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Category:   Application (Security)  >   OpenSSH Vendors:   OpenSSH.org
(OpenBSD Issues Fix) OpenSSH Unsafe Default Configuration May Let Local Users Execute Arbitrary Commands
SecurityTracker Alert ID:  1019734
SecurityTracker URL:  http://securitytracker.com/id/1019734
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Mar 31 2008
Impact:   Execution of arbitrary code via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.8 and prior versions
Description:   A vulnerability was reported in OpenSSH. A local user may be able to bypass security restrictions to execute arbitrary commands.

In the default configuration, a local user with write privileges to the '~/.ssh/rc' file can modify the file and cause sshd to execute commands in the file even if an sshd_config(5) ForceCommand directive is in effect.

This behavior is documented but considered by the vendor to be an unsafe default.

Impact:   A local user may be able to execute arbitrary commands.
Solution:   OpenBSD has issued the following patches.

ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.1/common/015_openssh.patch
ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.2/common/010_openssh.patch
ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.3/common/001_openssh.patch

Vendor URL:  www.openssh.org/ (Links to External Site)
Cause:   Configuration error
Underlying OS:  UNIX (OpenBSD)
Underlying OS Comments:  4.1, 4.2, 4.3

Message History:   This archive entry is a follow-up to the message listed below.
Mar 31 2008 OpenSSH Unsafe Default Configuration May Let Local Users Execute Arbitrary Commands



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