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Category:   Application (VPN)  >   SSH Tectia Server Vendors:   SSH Communications
(SSH Issues Fix for Tectia Server) OpenSSL RSA Signatures Can Be Forged
SecurityTracker Alert ID:  1017060
SecurityTracker URL:  http://securitytracker.com/id/1017060
CVE Reference:   CVE-2006-4339   (Links to External Site)
Date:  Oct 13 2006
Impact:   Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in OpenSSL. A remote user may be able to forge certain digital signatures. SSH Tectica Server is also 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:   SSH has issued the following fixes for SSH Tectica Server, available at:

http://www.ssh.com/support/downloads/

SSH Tectia Server/Client 5.1.1
SSH Tectia Server/Client/Connector 5.0.3
SSH Tectia Server/Client/Connector 4.4.7
SSH Tectia Client 4.3.10K
SSH Tectia Client 4.3.3J
SSH Tectia Server for IBM z/OS 5.1.1
SSH Tectia Server for IBM z/OS 5.2.1

The vendor notes that environments where all keys are created with SSH Tectia are not vulnerable.

The SSH advisory is available at:

http://www.ssh.com/company/news/article/786/

Vendor URL:  www.ssh.com/company/news/article/786/ (Links to External Site)
Cause:   Authentication error
Underlying OS:  Linux (Red Hat Enterprise), Linux (SuSE), UNIX (AIX), UNIX (HP/UX), UNIX (Solaris - SunOS), Windows (2000), Windows (2003), z/OS

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



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