CVE-2022-20001

Published: 14 March 2022

fish is a command line shell. fish version 3.1.0 through version 3.3.1 is vulnerable to arbitrary code execution. git repositories can contain per-repository configuration that change the behavior 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 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. As a workaround, remove the `fish_git_prompt` function from the prompt.

Priority

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package	Release	Status
fish Launchpad, Ubuntu, Debian	bionic	Not vulnerable (code not present)
	focal	Released (3.1.0-1.2ubuntu0.1~esm1) Available with Ubuntu Pro
	impish	Ignored (end of life)
	jammy	Released (3.3.1+ds-3ubuntu0.1~esm1) Available with Ubuntu Pro
	kinetic	Ignored (end of life, was needed)
	lunar	Not vulnerable (3.5.1+ds-1)
	mantic	Not vulnerable (3.5.1+ds-1)
	trusty	Ignored (end of standard support, was not-affected)
	upstream	Released (3.4.0)
	xenial	Not vulnerable (code not present)
	Patches: upstream: https://github.com/fish-shell/fish-shell/commit/37625053d424c1ab88de2b0c50c7fe71e1468e2c

Severity score breakdown

Parameter	Value
Base score	7.8
Attack vector	Local
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

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