TLS - Renegotiation. CVE-2009-3555 . remote exploit for Multiple platform
Our webserver has recently failed a PCI compliance test due to existence of "TLS Session Renegotiation Vulnerability" (CVE-2009-3555) However I'm not sure whether those results are right. We're using nginx version 1.6.2, with openssl version 1.0.2. As far as I know any kind of renegotiation is disabled in nginx since version 0.8.23. Aug 26, 2016 · Renegotiation is required when no client-server authentication is initially required while making an SSL connection but is required later. Thus instead of dropping and creating a new SSL connection, renegotiation adds authentication details to the current connection. Renegotiation is used by ecommerce apps, cloud providers, and others. Jun 11, 2013 · The Common Vulnerabilities and Exposures (CVE) database outlines the details behind this SSL renegotiation vulnerability in CVE-2009-3555. You can read the details for yourself, but here's what the CVE basically says: TLS and SSLv3 do not properly associate renegotiation handshakes with an existing connection, and this allows attackers to Jun 11, 2010 · The vulnerability in the transport layer security protocol allows man-in-the-middle attackers to surreptitiously introduce text at the beginning of an SSL session. The TLS Handshake TLS has a handshake protocol that performs authentication, negotiates cryptographic parameters and generates a session key, called a bulk encryption key in TLS-speak.
This is a vulnerability coming up for multiple printers ranging from M series to P series printers (various models). Some models do have the "wizard" where you can basically disable certain TLS versions but even with those, I don't think has any options to disable the renegotiation. 0 Betty0610
Nov 03, 2011 · Hi I have newly set up NetScaler VPX 1000, version NS9.3: Build 49.5.nc NS is used for load balancing 2 MS Exchange 2010 CAS servers. Both servers and Netscaler LB Vserver use same SSL sertificates, and everything seems to work fine so far. Now I have got warning from my security team that there Nov 10, 2009 · TLS renegotiation vulnerability (CVE-2009-3555) This is about right if one considers the way an attacker injects data in the TLS session (in red) according to One way to fix the renegotiation vulnerability for SSLv3 is to completely disable renegotiation on the server side. As a permanent fix for the vulnerability, a renegotiation indication extension was proposed for TLS that will require the client and server to include and verify information about previous handshakes in any renegotiation handshakes.
The TLS protocol, and the SSL protocol 3.0 and possibly earlier, as used in Microsoft Internet Information Services (IIS) 7.0, mod_ssl in the Apache HTTP Server 2.2.14 and earlier, OpenSSL before 0.9.8l, GnuTLS 2.8.5 and earlier, Mozilla Network Security Services (NSS) 3.12.4 and earlier, multiple Cisco products, and other products, does not properly associate renegotiation handshakes with an existing connection, which allows man-in-the-middle attackers to insert data into HTTPS sessions
This option was introduced as a workaround to a security vulnerability in Transport Layer Security (TLS) and Secure Sockets Layer (SSL) protocols as mentioned in Citrix security bulletin CTX123359 - Transport Layer Security Renegotiation Vulnerability.