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Last updated: 2/13/2016 6:39:49 PM

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National Cyber Awareness System

Vulnerability Summary for CVE-2011-5094

Original release date: 06/16/2012
Last revised: 06/18/2012


** 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.


CVSS Severity (version 2.0):
CVSS v2 Base Score: 4.3 MEDIUM
Impact Subscore: 2.9
Exploitability Subscore: 8.6
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type: Allows disruption of service

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External Source: MISC
Name: https://bugzilla.redhat.com/show_bug.cgi?id=707065
External Source: MLIST
Name: [oss-security] 20110708 SSL renegotiation DoS CVE-2011-1473
External Source: MLIST
Name: [tls] 20110315 Re: SSL Renegotiation DOS
External Source: MLIST
Name: [tls] 20110315 Re: SSL Renegotiation DOS
External Source: MISC
Name: http://vincent.bernat.im/en/blog/2011-ssl-dos-mitigation.html
External Source: MLIST
Name: [tls] 20110315 SSL Renegotiation DOS
External Source: MISC
Name: http://www.educatedguesswork.org/2011/10/ssltls_and_computational_dos.html
External Source: MLIST
Name: [tls] 20110318 Re: SSL Renegotiation DOS
External Source: MLIST
Name: [tls] 20110318 Re: SSL Renegotiation DOS
External Source: MISC
Name: http://orchilles.com/2011/03/ssl-renegotiation-dos.html

Technical Details

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