Vulnerability Details CVE-2023-52081
ffcss is a CLI interface to apply and configure Firefox CSS themes. Prior to 0.2.0, the function `lookupPreprocess()` is meant to apply some transformations to a string by disabling characters in the regex `[-_ .]`. However, due to the use of late Unicode normalization of type NFKD, it is possible to bypass that validation and re-introduce all the characters in the regex `[-_ .]`. The `lookupPreprocess()` can be easily bypassed with equivalent Unicode characters like U+FE4D (﹍), which would result in the omitted U+005F (_), for instance. The `lookupPreprocess()` function is only ever used to search for themes loosely (case insensitively, while ignoring dashes, underscores and dots), so the actual security impact is classified as low. This vulnerability is fixed in 0.2.0. There are no known workarounds.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 33.5%
CVSS Severity
CVSS v3 Score 5.3
References
- https://github.com/ewen-lbh/ffcss/commit/f9c491874b858a32fcae15045f169fd7d02f90dc
- https://github.com/ewen-lbh/ffcss/security/advisories/GHSA-wpmx-564x-h2mh
- https://github.com/ewen-lbh/ffcss/commit/f9c491874b858a32fcae15045f169fd7d02f90dc
- https://github.com/ewen-lbh/ffcss/security/advisories/GHSA-wpmx-564x-h2mh
Products affected by CVE-2023-52081
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cpe:2.3:a:ewen-lbh:firefox_css:-
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cpe:2.3:a:ewen-lbh:firefox_css:0.1.0
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cpe:2.3:a:ewen-lbh:firefox_css:0.1.1
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cpe:2.3:a:ewen-lbh:firefox_css:0.1.2