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Navigating to a compromised git repository may lead to arbitrary code exection

Moderate
zanchey published GHSA-pj5f-6vxj-f5mq Mar 12, 2022

Package

fish (C++)

Affected versions

3.1.0-3.3.1

Patched versions

3.4.0

Description

Impact

git repositories can contain per-repository configuration that change the behaviour of git, including running arbitrary commands. When using the default configuration of fish, changing to a directory automatically runs git commands in order to display information about the current repository in the prompt.

If an attacker can convince a user to change their current directory into one controlled by the attacker, such as on a shared file system or extracted archive, fish will run arbitrary commands under the attacker's control. This does not include repositories created by git clone.

Patches

This problem has been fixed in fish 3.4.0. Note that running git in these directories, including using the git tab completion, remains a potential trigger for this issue.

Workarounds

Remove the fish_git_prompt function from your prompt.

For more information

If you have any questions or comments about this advisory:

Thanks to Justin Steven for alerting us to this problem.

Severity

Moderate

CVE ID

CVE-2022-20001

Weaknesses

No CWEs

Credits