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CRITICAL

httpd: Uninitialized memory reflection in mod_auth_digest

Published Jul 13, 2017

Description

In Apache httpd before 2.2.34 and 2.4.x before 2.4.27, the value placeholder in [Proxy-]Authorization headers of type 'Digest' was not initialized or reset before or between successive key=value assignments by mod_auth_digest. Providing an initial key with no '=' assignment could reflect the stale value of uninitialized pool memory used by the prior request, leading to leakage of potentially confidential information, and a segfault in other cases resulting in denial of service.

Affected products

Remediation

Red Hat mitigation

If you do not use digest authentication, do not load the "auth_digest_module". For example, on RHEL 7, this can be done by commenting out or removing the "LoadModule auth_digest_module modules/mod_auth_digest.so" line within the /etc/httpd/conf.modules.d/00-base.conf configuration file and restarting the service. You can then use the "httpd -t -D DUMP_MODULES" command to verify that the module is no longer loaded.

Metrics

Weaknesses (3)

CWE-20

Improper Input Validation

CWE-200

Exposure of Sensitive Information

CWE-456

References (52)

Change history (0)

No recorded changes yet.

Sources
CVE.org / MITRE
Status PUBLISHED
Assigner apache
Published Jul 13, 2017
Updated Sep 16, 2024
Reserved Jun 21, 2017
Link CVE-2017-9788
CISA Vulnrichment
Updated n/a
NVD
Status Modified
Modified Jun 17, 2026
Link CVE-2017-9788
Red Hat
Severity Important
Public date Jul 11, 2017
Links CVE-2017-9788 - Bugzilla