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Category:   Application (Security)  >   OpenSSL Vendors:
(OpenBSD Issues Fix) OpenSSL RSA Signatures Can Be Forged
SecurityTracker Alert ID:  1016820
SecurityTracker URL:
CVE Reference:   CVE-2006-4339   (Links to External Site)
Date:  Sep 9 2006
Impact:   Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 0.9.7j and prior versions, 0.9.8 - 0.9.8b
Description:   A vulnerability was reported in OpenSSL. A remote user may be able to forge certain digital signatures.

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:   OpenBSD has issued the following patches.

Vendor URL: (Links to External Site)
Cause:   Authentication error
Underlying OS:  UNIX (OpenBSD)
Underlying OS Comments:  3.8, 3.9

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

[Original Message Not Available for Viewing]

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