Incorrect Regular Expression in Discourse



Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2023-23621
CWE-ID CWE-185
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Discourse
Web applications / Forum & blogging software

Vendor Civilized Discourse Construction Kit, Inc.

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Incorrect Regular Expression

EUVDB-ID: #VU71617

Risk: High

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2023-23621

CWE-ID: CWE-185 - Incorrect Regular Expression

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient input validation when processing regular expressions. A remote attacker can use a specially crafted user agent and perform regular expression denial of service (ReDos) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Discourse: All versions

CPE2.3 External links

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


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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