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CVE-2011-5094

4.3 · MEDIUM

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…

Published Jun 16, 2012mozillaEPSS 2.70%

Overview

CVE-2011-5094 is a medium-severity vulnerability affecting mozilla network_security_services. It was published on June 16, 2012 and has a CVSS 2.0 base score of 4.3 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

Remediation

Check the references section for vendor advisories and patches from mozilla. Update network_security_services to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Reforchilles.com/2011/03/ssl-renegotiation-dos.htmlRefvincent.bernat.im/en/blog/2011-ssl-dos-mitigation.htmlRefwww.educatedguesswork.org/2011/10/ssltls_and_computational_dos.htmlRefwww.ietf.org/mail-archive/web/tls/current/msg07553.htmlRefwww.ietf.org/mail-archive/web/tls/current/msg07564.htmlRefwww.ietf.org/mail-archive/web/tls/current/msg07567.htmlRefwww.ietf.org/mail-archive/web/tls/current/msg07576.htmlRefwww.ietf.org/mail-archive/web/tls/current/msg07577.htmlRefwww.openwall.com/lists/oss-security/2011/07/08/2Refbugzilla.redhat.com/show_bug.cgi?id=707065

How CyberStrike helps

Frequently asked questions

What is CVE-2011-5094?

CVE-2011-5094 is a medium-severity vulnerability affecting mozilla network_security_services. It was published on June 16, 2012 and has a CVSS 2.0 base score of 4.3 (MEDIUM).

How severe is CVE-2011-5094?

This vulnerability has a CVSS 2.0 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2011-5094?

Check the references section for vendor advisories and patches from mozilla. Update network_security_services to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2011-5094?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2011-5094 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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