CVE-2021-32921

MEDIUM

prosody < 0.11.9 - Timing Attack via Non-Constant-Time String Comparison

Title source: llm
STIX 2.1

Description

An issue was discovered in Prosody before 0.11.9. It does not use a constant-time algorithm for comparing certain secret strings when running under Lua 5.2 or later. This can potentially be used in a timing attack to reveal the contents of secret strings to an attacker.

References (10)

Core 10
Core References
Release Notes, Vendor Advisory x_refsource_misc
https://blog.prosody.im/prosody-0.11.9-released/
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
http://www.openwall.com/lists/oss-security/2021/05/13/1
Mailing List, Mitigation, Third Party Advisory mailing-list x_refsource_mlist
http://www.openwall.com/lists/oss-security/2021/05/14/2
Third Party Advisory vendor-advisory x_refsource_debian
https://www.debian.org/security/2021/dsa-4916
Third Party Advisory x_refsource_misc
https://security.gentoo.org/glsa/202105-15
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2021/06/msg00016.html
Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2021/06/msg00018.html

Scores

CVSS v3 5.9
EPSS 0.0160
EPSS Percentile 72.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Details

CWE
CWE-362
Status published
Products (5)
debian/debian_linux 9.0
fedoraproject/fedora 32
fedoraproject/fedora 33
fedoraproject/fedora 34
prosody/prosody < 0.11.9
Published May 13, 2021
Tracked Since Feb 18, 2026