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[ GLSA 200510-11 ] OpenSSL: SSL 2.0 protocol rollback
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GLSA
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PostPosted: Wed Oct 12, 2005 12:06 pm    Post subject: [ GLSA 200510-11 ] OpenSSL: SSL 2.0 protocol rollback Reply with quote

Gentoo Linux Security Advisory

Title: OpenSSL: SSL 2.0 protocol rollback (GLSA 200510-11)
Severity: low
Exploitable: remote
Date: October 12, 2005
Updated: November 07, 2005
Bug(s): #108852
ID: 200510-11

Synopsis

When using a specific option, OpenSSL can be forced to fallback to the less secure SSL 2.0 protocol.

Background

OpenSSL is a toolkit implementing the Secure Sockets Layer, Transport Layer Security protocols and a general-purpose cryptography library.

Affected Packages

Package: dev-libs/openssl
Vulnerable: < 0.9.7h
Unaffected: >= 0.9.7h
Unaffected: >= 0.9.7g-r1 < 0.9.8
Unaffected: >= 0.9.7e-r2 < 0.9.8
Architectures: All supported architectures


Description

Applications setting the SSL_OP_MSIE_SSLV2_RSA_PADDING option (or the SSL_OP_ALL option, that implies it) can be forced by a third-party to fallback to the less secure SSL 2.0 protocol, even if both parties support the more secure SSL 3.0 or TLS 1.0 protocols.

Impact

A man-in-the-middle attacker can weaken the encryption used to communicate between two parties, potentially revealing sensitive information.

Workaround

If possible, disable the use of SSL 2.0 in all OpenSSL-enabled applications.

Resolution

All OpenSSL users should upgrade to the latest version:
Code:
# emerge --sync
# emerge --ask --oneshot --verbose dev-libs/openssl


References

CAN-2005-2969
[url=http://www.openssl.org/news/secadv_20051011.txt ]OpenSSL security advisory[/url]


Last edited by GLSA on Sun May 07, 2006 4:59 pm; edited 1 time in total
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