Multiple Vendor SSH RSA Signature Forging Vulnerability

Bugtraq ID:	8094
Class:	Failure to Handle Exceptional Conditions
CVE:
Remote:	Yes
Local:	No
Published:	Jun 30 2003 12:00AM
Updated:	Jun 30 2003 12:00AM
Credit:	This issue was announced by SSH Communications Security Corp.
Vulnerable:	SSH Communications Security SSH2 3.2.4 SSH Communications Security SSH2 3.2.3 SSH Communications Security SSH2 3.2.2 SSH Communications Security SSH2 3.2.1 SSH Communications Security SSH2 3.2 SSH Communications Security SSH2 3.1.7 SSH Communications Security SSH2 3.1.6 SSH Communications Security SSH2 3.1.5 SSH Communications Security SSH2 3.1.4 SSH Communications Security SSH2 3.1.3 SSH Communications Security SSH2 3.1.2 SSH Communications Security SSH2 3.1.1 SSH Communications Security SSH2 3.1 SSH Communications Security IPSEC Express Toolkit 5.0 .0 F-Secure SSH 5.2 For Windows F-Secure SSH 5.1 For Windows - Microsoft Windows 2000 Advanced Server SP2 - Microsoft Windows 2000 Advanced Server SP1 - Microsoft Windows 2000 Advanced Server - Microsoft Windows 2000 Datacenter Server SP2 - Microsoft Windows 2000 Datacenter Server SP1 - Microsoft Windows 2000 Datacenter Server - Microsoft Windows 2000 Professional SP2 - Microsoft Windows 2000 Professional SP1 - Microsoft Windows 2000 Professional - Microsoft Windows 2000 Server SP2 - Microsoft Windows 2000 Server SP1 - Microsoft Windows 2000 Server - Microsoft Windows 2000 Terminal Services SP2 - Microsoft Windows 2000 Terminal Services SP1 - Microsoft Windows 2000 Terminal Services - Microsoft Windows 95 - Microsoft Windows 98 - Microsoft Windows ME - Microsoft Windows NT Enterprise Server 4.0 SP6a - Microsoft Windows NT Enterprise Server 4.0 SP6 - Microsoft Windows NT Enterprise Server 4.0 SP5 - Microsoft Windows NT Enterprise Server 4.0 SP4 - Microsoft Windows NT Enterprise Server 4.0 SP3 - Microsoft Windows NT Enterprise Server 4.0 SP2 - Microsoft Windows NT Enterprise Server 4.0 SP1 - Microsoft Windows NT Enterprise Server 4.0 - Microsoft Windows NT Server 4.0 SP6a - Microsoft Windows NT Server 4.0 SP6 - Microsoft Windows NT Server 4.0 SP5 - Microsoft Windows NT Server 4.0 SP4 - Microsoft Windows NT Server 4.0 SP3 - Microsoft Windows NT Server 4.0 SP2 - Microsoft Windows NT Server 4.0 SP1 - Microsoft Windows NT Server 4.0 - Microsoft Windows NT Terminal Server 4.0 SP6 - Microsoft Windows NT Terminal Server 4.0 SP5 - Microsoft Windows NT Terminal Server 4.0 SP4 - Microsoft Windows NT Terminal Server 4.0 SP3 - Microsoft Windows NT Terminal Server 4.0 SP2 - Microsoft Windows NT Terminal Server 4.0 SP1 - Microsoft Windows NT Terminal Server 4.0 - Microsoft Windows NT Workstation 4.0 SP6a - Microsoft Windows NT Workstation 4.0 SP6 - Microsoft Windows NT Workstation 4.0 SP5 - Microsoft Windows NT Workstation 4.0 SP4 - Microsoft Windows NT Workstation 4.0 SP3 - Microsoft Windows NT Workstation 4.0 SP2 - Microsoft Windows NT Workstation 4.0 SP1 - Microsoft Windows NT Workstation 4.0 F-Secure SSH 3.2 .0 For UNIX F-Secure SSH 3.1 .0 For UNIX
Not Vulnerable:	SSH Communications Security SSH2 3.2.5 SSH Communications Security SSH2 3.1.8 SSH Communications Security IPSEC Express Toolkit 5.1.1 F-Secure SSH 5.3 For Windows F-Secure SSH 3.2.3 For UNIX

Multiple Vendor SSH RSA Signature Forging Vulnerability

A vulnerability has been reported in SSH Communications Secure Shell and IPSEC Express Toolkit that may theoretically permit adversaries to forge RSA signatures without requiring a RSA private key. This includes signatures that could be used during host or user authentication. It should be noted that this issue may not be practical to exploit and may require an astronomical amount of brute-forcing.

