CVE-2011-5094 - Unchancy Hinge

Description

DISPUTED Mozilla Network Security Services (NSS) 3.x with certain settings of the SSL_ENABLE_RENEGOTIATION option does not properly restrict client-initiated renegotiation within the SSL and TLS protocols which might make it easier for remote attackers to cause a denial of service (CPU consumption) by performing many renegotiations within a single connection a different vulnerability than CVE-2011-1473. NOTE: it can also be argued that it is the responsibility of server deployments not a security library to prevent or limit renegotiation when it is inappropriate within a specific environment.

Reference

http://www.ietf.org/mail-archive/web/tls/current/msg07577.html http://www.ietf.org/mail-archive/web/tls/current/msg07567.html http://vincent.bernat.im/en/blog/2011-ssl-dos-mitigation.html http://www.ietf.org/mail-archive/web/tls/current/msg07576.html https://bugzilla.redhat.com/show_bug.cgi?id=707065 http://www.educatedguesswork.org/2011/10/ssltls_and_computational_dos.html http://orchilles.com/2011/03/ssl-renegotiation-dos.html http://www.ietf.org/mail-archive/web/tls/current/msg07564.html http://www.openwall.com/lists/oss-security/2011/07/08/2 http://www.ietf.org/mail-archive/web/tls/current/msg07553.html