GLSA-200409-21 : Apache 2, mod_dav: Multiple vulnerabilities
Medium Nessus Plugin ID 14766
SynopsisThe remote Gentoo host is missing one or more security-related patches.
DescriptionThe remote host is affected by the vulnerability described in GLSA-200409-21 (Apache 2, mod_dav: Multiple vulnerabilities)
A potential infinite loop has been found in the input filter of mod_ssl (CAN-2004-0748) as well as a possible segmentation fault in the char_buffer_read function if reverse proxying to a SSL server is being used (CAN-2004-0751). Furthermore, mod_dav, as shipped in Apache httpd 2 or mod_dav 1.0.x for Apache 1.3, contains a NULL pointer dereference which can be triggered remotely (CAN-2004-0809). The third issue is an input validation error found in the IPv6 URI parsing routines within the apr-util library (CAN-2004-0786). Additionally a possible buffer overflow has been reported when expanding environment variables during the parsing of configuration files (CAN-2004-0747).
A remote attacker could cause a Denial of Service either by aborting a SSL connection in a special way, resulting in CPU consumption, by exploiting the segmentation fault in mod_ssl or the mod_dav flaw. A remote attacker could also crash a httpd child process by sending a specially crafted URI.
The last vulnerability could be used by a local user to gain the privileges of a httpd child, if the server parses a carefully prepared .htaccess file.
There is no known workaround at this time.
SolutionAll Apache 2 users should upgrade to the latest version:
# emerge sync # emerge -pv '>=www-servers/apache-2.0.51' # emerge '>=www-servers/apache-2.0.51' All mod_dav users should upgrade to the latest version:
# emerge sync # emerge -pv '>=net-www/mod_dav-1.0.3-r2' # emerge '>=net-www/mod_dav-1.0.3-r2'