CVE-2011-5094

Published: 16 June 2012

** 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.

Notes

this CVE is specific to nss, openssl is in CVE-2011-1473
Upstream disputes this. Ignoring.

Status

References

• https://bugzilla.redhat.com/show_bug.cgi?id=707065
• http://www.openwall.com/lists/oss-security/2011/07/08/2
• http://www.ietf.org/mail-archive/web/tls/current/msg07577.html
• http://www.ietf.org/mail-archive/web/tls/current/msg07576.html
• http://www.ietf.org/mail-archive/web/tls/current/msg07567.html
• http://www.ietf.org/mail-archive/web/tls/current/msg07564.html
• http://www.ietf.org/mail-archive/web/tls/current/msg07553.html
• http://www.educatedguesswork.org/2011/10/ssltls_and_computational_dos.html
• http://vincent.bernat.im/en/blog/2011-ssl-dos-mitigation.html
• http://orchilles.com/2011/03/ssl-renegotiation-dos.html
• http://www.thc.org/thc-ssl-dos/
• https://www.cve.org/CVERecord?id=CVE-2011-5094
• NVD
• Launchpad
• Debian

Bugs

• https://bugzilla.redhat.com/show_bug.cgi?id=833118