Check Point Advisories

Preemptive Protection against TLS and SSL Spoofing Vulnerability

Check Point Reference: CPAI-2010-020
Date Published: 9 Feb 2010
Severity: High
Last Updated: 10 Aug 2010
Source: Microsoft Security Advisory (977377)
Microsoft Security Bulletin MS10-049
Industry Reference:CVE-2009-3555
Protection Provided by:
Who is Vulnerable? Microsoft Windows 2000 SP4
Windows XP SP2
Windows XP SP3
Windows XP Professional x64 Edition SP2
Windows Server 2003 SP2
Windows Server 2003 x64 Edition SP2
Windows Server 2003 with SP2 (Itanium)
Windows Vista
Windows Vista SP1
Windows Vista SP2
Windows Vista x64 Edition
Windows Vista x64 Edition SP1
Windows Vista x64 Edition SP2
Windows Server 2008 for 32-bit Systems
Windows Server 2008 for 32-bit Systems SP2
Windows Server 2008 for x64-based Systems
Windows Server 2008 for x64-based Systems SP2
Windows Server 2008 (Itanium)
Windows Server 2008 (Itanium) SP2
Windows 7 for 32-bit Systems
Windows 7 for x64-based Systems
Windows Server 2008 R2 for x64-based Systems
Windows Server 2008 R2 (Itanium)
Vulnerability Description Transport Layer Security (TLS) and Secure Sockets Layer (SSL) are cryptographic protocols that provide security for communications over networks. TLS and SSL encrypt the segments of network connections at the Transport Layer end-to-end.
A spoofing vulnerability exists in multiple implementations of these protocols. The TLS and SSL protocols fail to properly associate renegotiation handshakes with an existing connection, which allows man-in-the-middle attackers to insert data into HTTPS sessions, and possibly other types of sessions protected by TLS or SSL. A remote attacker can leverage this vulnerability to execute an HTTP transaction authenticated by a legitimate user.
Vulnerability DetailsThe vulnerability is due to the flaw in the renegotiation aspect of the TLS protocol. A remote attacker may exploit this issue by sending an unauthenticated request that is processed retroactively by a server in a post-renegotiation context. Successful exploitation of this issue may allow the attacker to execute a man-in-the-middle attack.

Protection Overview

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