Vulnerability in Fish-Shell
CVE-2022-20001
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.015 (73.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 73.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: +0.000
Affected products
- Fish-Shell — versions >= 3.1.0, < 3.4.0
- Fishshell Fish
- Debian Linux — versions 11.0
- Fedoraproject Fedora — versions 35, 36
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/fish-shell/fish-shell/security/advisories/GHSA-pj5f-6vxj-f5mq (Third Party Advisory)
- github.com/fish-shell/fish-shell/pull/8589 (Patch, Third Party Advisory)
- github.com/fish-shell/fish-shell/releases/tag/3.4.0 (Third Party Advisory, Release Notes)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- www.debian.org/security/2022/dsa-5234 (vendor-advisory, Third Party Advisory)
- security.gentoo.org/glsa/202309-10 (vendor-advisory)
Frequently asked questions
- What is CVE-2022-20001?
- CVE-2022-20001 is a high-severity vulnerability in Fish-Shell, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 7.8/10. Published 2022-03-14.
- How severe is CVE-2022-20001?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2022-20001 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.