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).
http://marc.info/?l=openssh-unix-dev&m=107520317020444&w=2
http://marc.info/?l=openssh-unix-dev&m=107529205602320&w=2
http://rhn.redhat.com/errata/RHSA-2005-550.html
http://secunia.com/advisories/17000
http://secunia.com/advisories/17135
http://secunia.com/advisories/17252
http://secunia.com/advisories/22875
http://secunia.com/advisories/23680
https://exchange.xforce.ibmcloud.com/vulnerabilities/20930
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11541
http://support.avaya.com/elmodocs2/security/ASA-2005-216.pdf
http://support.avaya.com/elmodocs2/security/ASA-2005-223.pdf
http://www.vmware.com/download/esx/esx-202-200610-patch.html
http://www.vmware.com/download/esx/esx-213-200610-patch.html
http://www.vmware.com/support/vi3/doc/esx-3069097-patch.html
http://www.vmware.com/support/vi3/doc/esx-9986131-patch.html