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=========================================================== Ubuntu Security Notice USN-160-1 August 04, 2005 apache2 vulnerabilities CAN-2005-1268, CAN-2005-2088 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 4.10 (Warty Warthog) Ubuntu 5.04 (Hoary Hedgehog) The following packages are affected: apache2-mpm-perchild apache2-mpm-prefork apache2-mpm-threadpool apache2-mpm-worker The problem can be corrected by upgrading the affected package to version 2.0.50-12ubuntu4.3 (for Ubuntu 4.10), or 2.0.53-5ubuntu5.2 (for Ubuntu 5.04). In general, a standard system upgrade is sufficient to effect the necessary changes. Details follow: Marc Stern discovered a buffer overflow in the SSL module's certificate revocation list (CRL) handler. If Apache is configured to use a malicious CRL, this could possibly lead to a server crash or arbitrary code execution with the privileges of the Apache web server. (CAN-2005-1268) Watchfire discovered that Apache insufficiently verified the "Transfer-Encoding" and "Content-Length" headers when acting as an HTTP proxy. By sending a specially crafted HTTP request, a remote attacker who is authorized to use the proxy could exploit this to bypass web application firewalls, poison the HTTP proxy cache, and conduct cross-site scripting attacks against other proxy users. (CAN-2005-2088)