National Cyber Awareness System

Vulnerability Summary for CVE-2011-1473

Overview

** 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.

Impact

CVSS Severity (version 2.0):

CVSS Version 2 Metrics:

References to Advisories, Solutions, and Tools

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External Source: MISC

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

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

External Source: MLIST

Name: [oss-security] 20110708 SSL renegotiation DoS CVE-2011-1473

Hyperlink:http://www.openwall.com/lists/oss-security/2011/07/08/2

External Source: MLIST

Name: [tls] 20110318 Re: SSL Renegotiation DOS

Hyperlink:http://www.ietf.org/mail-archive/web/tls/current/msg07577.html

External Source: MLIST

Name: [tls] 20110318 Re: SSL Renegotiation DOS

Hyperlink:http://www.ietf.org/mail-archive/web/tls/current/msg07576.html

External Source: MLIST

Name: [tls] 20110315 Re: SSL Renegotiation DOS

Hyperlink:http://www.ietf.org/mail-archive/web/tls/current/msg07567.html

External Source: MLIST

Name: [tls] 20110315 Re: SSL Renegotiation DOS

Hyperlink:http://www.ietf.org/mail-archive/web/tls/current/msg07564.html

External Source: MLIST

Name: [tls] 20110315 SSL Renegotiation DOS

Hyperlink:http://www.ietf.org/mail-archive/web/tls/current/msg07553.html

External Source: MISC

Name: http://www.educatedguesswork.org/2011/10/ssltls_and_computational_dos.html

Hyperlink:http://www.educatedguesswork.org/2011/10/ssltls_and_computational_dos.html

External Source: MISC

Name: http://vincent.bernat.im/en/blog/2011-ssl-dos-mitigation.html

Hyperlink:http://vincent.bernat.im/en/blog/2011-ssl-dos-mitigation.html

External Source: MISC

Name: http://orchilles.com/2011/03/ssl-renegotiation-dos.html

Hyperlink:http://orchilles.com/2011/03/ssl-renegotiation-dos.html