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CVE-2023-25824

Published: 23 February 2023

Mod_gnutls is a TLS module for Apache HTTPD based on GnuTLS. Versions from 0.9.0 to 0.12.0 (including) did not properly fail blocking read operations on TLS connections when the transport hit timeouts. Instead it entered an endless loop retrying the read operation, consuming CPU resources. This could be exploited for denial of service attacks. If trace level logging was enabled, it would also produce an excessive amount of log output during the loop, consuming disk space. The problem has been fixed in commit d7eec4e598158ab6a98bf505354e84352f9715ec, please update to version 0.12.1. There are no workarounds, users who cannot update should apply the errno fix detailed in the security advisory.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
mod-gnutls
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
focal Needed

jammy Needed

kinetic Not vulnerable
(code not present)
lunar Ignored
(end of life, was needs-triage)
mantic Ignored
(end of life, was needs-triage)
noble Does not exist

trusty Ignored
(end of standard support)
upstream Needs triage

xenial Not vulnerable
(code not present)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H