fish-shell up to 3.6.2 interpretation conflict

Summaryinfo

A vulnerability labeled as problematic has been found in fish-shell up to 3.6.2. This impacts an unknown function. The manipulation results in interpretation conflict. This vulnerability is identified as CVE-2023-49284. The attack is only possible with local access. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic has been found in fish-shell up to 3.6.2. Affected is an unknown part. The manipulation with an unknown input leads to a interpretation conflict vulnerability. CWE is classifying the issue as CWE-436. Product A handles inputs or steps differently than Product B, which causes A to perform incorrect actions based on its perception of B's state. This is going to have an impact on confidentiality, and availability. CVE summarizes:

fish is a smart and user-friendly command line shell for macOS, Linux, and the rest of the family. fish shell uses certain Unicode non-characters internally for marking wildcards and expansions. It will incorrectly allow these markers to be read on command substitution output, rather than transforming them into a safe internal representation. While this may cause unexpected behavior with direct input (for example, echo \UFDD2HOME has the same output as echo $HOME), this may become a minor security problem if the output is being fed from an external program into a command substitution where this output may not be expected. This design flaw was introduced in very early versions of fish, predating the version control system, and is thought to be present in every version of fish released in the last 15 years or more, although with different characters. Code execution does not appear to be possible, but denial of service (through large brace expansion) or information disclosure (such as variable expansion) is potentially possible under certain circumstances. fish shell 3.6.2 has been released to correct this issue. Users are advised to upgrade. There are no known workarounds for this vulnerability.

The weakness was released 12/05/2023 as GHSA-2j9r-pm96-wp4f. The advisory is shared for download at github.com. This vulnerability is traded as CVE-2023-49284 since 11/24/2023. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

Upgrading to version 3.6.2 eliminates this vulnerability. Applying the patch 09986f5563e31e2c900a606438f1d60d008f3a14 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• fish-shell

Version

• 3.6.0
• 3.6.1
• 3.6.2

License

• open-source

Website

• Product: https://github.com/fish-shell/fish-shell/

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