(Sun Issues Fix) GnuTLS May Allow Digital Signatures to Be Forged
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SecurityTracker Alert ID: 1018280 |
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SecurityTracker URL: http://securitytracker.com/id/1018280
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CVE Reference:
CVE-2006-4790
(Links to External Site)
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Date: Jun 22 2007
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Impact:
Modification of user information
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): prior to 1.4.4
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Description:
A vulnerability was reported in GnuTLS. A remote user may be able to forge certain digital signatures.
In certain cases, a remote user may be able to forge a PKCS #1 v1.5 signature for a key.
This can be achieved using a variation of Bleichenbacher's attack, but using the 'digestAlgorithm.parameters' field to store excess data.
This variation was reported Yutaka Oiwa, Kazukuni Kobara, and Hajime Watanabe.
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Impact:
A remote user may be able to forge signatures (and certificates).
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Solution:
Sun has issued the following fixes.
SPARC Platform
* Solaris 10 with patch 123938-01 or later
x86 Platform
* Solaris 10 with patch 123939-01 or later
The Sun advisory is available at:
http://sunsolve.sun.com/search/document.do?assetkey=1-26-102970-1
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Vendor URL: lists.gnupg.org/pipermail/gnutls-dev/2006-September/001205.html (Links to External Site)
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Cause:
Authentication error
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Underlying OS:
UNIX (Solaris - SunOS)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Fri, 22 Jun 2007 00:46:03 -0400
Subject: Security Vulnerability in RSA Signature Verification Affects GnuTLS Library Versions Prior to 1.4.4
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http://sunsolve.sun.com/search/document.do?assetkey=1-26-102970-1
CVE-2006-4790
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