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CRITICAL

httpd: Weak Digest auth nonce generation in mod_auth_digest

Published Mar 26, 2018

Description

In Apache httpd 2.2.0 to 2.4.29, when generating an HTTP Digest authentication challenge, the nonce sent to prevent reply attacks was not correctly generated using a pseudo-random seed. In a cluster of servers using a common Digest authentication configuration, HTTP requests could be replayed across servers by an attacker without detection.

Affected products

Remediation

Red Hat statement

The "AuthType Digest" directive is not enabled in the default httpd configuration as shipped with Red Hat Enterprise Linux, and needs to be explicitly enabled. Therefore this flaw has no impact on the default versions of the httpd package as shipped with Red Hat Enterprise Linux. Also upstream discourages the use of mod_auth_digest because of its inherent security weaknesses and recommends the use of mod_ssl.

Metrics

References (33)

Change history (0)

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Sources
CVE.org / MITRE
Status PUBLISHED
Assigner apache
Published Mar 26, 2018
Updated Sep 16, 2024
Reserved Dec 7, 2017
NVD
Status Modified
Modified Jun 17, 2026
Red Hat
Severity Low
Public date Mar 21, 2018