Bug 117214

Summary:	Potential SSL 2.0 Rollback Vulnerability in openssl versions <0.9.7h and == 0.9.8
Product:	Gentoo Security	Reporter:	Carl P. Corliss <rabbitt>
Component:	Vulnerabilities	Assignee:	Gentoo Security <security>
Status:	RESOLVED DUPLICATE
Severity:	normal
Priority:	High
Version:	unspecified
Hardware:	All
OS:	Linux
URL:	http://www.openssl.org/news/secadv_20051011.txt
Whiteboard:
Package list:		Runtime testing required:	---

Description Carl P. Corliss 2005-12-30 08:53:46 UTC

(from the url)

A vulnerability has been found in all previously released versions of
OpenSSL (all versions up to 0.9.7h and 0.9.8a).  Versions 0.9.7h and
0.9.8a have been released to address the issue.  The vulnerability
potentially affects applications that use the SSL/TLS server
implementation provided by OpenSSL.

Such applications are affected if they use the option
SSL_OP_MSIE_SSLV2_RSA_PADDING.  This option is implied by use of
SSL_OP_ALL, which is intended to work around various bugs in
third-party software that might prevent interoperability.  The
SSL_OP_MSIE_SSLV2_RSA_PADDING option disables a verification step in
the SSL 2.0 server supposed to prevent active protocol-version
rollback attacks.  With this verification step disabled, an attacker
acting as a "man in the middle" can force a client and a server to
negotiate the SSL 2.0 protocol even if these parties both support SSL
3.0 or TLS 1.0.  The SSL 2.0 protocol is known to have severe
cryptographic weaknesses and is supported as a fallback only.

Applications using neither SSL_OP_MSIE_SSLV2_RSA_PADDING nor
SSL_OP_ALL are not affected.  Also, applications that disable
use of SSL 2.0 are not affected.

The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CAN-2005-2969 to this issue.

Comment 1 Sune Kloppenborg Jeppesen (RETIRED) gentoo-dev

2005-12-30 10:58:25 UTC


*** This bug has been marked as a duplicate of 108852 ***