Updated Apache httpd packages to correct two security issues are now
available for CentOS Linux 3 and 4.
This update has been rated as having moderate security impact by the Red
Hat Security Response Team.
The Apache HTTP Server is a powerful, full-featured, efficient, and
freely-available Web server.
Watchfire reported a flaw that occured when using the Apache server as an
HTTP proxy. A remote attacker could send an HTTP request with both a
"Transfer-Encoding: chunked" header and a "Content-Length" header. This
caused Apache to incorrectly handle and forward the body of the request in
a way that the receiving server processes it as a separate HTTP request.
This could allow the bypass of Web application firewall protection or lead
to cross-site scripting (XSS) attacks. The Common Vulnerabilities and
Exposures project (cve.mitre.org) assigned the name CAN-2005-2088 to this
Marc Stern reported an off-by-one overflow in the mod_ssl CRL verification
callback. In order to exploit this issue the Apache server would need to
be configured to use a malicious certificate revocation list (CRL). The
Common Vulnerabilities and Exposures project (cve.mitre.org) assigned the
name CAN-2005-1268 to this issue.
Users of Apache httpd should update to these errata packages that contain
backported patches to correct these issues.