The GnuTLS library version prior to 1.4.4 is impacted by an RSA signature forgery vulnerability. This vulnerability, which affects applications which make use of the GnuTLS library to verify PKCS#1 signatures, allows a malicious user to make an altered PKCS#1 v1.5 signature appear to be correct thus forging the signature.

This issue is described in the following documents:

• GNUTLS-SA-2006-4 at: http://www.gnutls.org/security.html
• CVE-2006-4790 at: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4790

The issue described in this Sun Alert is specific to the GnuTLS library. Multiple Sun products are affected by this issue. For more details please see Sun Alert 102648 at:

• http://sunsolve.sun.com/search/document.do?assetkey=1-26-102648-1

Note: Evolution uses the GnuTLS library and is impacted by this issue.

This issue can occur in the following releases:

SPARC Platform

• Solaris 10 without patch 123938-01

x86 Platform

• Solaris 10 without patch 123939-01

Note 1: Solaris 8 and Solaris 9 are not impacted by this issue.

Note 2: This issue only impacts systems with SUNWgnutls installed. To determine if this package is installed run the following command:

    $ pkginfo SUNWgnutls
    EVO146      SUNWgnutls GNU Transport Layer Security Library

Note 3: This issue only affects the GnuTLS library versions prior to 1.4.4. To determine the version of the GnuTLS library on the system the following command can be run:

    $ pkginfo -l SUNWgnutls | grep VERSION
    VERSION:  0.9.5,REV=10.0.3.2004.12.15.17.59

Note 4: The Solaris 10 patches which address this issue do not increment the version of GnuTLS. The version of GnuTLS supplied with the patches will still be reported as 0.9.5.

There are no predictable symptoms that would indicate the described issue has been exploited.

There is no workaround for this issue.

This issue is addressed in the following releases:

SPARC Platform

• Solaris 10 with patch 123938-01 or later

x86 Platform

• Solaris 10 with patch 123939-01 or later

This solution has no attachment