CentOS Errata and Security Advisory CESA-2005:800
OpenSSL is a toolkit that implements Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library.
OpenSSL contained a software work-around for a bug in SSL handling in Microsoft Internet Explorer version 3.0.2. This work-around is enabled in most servers that use OpenSSL to provide support for SSL and TLS. Yutaka Oiwa discovered that this work-around could allow an attacker, acting as a "man in the middle" to force an SSL connection to use SSL 2.0 rather than a stronger protocol such as SSL 3.0 or TLS 1.0. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2005-2969 to this issue.
A bug was also fixed in the way OpenSSL creates DSA signatures. A cache timing attack was fixed in RHSA-2005-476 which caused OpenSSL to do private key calculations with a fixed time window. The DSA fix for this was not complete and the calculations are not always performed within a fixed-window. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2005-0109 to this issue.
Users are advised to upgrade to these updated packages, which remove the MISE 3.0.2 work-around and contain patches to correct these issues.
Note: After installing this update, users are advised to either restart all services that use OpenSSL or restart their system.
Merged security bulletin from advisories: http://lists.centos.org/pipermail/centos-announce/2005-October/012263.html http://lists.centos.org/pipermail/centos-announce/2005-October/012266.html http://lists.centos.org/pipermail/centos-announce/2005-October/012273.html http://lists.centos.org/pipermail/centos-announce/2005-October/012274.html http://lists.centos.org/pipermail/centos-announce/2005-October/012278.html http://lists.centos.org/pipermail/centos-announce/2005-October/012285.html
Affected packages: openssl openssl-devel openssl-perl openssl096b
Upstream details at: https://rhn.redhat.com/errata/RHSA-2005-800.html