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Category:   Application (Security)  >   SSH Vendors:   F-Secure
(F-Secure Issues Fix) SSH May Allow Authorized Remote Users to Bypass Server Authentication Configuration Settings and Login Using Passwords When the Server is Configured to Prohibit the Use of Passwords
SecurityTracker Alert ID:  1010608
SecurityTracker URL:  http://securitytracker.com/id/1010608
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jun 29 2004
Impact:   Host/resource access via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 3.0 - 3.1.0 (prior to 3.1.0 build 9)
Description:   A vulnerability was reported in F-Secure SSH. An authorized remote user may be able to login using password authentication when the server has been configured to prohibit password authentication in favor of a stronger method.

In May 2002, F-Secure reported a vulnerability in F-Secure SSH versions 3.0.x and 3.1.0. Only UNIX-based systems are affected, the report said.

If the "AllowedAuthentications" configuration on a server does not include "Password" as an authentication option, some SSH protocol version 2 based clients may be able to override the configuration and still be able to authenticate using passwords.

Impact:   A remote user may be able to authenticate to the SSH server using password authentication when the server is configured to prohibit that method.

According to the vendor, this may affect systems that require stronger authentication methods, such as SecurID or digital certificates, but have set up weak passwords due to the fact that password authentication is not expected to take place at all.

Solution:   The vendor released a fixed version (3.1.0 build 9), available at:

http://www.f-secure.com/webclub

Vendor URL:  support.f-secure.com/enu/corporate/supportissue/ssh/comments/comments-issue-2003120405.shtml (Links to External Site)
Cause:   State error
Underlying OS:   UNIX (Any)

Message History:   This archive entry is a follow-up to the message listed below.
May 21 2002 SSH May Allow Authorized Remote Users to Bypass Server Authentication Configuration Settings and Login Using Passwords When the Server is Configured to Prohibit the Use of Passwords



 Source Message Contents

Date:  Tue, 29 Jun 2004 02:20:28 -0400
Subject:  http://support.f-secure.com/enu/corporate/supportissue/ssh/comments/comments-issue-2003120405.shtml


http://support.f-secure.com/enu/corporate/supportissue/ssh/comments/comments-issue-2003120405.shtml

In May 2002, F-Secure reported a vulnerability in F-Secure SSH versions 3.0.x and 3.1.0. 
UNIX-based systems are affected.

If the "AllowedAuthentications" configuration on a server does not include "Password" as 
an authentication option, some SSH protocol version 2 based clients may be able to 
override the configuration and still be able to authenticate using passwords.

The vendor released a fixed version (3.1.0 build 9), available at:

http://www.f-secure.com/webclub

Nessus ID: 12099


 
 


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