Updated cyrus-sasl packages that fix a setuid and setgid application vulnerability are now available. [Updated 7th October 2004] Revised cryus-sasl packages have been added for CentOS Linux 3; the patch in the previous packages broke interaction with ldap.
The cyrus-sasl package contains the Cyrus implementation of SASL. SASL is the Simple Authentication and Security Layer, a method for adding authentication support to connection-based protocols. At application startup, libsasl and libsasl2 attempts to build a list of all available SASL plug-ins which are available on the system. To do so, the libraries search for and attempt to load every shared library found within the plug-in directory. This location can be set with the SASL_PATH environment variable. In situations where an untrusted local user can affect the environment of a privileged process, this behavior could be exploited to run arbitrary code with the privileges of a setuid or setgid application. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2004-0884 to this issue. Users of cyrus-sasl should upgrade to these updated packages, which contain backported patches and are not vulnerable to this issue.