CVE-2009-1956

Error de superación de límite (off-by-one) en la función apr_brigade_vprintf de Apache APR-util anterior a v1.3.5 en plataformas big-endian, permite a atacantes remotos obtener información sensible o provocar una denegación de servicio (caída de la aplicación) a través de una entrada manipulada.

Matthew Palmer discovered an underflow flaw in apr-util. An attacker could cause a denial of service via application crash in Apache using a crafted SVNMasterURI directive, .htaccess file, or when using mod_apreq2. Applications using libapreq2 are also affected. It was discovered that the XML parser did not properly handle entity expansion. A remote attacker could cause a denial of service via memory resource consumption by sending a crafted request to an Apache server configured to use mod_dav or mod_dav_svn. C. Michael Pilato discovered an off-by-one buffer overflow in apr-util when formatting certain strings. For big-endian machines (powerpc, hppa and sparc in Ubuntu), a remote attacker could cause a denial of service or information disclosure leak. All other architectures for Ubuntu are not considered to be at risk.