CVE-2022-24713

Publication date 8 March 2022

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

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.

Read the notes from the security team

Status

Package Ubuntu Release Status
firefox 23.04 lunar
Fixed 1:1snap1-0ubuntu1
22.10 kinetic
Fixed 1:1snap1-0ubuntu1
22.04 LTS jammy
Fixed 1:1snap1-0ubuntu1
21.10 impish
Fixed 99.0+build2-0ubuntu0.21.10.2
20.04 LTS focal
Fixed 99.0+build2-0ubuntu0.20.04.2
18.04 LTS bionic
Fixed 99.0+build2-0ubuntu0.18.04.2
16.04 LTS xenial Ignored end of standard support
14.04 LTS trusty Ignored end of standard support
rust-regex 23.04 lunar
Not affected
22.10 kinetic Ignored end of life, was needed
22.04 LTS jammy
Fixed 1.5.4-1ubuntu0.1
21.10 impish Ignored end of life
20.04 LTS focal
Fixed 1.2.1-3ubuntu0.1
16.04 LTS xenial Ignored end of standard support
14.04 LTS trusty Ignored end of standard support
thunderbird 23.04 lunar
Not affected
22.10 kinetic
Not affected
22.04 LTS jammy
Not affected
21.10 impish
Fixed 1:91.8.1+build1-0ubuntu0.21.10.1
20.04 LTS focal
Fixed 1:91.8.1+build1-0ubuntu0.20.04.1
18.04 LTS bionic
Fixed 1:91.8.1+build1-0ubuntu0.18.04.1

Notes

eslerm

adding thunderbird per mfsa2022-15

Severity score breakdown

Parameter Value
Base score 7.5 · High
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H