Pluggable Authentication Modules provide a system whereby administrators can set up authentication policies without having to recompile programs that handle authentication. It was discovered that the pam_namespace module executed the external script namespace.init with an unchanged environment inherited from an application calling PAM. In cases where such an environment was untrusted , a local, unprivileged user could possibly use this flaw to escalate their privileges. It was discovered that the pam_mail module used root privileges while accessing users" files. In certain configurations, a local, unprivileged user could use this flaw to obtain limited information about files or directories that they do not have access to. It was discovered that the pam_xauth module did not verify the return values of the setuid and setgid system calls. A local, unprivileged user could use this flaw to execute the xauth command with root privileges and make it read an arbitrary input file. Red Hat would like to thank Sebastian Krahmer of the SuSE Security Team for reporting the CVE-2010-3435 issue. All pam users should upgrade to these updated packages, which contain backported patches to correct these issues.