#VU61467 Improper Neutralization of Special Elements in Output Used by a Downstream Component in fish-shell - CVE-2022-20001

Vulnerability identifier: #VU61467

Vulnerability risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2022-20001

CWE-ID: CWE-74

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
fish-shell
Other software / Other software solutions

Vendor: fish-shell

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a flaw in the "fish_git_prompt" function. A remote attacker can trick a victim to navigate a specially crafted GIT repository and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

fish-shell: 3.1.0 - 3.3.1

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External links
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

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.