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Bug 117214 - Potential SSL 2.0 Rollback Vulnerability in openssl versions <0.9.7h and == 0.9.8
Summary: Potential SSL 2.0 Rollback Vulnerability in openssl versions <0.9.7h and == 0...
Status: RESOLVED DUPLICATE of bug 108852
Alias: None
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: High normal (vote)
Assignee: Gentoo Security
Depends on:
Reported: 2005-12-30 08:53 UTC by Carl P. Corliss
Modified: 2005-12-30 10:58 UTC (History)
0 users

See Also:
Package list:
Runtime testing required: ---


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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 ( 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 ***