medium
5.5
CWE
200 59
Advisory Published
Updated

CVE-2022-39253: Git subject to exposure of sensitive information via local clone of symbolic links

First published: Tue Oct 18 2022(Updated: )

Git is an open source, scalable, distributed revision control system. Versions prior to 2.30.6, 2.31.5, 2.32.4, 2.33.5, 2.34.5, 2.35.5, 2.36.3, and 2.37.4 are subject to exposure of sensitive information to a malicious actor. When performing a local clone (where the source and target of the clone are on the same volume), Git copies the contents of the source's `$GIT_DIR/objects` directory into the destination by either creating hardlinks to the source contents, or copying them (if hardlinks are disabled via `--no-hardlinks`). A malicious actor could convince a victim to clone a repository with a symbolic link pointing at sensitive information on the victim's machine. This can be done either by having the victim clone a malicious repository on the same machine, or having them clone a malicious repository embedded as a bare repository via a submodule from any source, provided they clone with the `--recurse-submodules` option. Git does not create symbolic links in the `$GIT_DIR/objects` directory. The problem has been patched in the versions published on 2022-10-18, and backported to v2.30.x. Potential workarounds: Avoid cloning untrusted repositories using the `--local` optimization when on a shared machine, either by passing the `--no-local` option to `git clone` or cloning from a URL that uses the `file://` scheme. Alternatively, avoid cloning repositories from untrusted sources with `--recurse-submodules` or run `git config --global protocol.file.allow user`.

Credit: Cory Snider Mirantis security-advisories@github.com security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
redhat/git<0:2.39.1-1.el8
0:2.39.1-1.el8
redhat/git<0:2.39.1-1.el9
0:2.39.1-1.el9
<2.30.6
>=2.31.0<2.31.5
>=2.32.0<2.32.4
>=2.33.0<2.33.5
>=2.34.0<2.34.5
>=2.35.0<2.35.5
>=2.36.0<2.36.3
>=2.37.0<2.37.4
=2.38.0
=35
=36
=37
<14.1
=10.0
Git-scm Git<2.30.6
Git-scm Git>=2.31.0<2.31.5
Git-scm Git>=2.32.0<2.32.4
Git-scm Git>=2.33.0<2.33.5
Git-scm Git>=2.34.0<2.34.5
Git-scm Git>=2.35.0<2.35.5
Git-scm Git>=2.36.0<2.36.3
Git-scm Git>=2.37.0<2.37.4
Git-scm Git=2.38.0
Fedoraproject Fedora=35
Fedoraproject Fedora=36
Fedoraproject Fedora=37
Apple Xcode<14.1
Debian Debian Linux=10.0
redhat/git<2.30.6
2.30.6
redhat/git<2.31.5
2.31.5
redhat/git<2.32.4
2.32.4
redhat/git<2.33.5
2.33.5
redhat/git<2.34.5
2.34.5
redhat/git<2.35.5
2.35.5
redhat/git<2.36.3
2.36.3
redhat/git<2.37.4
2.37.4
Apple Xcode<14.1
14.1

Remedy

Avoid cloning untrusted repositories using the `--local` optimization when on a shared machine, either by passing the `--no-local` option to `git clone` or cloning from a URL that uses the `file://` scheme. Alternatively, avoid cloning repositories from untrusted sources with `--recurse-submodules` or run `git config --global protocol.file.allow user`.

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

  • What is CVE-2022-39253?

    CVE-2022-39253 is a vulnerability in Git that allows sensitive information exposure to a malicious actor.

  • What is the severity of CVE-2022-39253?

    CVE-2022-39253 has a severity of medium.

  • Which software versions are affected by CVE-2022-39253?

    Versions prior to 2.30.6, 2.31.5, 2.32.4, 2.33.5, 2.34.5, 2.35.5, 2.36.3, and 2.37.4 of Git are affected by CVE-2022-39253.

  • How can I fix CVE-2022-39253?

    To fix CVE-2022-39253, update Git to version 2.30.6, 2.31.5, 2.32.4, 2.33.5, 2.34.5, 2.35.5, 2.36.3, or 2.37.4.

  • Where can I find more information about CVE-2022-39253?

    You can find more information about CVE-2022-39253 on the CVE website, NIST's vulnerability database, and the Red Hat Bugzilla and Errata pages.

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