#VU83017 Server-Side Request Forgery (SSRF) in Discourse - CVE-2023-47121

Vulnerability identifier: #VU83017

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-47121

CWE-ID: CWE-918

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Discourse
Web applications / Forum & blogging software

Vendor: Civilized Discourse Construction Kit, Inc.

Description

The disclosed vulnerability allows a remote attacker to perform SSRF attacks.

The vulnerability exists due to insufficient validation of user-supplied input in Embedding. A remote attacker can send a specially crafted HTTP request and trick the application to initiate requests to arbitrary systems.

Successful exploitation of this vulnerability may allow a remote attacker gain access to sensitive data, located in the local network or send malicious requests to other servers from the vulnerable system.

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-hp24-94qf-8cgc
https://github.com/discourse/discourse/commit/24cca10da731734af4e9748de99a508d586e59f1
https://github.com/discourse/discourse/commit/5f20748e402223b265e6fee381472c14e2604da6

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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.