=========================================================== Ubuntu Security Notice USN-177-1 September 07, 2005 apache2, libapache-mod-ssl vulnerabilities CAN-2005-2700, CAN-2005-2728 =========================================================== 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 libapache-mod-ssl The problem can be corrected by upgrading the affected package to version 2.0.50-12ubuntu4.8 (for Ubuntu 4.10), or 2.0.53-5ubuntu5.3 (for Ubuntu 5.04). In general, a standard system upgrade is sufficient to effect the necessary changes. Details follow: Apache did not honour the "SSLVerifyClient require" directive within a block if the surrounding block contained a directive "SSLVerifyClient optional". This allowed clients to bypass client certificate validation on servers with the above configuration. (CAN-2005-2700) Filip Sneppe discovered a Denial of Service vulnerability in the byte range filter handler. By requesting certain large byte ranges, a remote attacker could cause memory exhaustion in the server. (CAN-2005-2728) The updated libapache-mod-ssl also fixes two older Denial of Service vulnerabilities: A format string error in the ssl_log() function which could be exploited to crash the server (CAN-2004-0700), and a flaw in the SSL cipher negotiation which could be exploited to terminate a session (CAN-2004-0885). Please note that Apache 1.3 and libapache-mod-ssl are not officially supported (they are in the "universe" component of the Ubuntu archive). Updated packages for Ubuntu 4.10 (Warty Warthog): Source archives: http://security.ubuntu.com/ubuntu/pool/main/a/apache2/apache2_2.0.50-12ubuntu4.8.diff.gz Size/MD5: 101542 107c0d44c3668596c431b922cef7108e http://security.ubuntu.com/ubuntu/pool/main/a/apache2/apache2_2.0.50-12ubuntu4.8.dsc Size/MD5: 1152 e46ab252f55b3cddca6eff7411e6310c http://security.ubuntu.com/ubuntu/pool/main/a/apache2/apache2_2.0.50.orig.tar.gz Size/MD5: 6321209 9d0767f8a1344229569fcd8272156f8b http://security.ubuntu.com/ubuntu/pool/universe/liba/libapache-mod-ssl/libapache-mod-ssl_2.8.18-1ubuntu1.diff.gz Size/MD5: 31850 278b1fcaebc9890ac6a667c5fe59adf2 http://security.ubuntu.com/ubuntu/pool/universe/liba/libapache-mod-ssl/libapache-mod-ssl_2.8.18-1ubuntu1.dsc Size/MD5: 779 007a277c901888314ed8e4990ff2af2d http://security.ubuntu.com/ubuntu/pool/universe/liba/libapache-mod-ssl/libapache-mod-ssl_2.8.18.orig.tar.gz Size/MD5: 754214 4e966d62bb9304fef153b03868756543 Architecture independent packages: http://security.ubuntu.com/ubuntu/pool/main/a/apache2/apache2-doc_2.0.50-12ubuntu4.8_all.deb Size/MD5: 3178708 565d44192bafdd109d63118e1d6d5b7a http://security.ubuntu.com/ubuntu/pool/main/a/apache2/apache2-prefork-dev_2.0.50-12ubuntu4.8_all.deb Size/MD5: 164190 0ec49ffa716a6445fabac9bc9d06a489 http://security.ubuntu.com/ubuntu/pool/main/a/apache2/apache2-threaded-dev_2.0.50-12ubuntu4.8_all.deb Size/MD5: 164948 b6a7d940115538ad527c550ae4ce8657 http://security.ubuntu.com/ubuntu/pool/universe/liba/libapache-mod-ssl/libapache-mod-ssl-doc_2.8.18-1ubuntu1_all.deb Size/MD5: 241864 0c99f46f47f35727dd196ea9eb05d321 amd64 architecture (Athlon64, Opteron, EM64T Xeon) http://security.ubuntu.com/ubuntu/pool/main/a/apache2/apache2-common_2.0.50-12ubuntu4.8_amd64.deb Size/MD5: 865078 4add6aaacd6cb4017181c8021c2cfa0f http://security.ubuntu.com/ubuntu/pool/main/a/apache2/apache2-mpm-perchild_2.0.50-12ubuntu4.8_amd64.deb Size/MD5: 230852 11820237e93e180e9f4e5c0e57ee6f2a 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