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Category:   Application (Security)  >   OpenSSH Vendors:   OpenSSH.org
OpenSSH scp Directory Traversal Flaw Lets Remote SSH Servers Overwrite Files in Certain Cases
SecurityTracker Alert ID:  1011193
SecurityTracker URL:  http://securitytracker.com/id/1011193
CVE Reference:   CAN-2004-0175   (Links to External Site)
Date:  Sep 8 2004
Impact:   Modification of system information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 3.4p1
Description:   An input validation vulnerability was reported in 'scp' in OpenSSH. A remote SSH server can overwrite arbitrary files on the target system in certain situations.

In CLSA-2004:831 (March 2004), Conectiva reported that scp is affected by a directory traversal vulnerability. The same flaw (or a similar flaw) was originally reported by Michal Zalewski in September 2000 as affecting sshd version 1.2.x [CVE: CVE-2000-0992] and was fixed.

The newly reported vulnerability affects OpenSSH versions prior to 3.4p1.

A malicious SSH server can cause files to be written to arbitrary locations on the target user's system when the target user invokes scp against the malicious SSH server.

Impact:   A remote server can cause files to be written to arbitrary locations on the target user's system when the target user invokes scp against the remote server.
Solution:   A fix is available in OpenSSH 3.4p1 (or later), available at:

http://openssh.org/

Vendor URL:  openssh.org/ (Links to External Site)
Cause:   Access control error, Input validation error
Underlying OS:   Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Sep 8 2004 (Apple Issues Fix) OpenSSH scp Directory Traversal Flaw Lets Remote SSH Servers Overwrite Files in Certain Cases   (Apple Product Security <product-security@apple.com>)
Apple has released a fix for Mac OS X.
Nov 3 2004 (SGI Issues Fix) OpenSSH scp Directory Traversal Flaw Lets Remote SSH Servers Overwrite Files in Certain Cases
SGI has issued a fix for IRIX.
May 18 2005 (Red Hat Issues Fix) OpenSSH scp Directory Traversal Flaw Lets Remote SSH Servers Overwrite Files in Certain Cases
Red Hat has issued a fix.
May 20 2005 (Red Hat Issues Fix) OpenSSH scp Directory Traversal Flaw Lets Remote SSH Servers Overwrite Files in Certain Cases   (bugzilla@redhat.com)
Red Hat has released a fix.
Jun 3 2005 (Red Hat Issues Fix) OpenSSH scp Directory Traversal Flaw Lets Remote SSH Servers Overwrite Files in Certain Cases   (bugzilla@redhat.com)
Red Hat has released a fix.
Jun 13 2005 (Red Hat Issues Fix for rsh) OpenSSH scp Directory Traversal Flaw Lets Remote SSH Servers Overwrite Files in Certain Cases   (bugzilla@redhat.com)
Red Hat has released a fix for RHEL 2.1



 Source Message Contents

Date:  Wed, 8 Sep 2004 01:49:39 -0400
Subject:  [none]


In CLSA-2004:831, Conectiva reported that OpenSSH contains a vulnerability in scp.  A 
remote SSH server can overwrite arbitrary files on the target system in certain 
situations. 

The flaw (or a similar flaw) was originally reported by Michal Zalewski in September 
2000 as affecting sshd version 1.2.x [CVE: CVE-2000-0992] and was fixed.

The newly reported vulnerability affects OpenSSH versions prior to 3.4p1.

A malicious SSH server can cause files to be written to arbitrary locations on the 
target user's system when the target user invokes scp against the malicious SSH server.
 
 


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