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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.
Vulnerability Assessment Details
Apache 2, mod_dav: Multiple vulnerabilities
Detailed Explanation for this Vulnerability Assessment
The 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
(CVE-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
(CVE-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 (CVE-2004-0809). The third issue is an input
validation error found in the IPv6 URI parsing routines within the apr-util
library (CVE-2004-0786). Additionally a possible buffer overflow has been
reported when expanding environment variables during the parsing of
configuration files (CVE-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 vulnerabilty could be used by a local user to gain the rights
of a httpd child, if the server parses a carefully prepared .htaccess file.
There is no known workaround at this time.
All Apache 2 users should upgrade to the latest version:
# emerge sync
# emerge -pv ">=net-www/apache-2.0.51"
# emerge ">=net-www/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"
Network Security Threat Level: Medium
Networks Security ID:
Vulnerability Assessment Copyright: (C) 2005 Michel Arboi
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