CVE-2011-5094

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

4.3

CVSS

Severity: Medium

CVSS 2.0 •

EPSS 0.55%

Affected: n/a n/a

References

Link	Tags
http://vincent.bernat.im/en/blog/2011-ssl-dos-mitigation.html
http://www.ietf.org/mail-archive/web/tls/current/msg07567.html	mailing list
http://www.ietf.org/mail-archive/web/tls/current/msg07577.html	mailing list
https://bugzilla.redhat.com/show_bug.cgi?id=707065
http://www.educatedguesswork.org/2011/10/ssltls_and_computational_dos.html
http://www.openwall.com/lists/oss-security/2011/07/08/2	mailing list
http://www.ietf.org/mail-archive/web/tls/current/msg07576.html	mailing list
http://orchilles.com/2011/03/ssl-renegotiation-dos.html
http://www.ietf.org/mail-archive/web/tls/current/msg07553.html	mailing list
http://www.ietf.org/mail-archive/web/tls/current/msg07564.html	mailing list

Frequently Asked Questions

What is the severity of CVE-2011-5094?: CVE-2011-5094 has been scored as a medium severity vulnerability.
How to fix CVE-2011-5094?: To fix CVE-2011-5094, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2011-5094 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2011-5094 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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