<p>Upgrade <code>Alpine:3.16</code> <code>git</code> to version 2.30.2-r0 or higher.</p>

Link Following Affecting git package, versions <2.30.2-r0

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84.99% (99^th percentile)

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Snyk ID SNYK-ALPINE316-GIT-2842448
published 10 Mar 2021
disclosed 9 Mar 2021

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Introduced: 9 Mar 2021

CVE-2021-21300 Open this link in a new tab CWE-59 Open this link in a new tab

How to fix?

Upgrade Alpine:3.16 git to version 2.30.2-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream git package and not the git package as distributed by Alpine. See How to fix? for Alpine:3.16 relevant fixed versions and status.

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.

References

CVSS Scores

version 3.1

Attack Vector (AV)

Network
Attack Complexity (AC)

High
Privileges Required (PR)

None
User Interaction (UI)

Required

Scope (S)

Unchanged

Confidentiality (C)

High
Integrity (I)

High
Availability (A)

High

Link Following Affecting git package, versions <2.30.2-r0

Severity

Snyk's Security Team recommends NVD's CVSS assessment