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Cause: When using mod_authn_dbd with PostgreSQL, the password obtained from database has been used after it was freed already.
Consequence: In the mentioned configuration, httpd process could crash resulting in authentication fail.
Fix: The user-after-free bug in mod_authn_dbd has been fixed.
Result: mod_dbd_authn does not crash in the mentioned case and authentication works.
Created attachment 987697[details]
Reproducer
Description of problem:
When Apache is configured to authenticate over mod_dbd using a PostgreSQL database, the authentication attempts fail if the variable MALLOC_CHECK_ is not set (to a non-zero value) in /etc/sysconfig/httpd. When a line like 'MALLOC_CHECK_=2' is added to the file and httpd restarted, the authentication succeeds.
Steps to reproduce:
Extract the enclosed tarball and run reproducer.sh.
Version-Release number of selected component (if applicable):
httpd-2.4.6-31.el7
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHBA-2015-2194.html
Created attachment 987697 [details] Reproducer Description of problem: When Apache is configured to authenticate over mod_dbd using a PostgreSQL database, the authentication attempts fail if the variable MALLOC_CHECK_ is not set (to a non-zero value) in /etc/sysconfig/httpd. When a line like 'MALLOC_CHECK_=2' is added to the file and httpd restarted, the authentication succeeds. Steps to reproduce: Extract the enclosed tarball and run reproducer.sh. Version-Release number of selected component (if applicable): httpd-2.4.6-31.el7