User enumeration in Best Practical Request Tracker (RT)

1) Observable discrepancy

EUVDB-ID: #VU65301

Risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-38562

CWE-ID: CWE-203 - Observable discrepancy

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to observable discrepancy in the lib/RT/REST2/Middleware/Auth.pm. A remote attacker can enumerate application users.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Request Tracker: 4.2.0 - 5.0.1

External links

http://docs.bestpractical.com/release-notes/rt/index.html
http://github.com/bestpractical/rt/commit/70749bb66cb13dd70bd53340c371038a5f3ca57c
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2JK57CEEXLQF7MGBCUX76DZHXML7LUSQ/
http://lists.debian.org/debian-lts-announce/2022/06/msg00019.html

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.