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GHSA-rj75-hqrm-r3gf
postcss-selector-parserImpact
. and # are not word delimiters in the tokenizer, so a flat selector such as
.a.a.a... reaches splitWord() as a single word token carrying n class or id
indexes. Three passes scanned those index arrays linearly for every index,
making the parse O(n^2) in the number of indexes rather than in input length:
uniqs(), the indices.forEach loop, and the Sass-interpolation filter.
Parsing a 400 KB flat selector took ~34 s on a modern laptop, fully occupying a
single thread. A benign selector of identical byte size parses in tens of
milliseconds, so the cost is driven by the index count, not the input size.
The nesting depth of such a selector is 0, so the maxNestingDepth guard added
in 7.1.3 offers no protection.
Reachability is deployment dependent. Only consumers that parse untrusted, attacker-supplied selectors synchronously in a request path are exposed, for example CSS sanitizers, CSS-in-JS services and online playgrounds. Ordinary build-time use on trusted sources is not affected.
Patches
Fixed in 7.1.6. The three passes now use Set membership tests, making parsing linear in the number of indexes. There is no behaviour change: parsing is byte-identical on a differential corpus of 8413 selectors.
Workarounds
Cap the size of selectors accepted from untrusted sources before parsing.
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The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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