This vulnerability affects versions of the software on Microsoft Windows and Unix derived platforms.

The issue is also reported to affect various F-Secure SSH releases.

Multiple Vendor SSH RSA Signature Forging Vulnerability

Currently we are not aware of any exploits for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected] <mailto:[email protected]>.

Multiple Vendor SSH RSA Signature Forging Vulnerability

Solution:
SSH Communications has advised affected SSH IPSEC Express Toolkit users to upgrade to version 5.1.1, which is not vulnerable to this issue, or to apply a patch. Users are advised to contact the vendor for further details.

F-Secure has addressed this issue in recent versions. Please contact the vendor to obtain upgrades.

The following fixes are available:


SSH Communications Security SSH2 3.1

• SSH Communications Security Secure Shell 3.1.8 for Servers
  http://www.ssh.com/support/downloads/secureshellserver/updates-and-pac kages-3-1.html


• SSH Communications Security Secure Shell 3.1.8 for Windows Servers
  http://www.ssh.com/support/downloads/secureshellwinserver/updates-and- packages-3-1.html


• SSH Communications Security Secure Shell 3.1.8 for Workstations
  http://www.ssh.com/support/downloads/secureshellwks/updates-and-packag es-3-1.html

SSH Communications Security SSH2 3.1.1

• SSH Communications Security Secure Shell 3.1.8 for Servers
  http://www.ssh.com/support/downloads/secureshellserver/updates-and-pac kages-3-1.html


• SSH Communications Security Secure Shell 3.1.8 for Windows Servers
  http://www.ssh.com/support/downloads/secureshellwinserver/updates-and- packages-3-1.html


• SSH Communications Security Secure Shell 3.1.8 for Workstations
  http://www.ssh.com/support/downloads/secureshellwks/updates-and-packag es-3-1.html

SSH Communications Security SSH2 3.1.2

• SSH Communications Security Secure Shell 3.1.8 for Servers
  http://www.ssh.com/support/downloads/secureshellserver/updates-and-pac kages-3-1.html


• SSH Communications Security Secure Shell 3.1.8 for Windows Servers
  http://www.ssh.com/support/downloads/secureshellwinserver/updates-and- packages-3-1.html


• SSH Communications Security Secure Shell 3.1.8 for Workstations
  http://www.ssh.com/support/downloads/secureshellwks/updates-and-packag es-3-1.html

SSH Communications Security SSH2 3.1.3

• SSH Communications Security Secure Shell 3.1.8 for Servers
  http://www.ssh.com/support/downloads/secureshellserver/updates-and-pac kages-3-1.html


• SSH Communications Security Secure Shell 3.1.8 for Windows Servers
  http://www.ssh.com/support/downloads/secureshellwinserver/updates-and- packages-3-1.html


• SSH Communications Security Secure Shell 3.1.8 for Workstations
  http://www.ssh.com/support/downloads/secureshellwks/updates-and-packag es-3-1.html

SSH Communications Security SSH2 3.1.4

• SSH Communications Security Secure Shell 3.1.8 for Servers
  http://www.ssh.com/support/downloads/secureshellserver/updates-and-pac kages-3-1.html


• SSH Communications Security Secure Shell 3.1.8 for Windows Servers
  http://www.ssh.com/support/downloads/secureshellwinserver/updates-and- packages-3-1.html


• SSH Communications Security Secure Shell 3.1.8 for Workstations
  http://www.ssh.com/support/downloads/secureshellwks/updates-and-packag es-3-1.html

SSH Communications Security SSH2 3.1.5

• SSH Communications Security Secure Shell 3.1.8 for Servers
  http://www.ssh.com/support/downloads/secureshellserver/updates-and-pac kages-3-1.html


• SSH Communications Security Secure Shell 3.1.8 for Windows Servers
  http://www.ssh.com/support/downloads/secureshellwinserver/updates-and- packages-3-1.html


• SSH Communications Security Secure Shell 3.1.8 for Workstations
  http://www.ssh.com/support/downloads/secureshellwks/updates-and-packag es-3-1.html

SSH Communications Security SSH2 3.1.6

• SSH Communications Security Secure Shell 3.1.8 for Servers
  http://www.ssh.com/support/downloads/secureshellserver/updates-and-pac kages-3-1.html


• SSH Communications Security Secure Shell 3.1.8 for Windows Servers
  http://www.ssh.com/support/downloads/secureshellwinserver/updates-and- packages-3-1.html


• SSH Communications Security Secure Shell 3.1.8 for Workstations
  http://www.ssh.com/support/downloads/secureshellwks/updates-and-packag es-3-1.html

