The Apache Portable Runtime (APR) is a portability library used by theApache HTTP Server and other projects. It provides a free library of C datastructures and routines.The fix for CVE-2011-0419 (released via RHSA-2011:0507) introduced aninfinite loop flaw in the apr_fnmatch() function when the APR_FNM_PATHNAMEmatching flag was used. A remote attacker could possibly use this flaw tocause a denial of service on an application using the apr_fnmatch()function. (CVE-2011-1928)Note: This problem affected httpd configurations using the "Location"directive with wildcard URLs. The denial of service could have beentriggered during normal operation; it did not specifically require amalicious HTTP request.This update also addresses additional problems introduced by the rewrite ofthe apr_fnmatch() function, which was necessary to address theCVE-2011-0419 flaw.All apr users should upgrade to these updated packages, which contain abackported patch to correct this issue. Applications using the apr library,such as httpd, must be restarted for this update to take effect.