Test ID:	1.3.6.1.4.1.25623.1.0.117761
Category:	SSL and TLS
Title:	SSL/TLS: Renegotiation DoS Vulnerability (CVE-2011-1473, CVE-2011-5094)
Summary:	The remote SSL/TLS service is prone to a denial of service (DoS); vulnerability.
Description:	Summary: The remote SSL/TLS service is prone to a denial of service (DoS) vulnerability. Vulnerability Insight: The flaw exists because the remote SSL/TLS service does not properly restrict client-initiated renegotiation within the SSL and TLS protocols. Note: The referenced CVEs are affecting OpenSSL and Mozilla Network Security Services (NSS) but both are in a DISPUTED state with the following rationale: > 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. Both CVEs are still kept in this VT as a reference to the origin of this flaw. Vulnerability Impact: The flaw might make it easier for remote attackers to cause a DoS (CPU consumption) by performing many renegotiations within a single connection. Affected Software/OS: Every SSL/TLS service which does not properly restrict client-initiated renegotiation. Solution: Users should contact their vendors for specific patch information. A general solution is to remove/disable renegotiation capabilities altogether from/in the affected SSL/TLS service. CVSS Score: 5.0 CVSS Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2011-1473 Bugtraq: 20140214 ESA-2014-009: RSA BSAFE SSL-J Multiple Vulnerabilities (Google Search) http://archives.neohapsis.com/archives/bugtraq/2014-02/0061.html HPdes Security Advisory: HPSBMU02776 http://marc.info/?l=bugtraq&m=133951357207000&w=2 HPdes Security Advisory: SSRT100852 http://orchilles.com/2011/03/ssl-renegotiation-dos.html http://vincent.bernat.im/en/blog/2011-ssl-dos-mitigation.html http://www.educatedguesswork.org/2011/10/ssltls_and_computational_dos.html https://bugzilla.redhat.com/show_bug.cgi?id=707065 http://www.openwall.com/lists/oss-security/2011/07/08/2 https://lists.apache.org/thread.html/r3822ad69442291562c2ab41132fc49780d269e8b52deb458b7060f6d@%3Ccommits.rocketmq.apache.org%3E https://lists.apache.org/thread.html/142b93d261e8ac7c5ceffdce848d622404abc1c286bbc999f43a9e10@%3Cdev.rocketmq.apache.org%3E https://lists.apache.org/thread.html/6121becfdd23f9aeb675d5db80616536277d5931d6cde9dca292e509@%3Cdev.rocketmq.apache.org%3E https://lists.apache.org/thread.html/8be38d35654441140db8eb3f7433524b3653ac3fdc26e2fa94626a3a@%3Cdev.rocketmq.apache.org%3E https://lists.apache.org/thread.html/r1e33410bb5c81536e7fe14b51fa83e7bfd9445db61fd10c134792bde@%3Cdev.rocketmq.apache.org%3E https://lists.apache.org/thread.html/r77fe575893261889b983e067293be72fa1f8c6305ede9fdbc404c514@%3Cdev.rocketmq.apache.org%3E https://lists.apache.org/thread.html/r298a09a2b98446b27217d719e877c643b6d13fac0bcafe04696a446b@%3Cdev.rocketmq.apache.org%3E https://lists.apache.org/thread.html/ra95c355827b3c96c8013ed8e0666c851581651be2524f3d28cd4fe71@%3Cdev.rocketmq.apache.org%3E https://lists.apache.org/thread.html/r5e595b91f00613dafa635852121d45b161e8b5c3eba4551aeccc6483@%3Cdev.rocketmq.apache.org%3E https://lists.apache.org/thread.html/r8680f41bcdad13c3f267cb868b45e5fb1f57df8b39d25193f7d66500@%3Cdev.rocketmq.apache.org%3E https://lists.apache.org/thread.html/r13a07a09f98b2841193dbf17a47c7f09b464e0747a1d3e7298ad4c81@%3Cdev.rocketmq.apache.org%3E https://lists.apache.org/thread.html/rf9e8ae0356af3ec4f7780ca651b770721d287d4d55f62f4f754e0a6f@%3Cdev.rocketmq.apache.org%3E https://lists.apache.org/thread.html/rc98eaa3f8223ac75aa5969f717954d8cbc9f3a9d8b7a6156a54fa557@%3Cdev.rocketmq.apache.org%3E http://www.ietf.org/mail-archive/web/tls/current/msg07564.html http://www.ietf.org/mail-archive/web/tls/current/msg07567.html http://www.ietf.org/mail-archive/web/tls/current/msg07553.html http://www.ietf.org/mail-archive/web/tls/current/msg07576.html http://www.ietf.org/mail-archive/web/tls/current/msg07577.html Common Vulnerability Exposure (CVE) ID: CVE-2011-5094
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