pam is vulnerable to denial of service (DoS) attacks. The vulnerability exists as the _unix_run_helper_binary
function in the pam_unix module in Linux-PAM (aka pam) before 1.2.1, when unable to directly access passwords, allows local users to enumerate usernames or cause a denial of service (hang) via a large password.
lists.fedoraproject.org/pipermail/package-announce/2015-July/161350.html
lists.fedoraproject.org/pipermail/package-announce/2015-June/161249.html
rhn.redhat.com/errata/RHSA-2015-1640.html
www.openwall.com/lists/oss-security/2015/06/25/13
www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html
www.securityfocus.com/bid/75428
www.ubuntu.com/usn/USN-2935-1
www.ubuntu.com/usn/USN-2935-2
www.ubuntu.com/usn/USN-2935-3
access.redhat.com/errata/RHSA-2015:1640
access.redhat.com/security/cve/CVE-2015-3238
access.redhat.com/security/updates/classification/#moderate
bugzilla.redhat.com/show_bug.cgi?id=1228571
rhn.redhat.com/errata/RHSA-2015-1640.html
security.gentoo.org/glsa/201605-05
www.trustwave.com/Resources/Security-Advisories/Advisories/TWSL2015-011/?fid=6551
www.trustwave.com/Resources/SpiderLabs-Blog/Username-Enumeration-against-OpenSSH-SELinux-with-CVE-2015-3238/