(RHSA-2004:245) apache, mod_ssl security update

The Apache HTTP Server is a powerful, full-featured, efficient, and
freely-available Web server.

A buffer overflow was found in the Apache proxy module, mod_proxy, which
can be triggered by receiving an invalid Content-Length header. In order
to exploit this issue, an attacker would need an Apache installation
that was configured as a proxy to connect to a malicious site. This would
cause the Apache child processing the request to crash. The Common
Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name
CAN-2004-0492 to this issue.

On Red Hat Enterprise Linux platforms Red Hat believes this issue cannot
lead to remote code execution. This issue also does not represent a Denial
of Service attack as requests will continue to be handled by other Apache
child processes.

A stack buffer overflow was discovered in mod_ssl which can be triggered if
using the FakeBasicAuth option. If mod_ssl is sent a client certificate
with a subject DN field longer than 6000 characters, a stack overflow can
occur if FakeBasicAuth has been enabled. In order to exploit this issue
the carefully crafted malicious certificate would have to be signed by a
Certificate Authority which mod_ssl is configured to trust. The Common
Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name
CAN-2004-0488 to this issue.

This update also fixes a DNS handling bug in mod_proxy.

The mod_auth_digest module is now included in the Apache package and should
be used instead of mod_digest for sites requiring Digest authentication.

Red Hat Enterprise Linux 2.1 users of the Apache HTTP Server should upgrade
to these erratum packages, which contains Apache version 1.3.27 with
backported patches correcting these issues.