#VU83016 Input validation error in Discourse - CVE-2023-45806

Vulnerability identifier: #VU83016

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-45806

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Discourse
Web applications / Forum & blogging software

Vendor: Civilized Discourse Construction Kit, Inc.

Description

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

The vulnerability exists due to regexp injection issue in Full Name. A remote user can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Discourse: 3.0 beta - 3.2.0 beta2

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External links
https://github.com/discourse/discourse/security/advisories/GHSA-hcgf-hg2g-mw78
https://github.com/discourse/discourse/commit/2ec25105179199cf80912bf011c18b8b870e1863
https://github.com/discourse/discourse/commit/7d484864fe91ff79c478f57e7ddb1235d701921e

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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