sshd.c in OpenSSH 3.6.1p2 and 3.7.1p2 and possibly other versions, when using privilege separation, does not properly signal the non-privileged process when a session has been terminated after exceeding the LoginGraceTime setting, which leaves the connection open and allows remote attackers to cause a denial of service (connection consumption).
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11541
https://exchange.xforce.ibmcloud.com/vulnerabilities/20930
http://www.vupen.com/english/advisories/2006/4502
http://www.vmware.com/support/vi3/doc/esx-9986131-patch.html
http://www.vmware.com/support/vi3/doc/esx-3069097-patch.html
http://www.vmware.com/download/esx/esx-213-200610-patch.html
http://www.vmware.com/download/esx/esx-202-200610-patch.html
http://www.securityfocus.com/bid/14963
http://www.securityfocus.com/archive/1/451426/100/200/threaded
http://www.securityfocus.com/archive/1/451417/100/200/threaded
http://www.securityfocus.com/archive/1/451404/100/0/threaded
http://www.securityfocus.com/archive/1/425397/100/0/threaded
http://support.avaya.com/elmodocs2/security/ASA-2005-223.pdf
http://support.avaya.com/elmodocs2/security/ASA-2005-216.pdf
http://secunia.com/advisories/23680
http://secunia.com/advisories/22875
http://secunia.com/advisories/17252
http://secunia.com/advisories/17135
http://secunia.com/advisories/17000
http://rhn.redhat.com/errata/RHSA-2005-550.html