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CVE-2022-24713

Published: 8 March 2022

regex is an implementation of regular expressions for the Rust language. The regex crate features built-in mitigations to prevent denial of service attacks caused by untrusted regexes, or untrusted input matched by trusted regexes. Those (tunable) mitigations already provide sane defaults to prevent attacks. This guarantee is documented and it's considered part of the crate's API. Unfortunately a bug was discovered in the mitigations designed to prevent untrusted regexes to take an arbitrary amount of time during parsing, and it's possible to craft regexes that bypass such mitigations. This makes it possible to perform denial of service attacks by sending specially crafted regexes to services accepting user-controlled, untrusted regexes. All versions of the regex crate before or equal to 1.5.4 are affected by this issue. The fix is include starting from regex 1.5.5. All users accepting user-controlled regexes are recommended to upgrade immediately to the latest version of the regex crate. Unfortunately there is no fixed set of problematic regexes, as there are practically infinite regexes that could be crafted to exploit this vulnerability. Because of this, it us not recommend to deny known problematic regexes.

Notes

AuthorNote
eslerm
adding thunderbird per mfsa2022-15
Priority

Medium

CVSS 3 base score: 7.5

Status

Package Release Status
firefox
Launchpad, Ubuntu, Debian
bionic
Released (99.0+build2-0ubuntu0.18.04.2)
focal
Released (99.0+build2-0ubuntu0.20.04.2)
impish
Released (99.0+build2-0ubuntu0.21.10.2)
jammy
Released (1:1snap1-0ubuntu1)
trusty Ignored
(out of standard support)
upstream
Released (99)
xenial Needs triage

rust-regex
Launchpad, Ubuntu, Debian
focal
Released (1.2.1-3ubuntu0.1)
impish Ignored
(reached end-of-life)
jammy
Released (1.5.4-1ubuntu0.1)
trusty Ignored
(out of standard support)
upstream
Released (1.5.5)
xenial Ignored
(out of standard support)
thunderbird
Launchpad, Ubuntu, Debian
bionic
Released (1:91.8.1+build1-0ubuntu0.18.04.1)
focal
Released (1:91.8.1+build1-0ubuntu0.20.04.1)
impish
Released (1:91.8.1+build1-0ubuntu0.21.10.1)
jammy Not vulnerable

upstream
Released (91.8)
xenial Needs triage