SSH Communications Security SSH2 3.1.7

• SSH Communications Security Secure Shell 3.1.8 for Servers
  http://www.ssh.com/support/downloads/secureshellserver/updates-and-pac kages-3-1.html


• SSH Communications Security Secure Shell 3.1.8 for Windows Servers
  http://www.ssh.com/support/downloads/secureshellwinserver/updates-and- packages-3-1.html


• SSH Communications Security Secure Shell 3.1.8 for Workstations
  http://www.ssh.com/support/downloads/secureshellwks/updates-and-packag es-3-1.html

SSH Communications Security SSH2 3.2

• SSH Communications Security Secure Shell 3.2.5 for Servers
  http://www.ssh.com/support/downloads/secureshellserver/updates-and-pac kages-3-2.html


• SSH Communications Security Secure Shell 3.2.5 for Windows Servers
  http://www.ssh.com/support/downloads/secureshellwinserver/updates-and- packages-3-2.html


• SSH Communications Security Secure Shell 3.2.5 for Workstations
  http://www.ssh.com/support/downloads/secureshellwks/updates-and-packag es-3-2.html


• SSH Communications Security SSHSecureShellClient-3.2.5.exe
  For non-commercial users.
  ftp://ftp.ssh.com/pub/ssh/SSHSecureShellClient-3.2.5.exe

SSH Communications Security SSH2 3.2.1

• SSH Communications Security Secure Shell 3.2.5 for Servers
  http://www.ssh.com/support/downloads/secureshellserver/updates-and-pac kages-3-2.html


• SSH Communications Security Secure Shell 3.2.5 for Windows Servers
  http://www.ssh.com/support/downloads/secureshellwinserver/updates-and- packages-3-2.html


• SSH Communications Security Secure Shell 3.2.5 for Workstations
  http://www.ssh.com/support/downloads/secureshellwks/updates-and-packag es-3-2.html


• SSH Communications Security SSHSecureShellClient-3.2.5.exe
  For non-commercial users.
  ftp://ftp.ssh.com/pub/ssh/SSHSecureShellClient-3.2.5.exe

SSH Communications Security SSH2 3.2.2

• SSH Communications Security Secure Shell 3.2.5 for Servers
  http://www.ssh.com/support/downloads/secureshellserver/updates-and-pac kages-3-2.html


• SSH Communications Security Secure Shell 3.2.5 for Windows Servers
  http://www.ssh.com/support/downloads/secureshellwinserver/updates-and- packages-3-2.html


• SSH Communications Security Secure Shell 3.2.5 for Workstations
  http://www.ssh.com/support/downloads/secureshellwks/updates-and-packag es-3-2.html


• SSH Communications Security SSHSecureShellClient-3.2.5.exe
  For non-commercial users.
  ftp://ftp.ssh.com/pub/ssh/SSHSecureShellClient-3.2.5.exe

SSH Communications Security SSH2 3.2.3

• SSH Communications Security Secure Shell 3.2.5 for Servers
  http://www.ssh.com/support/downloads/secureshellserver/updates-and-pac kages-3-2.html


• SSH Communications Security Secure Shell 3.2.5 for Windows Servers
  http://www.ssh.com/support/downloads/secureshellwinserver/updates-and- packages-3-2.html


• SSH Communications Security Secure Shell 3.2.5 for Workstations
  http://www.ssh.com/support/downloads/secureshellwks/updates-and-packag es-3-2.html


• SSH Communications Security SSHSecureShellClient-3.2.5.exe
  For non-commercial users.
  ftp://ftp.ssh.com/pub/ssh/SSHSecureShellClient-3.2.5.exe

SSH Communications Security SSH2 3.2.4

• SSH Communications Security Secure Shell 3.2.5 for Servers
  http://www.ssh.com/support/downloads/secureshellserver/updates-and-pac kages-3-2.html


• SSH Communications Security Secure Shell 3.2.5 for Windows Servers
  http://www.ssh.com/support/downloads/secureshellwinserver/updates-and- packages-3-2.html


• SSH Communications Security Secure Shell 3.2.5 for Workstations
  http://www.ssh.com/support/downloads/secureshellwks/updates-and-packag es-3-2.html


• SSH Communications Security SSHSecureShellClient-3.2.5.exe
  For non-commercial users.
  ftp://ftp.ssh.com/pub/ssh/SSHSecureShellClient-3.2.5.exe

Multiple Vendor SSH RSA Signature Forging Vulnerability

References:

• RSA signature verification vulnerability (F-Secure)
  
• SSH Download Page (F-Secure)
  
• SSH Secure Shell 3.1 to 3.2.4 and SSH IPSEC Express Toolkit 5.0.0 RSA signature (SSH Communications)