:15:13
  • Last Modified Date
  • 2022-12-06T21:38:14
CPE Configuration (Product)
CPE Vulnerable Operator Version Start Version End
AND
cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* 1 OR 2.14.2
cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* 1 OR 2.17.0 2.17.6
cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* 1 OR 2.18.0 2.18.5
cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* 1 OR 2.19.0 2.19.6
cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* 1 OR 2.20.0 2.20.5
cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* 1 OR 2.21.0 2.21.4
cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* 1 OR 2.22.0 2.22.5
cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* 1 OR 2.23.0 2.23.4
cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* 1 OR 2.24.0 2.24.4
cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* 1 OR 2.25.0 2.25.5
cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* 1 OR 2.26.0 2.26.3
cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* 1 OR 2.29.0 2.29.3
cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* 1 OR 2.30.0 2.30.2
cpe:2.3:a:git-scm:git:2.27.0:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:git-scm:git:2.28.0:*:*:*:*:*:*:* 1 OR
AND
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* 1 OR
AND
cpe:2.3:a:apple:xcode:*:*:*:*:*:*:*:* 1 OR 12.5
cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* 0 OR 11.0
AND
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* 1 OR
CVSS Version 2
  • Version
  • 2.0
  • Vector String
  • AV:N/AC:H/Au:N/C:P/I:P/A:P
  • Access Vector
  • NETWORK
  • Access Compatibility
  • HIGH
  • Authentication
  • NONE
  • Confidentiality Impact
  • PARTIAL
  • Integrity Impact
  • PARTIAL
  • Availability Impact
  • PARTIAL
  • Base Score
  • 5.1
  • Severity
  • MEDIUM
  • Exploitability Score
  • 4.9
  • Impact Score
  • 6.4
CVSS Version 3
  • Version
  • 3.1
  • Vector String
  • CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
  • Attack Vector
  • NETWORK
  • Attack Compatibility
  • HIGH
  • Privileges Required
  • NONE
  • User Interaction
  • REQUIRED
  • Scope
  • UNCHANGED
  • Confidentiality Impact
  • HIGH
  • Availability Impact
  • HIGH
  • Base Score
  • 7.5
  • Base Severity
  • HIGH
  • Exploitability Score
  • 1.6
  • Impact Score
  • 5.9
History
Created Old Value New Value Data Type Notes
2022-05-10 06:53:49 Added to TrackCVE
2022-12-05 23:23:29 2021-03-09T20:15Z 2021-03-09T20:15:13 CVE Published Date updated
2022-12-05 23:23:29 2022-10-11T16:15:09 CVE Modified Date updated
2022-12-05 23:23:29 Undergoing Analysis Vulnerability Status updated
2022-12-05 23:23:34 References updated
2022-12-06 22:12:33 2022-12-06T21:38:14 CVE Modified Date updated
2022-12-06 22:12:33 Undergoing Analysis Analyzed Vulnerability Status updated