CVE-2022-20001 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Reference

https://github.com/fish-shell/fish-shell/pull/8589 https://github.com/fish-shell/fish-shell/security/advisories/GHSA-pj5f-6vxj-f5mq https://github.com/fish-shell/fish-shell/releases/tag/3.4.0 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TRNMYS2LKB6TKOOBQQRSRQICDMWLZ4QL/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BPZ7JV22DSZB5LNUCUEJ2HO3PKM2TVVK/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8