CESA-2004:245: apache, mod_ssl security update

Description

Updated httpd and mod_ssl packages that fix minor security issues in the Apache Web server are now available for CentOS Linux 2.1.

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 CentOS Linux platforms CentOS 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. CentOS 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.