The recent APR Debian update DSA-2237-1 introduced a regression that could lead to an endless loop in the apr_fnmatch() function, causing a denial of service.

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Debian Security Advisory DSA-2237-2 security@debian.org
http://www.debian.org/security/ Stefan Fritsch
May 21, 2011 http://www.debian.org/security/faq
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Package : apr
Vulnerability : denial of service
Problem type : remote
Debian-specific: no
CVE ID : CVE-2011-0419 CVE-2011-1928
Debian bug : 627182


The recent APR update DSA-2237-1 introduced a regression that could
lead to an endless loop in the apr_fnmatch() function, causing a
denial of service. This update fixes this problem (CVE-2011-1928).

For reference, the description of the original DSA, which fixed
CVE-2011-0419:

A flaw was found in the APR library, which could be exploited through
Apache HTTPD's mod_autoindex. If a directory indexed by mod_autoindex
contained files with sufficiently long names, a remote attacker could
send a carefully crafted request which would cause excessive CPU
usage. This could be used in a denial of service attack.


For the oldstable distribution (lenny), this problem has been fixed in
version 1.2.12-5+lenny4.

For the stable distribution (squeeze), this problem has been fixed in
version 1.4.2-6+squeeze2.

For the testing distribution (wheezy), this problem will be fixed in
version 1.4.5-1.

For the unstable distribution (sid), this problem will be fixed in
version 1.4.5-1.

We recommend that you upgrade your apr packages and restart the
apache2 server.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/