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Category:   Application (Generic)  >   Java Runtime Environment (JRE) Vendors:   Sun
(Sun Issues Fix for Java) OpenSSL RSA Signatures Can Be Forged
SecurityTracker Alert ID:  1016969
SecurityTracker URL:
CVE Reference:   CVE-2006-4339   (Links to External Site)
Date:  Oct 3 2006
Impact:   Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to JRE 5.0 Update 9
Description:   A vulnerability was reported in OpenSSL. A remote user may be able to forge certain digital signatures. Sun JRE is affected.

If an RSA key with exponent 3 is used, a remote user may be able to forge a PKCS #1 v1.5 signature for that key.

Software that uses PKCS #1 v1.5 may be affected. Software that uses OpenSSL to verify X.509 certificates may also be affected.

Daniel Bleichenbacher reported the type of attack that is possible against PKCS #1 v1.5 signatures.

Impact:   A remote user may be able to forge signatures (and certificates).
Solution:   Sun has issued a fix for JRE, which is affected by the OpenSSL vulnerability. The fix available at:

* JDK and JRE 5.0 Update 9 and later (for Windows, Solaris, and Linux)

A fix for SDK and JRE 1.4.2 and 1.3.1, and for JSSE 1.0.3, will be issued in upcoming update releases.

The Sun advisory is available at:

[Editor's note: Sun reports that several other Sun products are affected and that separate Sun Alerts will be issued for each affected product.]

Vendor URL: (Links to External Site)
Cause:   Authentication error
Underlying OS:   Linux (Any), UNIX (Solaris - SunOS), Windows (Any)

Message History:   This archive entry is a follow-up to the message listed below.
Sep 5 2006 OpenSSL RSA Signatures Can Be Forged

 Source Message Contents

Date:  Mon, 2 Oct 2006 23:38:56 -0400
Subject:  Security Vulnerability in RSA Signature Verification Impacting Multiple SUN Products


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