CVE-2011-1473

Published: 16 June 2012

** DISPUTED ** OpenSSL before 0.9.8l, and 0.9.8m through 1.x, 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-2011-5094. 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

Protocol issue. Nothing to be done at this time. Marking low
because while renegotiation makes the DoS faster, standard DoS methods
still apply for SSL servers that need to setup the SSL connection.
per Redhat, should not affect httpd/mod_ssl

this CVE is specific to openssl, nss is in CVE-2011-5094
we're not going to fix this, since it's disputed

Status

References

• http://orchilles.com/2011/03/ssl-renegotiation-dos.html
• http://www.ietf.org/mail-archive/web/tls/current/msg07553.html
• http://www.nessus.org/plugins/index.php?view=single&id=53491
• http://www.educatedguesswork.org/2011/10/ssltls_and_computational_dos.html
• http://vincent.bernat.im/en/blog/2011-ssl-dos-mitigation.html
• https://www.cve.org/CVERecord?id=CVE-2011-1473
• NVD
• Launchpad
• Debian

Bugs

• https://bugzilla.redhat.com/show_bug.cgi?id=707065