APR Utility Library: Multiple vulnerabilities

Background

The Apache Portable Runtime Utility Library (aka apr-util) provides an interface to functionality such as XML parsing, string matching and databases connections.

Description

Multiple vulnerabilities have been discovered in the APR Utility Library:

• Matthew Palmer reported a heap-based buffer underflow while compiling search patterns in the apr_strmatch_precompile() function in strmatch/apr_strmatch.c (CVE-2009-0023).
• kcope reported that the expat XML parser in xml/apr_xml.c does not limit the amount of XML entities expanded recursively (CVE-2009-1955).
• C. Michael Pilato reported an off-by-one error in the apr_brigade_vprintf() function in buckets/apr_brigade.c (CVE-2009-1956).

Impact

A remote attacker could exploit these vulnerabilities to cause a Denial of Service (crash or memory exhaustion) via an Apache HTTP server running mod_dav or mod_dav_svn, or using several configuration files. Additionally, a remote attacker could disclose sensitive information or cause a Denial of Service by sending a specially crafted input. NOTE: Only big-endian architectures such as PPC and HPPA are affected by the latter flaw.

Workaround

There is no known workaround at this time.

Resolution

All Apache Portable Runtime Utility Library users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=dev-libs/apr-util-1.3.7"