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
Weakness Enumerations
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
References
Sources
Source Name | Source URL |
---|---|
NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-21300 |
MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21300 |
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 |