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Vulnerability · Published Apr 29, 2021 · Assigned by GitHub_M

CVE-2021-29468Arbitrary code execution when checking out an attacker-controlled Git branch

High 8.8

In plain English

A high-severity improper input validation in Cygwin-Git from me-and. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 69% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)1.2%top 30.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

Cygwin Git is a patch set for the git command line tool for the cygwin environment. A specially crafted repository that contains symbolic links as well as files with backslash characters in the file name may cause just-checked out code to be executed while checking out a repository using Git on Cygwin. The problem will be patched in the Cygwin Git v2.31.1-2 release. At time of writing, the vulnerability is present in the upstream Git source code; any Cygwin user who compiles Git for themselves from upstream sources should manually apply a patch to mitigate the vulnerability. As mitigation users should not clone or pull from repositories from untrusted sources. CVE-2019-1354 was an equivalent vulnerability in Git for Visual Studio.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20git0ALPINE-CVE-2021-29468
Alpine:v3.21git0ALPINE-CVE-2021-29468
Alpine:v3.22git0ALPINE-CVE-2021-29468
Alpine:v3.23git0ALPINE-CVE-2021-29468
Alpine:v3.24git0ALPINE-CVE-2021-29468

Affected products (as reported)

VendorProductVersions
me-and Cygwin-Git < 2.31.1-2

Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References