Vulnerability · Published Jan 27, 2023 · Assigned by GitHub_M

CVE-2023-23621Discourse vulnerable to ReDoS in user agent parsing

High 8.6

In plain English

A high-severity regular-expression denial of service in discourse from discourse. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 59% of all known vulnerabilities).

Severity (CVSS 3.1)8.6High

Exploit odds (30 days)0.9%top 41.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Discourse is an open-source discussion platform. Prior to version 3.0.1 on the `stable` branch and version 3.1.0.beta2 on the `beta` and `tests-passed` branches, a malicious user can cause a regular expression denial of service using a carefully crafted user agent. This issue is patched in version 3.0.1 on the `stable` branch and version 3.1.0.beta2 on the `beta` and `tests-passed` branches. There are no known workarounds.

Affected products (as reported)

Vendor	Product	Versions
discourse	discourse	< 3.0.1= 3.1.0.beta1

Weakness: CWE-1333 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

References

https://github.com/discourse/discourse/security/advisories/GHSA-mrfp-54hf-jrcv x_refsource_CONFIRM
https://github.com/discourse/discourse/pull/20002 x_refsource_MISC
https://github.com/discourse/discourse/commit/6d92c3cbdac431db99a450f360a3048bb3aaf458 x_refsource_MISC