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Category:   Application (Generic)  >   xterm Vendors:   Dickey, Thomas E.
xterm DECRQSS Input Validation Flaw Lets Users Inject Arbitrary Commands
SecurityTracker Alert ID:  1021522
SecurityTracker URL:  http://securitytracker.com/id/1021522
CVE Reference:   CVE-2008-2383   (Links to External Site)
Date:  Jan 7 2009
Impact:   Execution of arbitrary code via local system, Execution of arbitrary code via network, User access via local system, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): prior to Patch #238
Description:   A vulnerability was reported in xterm. A user can cause arbitrary commands to be executed on the target user's system.

A user can create a command string containing a specially crafted Device Control Request Status String (DECRQSS) escape sequence that, when exectued by the target user, will execute arbitrary commands on the target user's system. The code will run with the privileges of the target user.

A demonstration exploit command is provided:

perl -e 'print "\eP\$q\nbad-command\n\e\\"'

Impact:   A user can create a string that, when entered or loaded by the target user, will execute arbitrary commands on the target user's system.
Solution:   The vendor has issued a fix (Patch #238).
Vendor URL:  invisible-island.net/xterm (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jan 7 2009 (Red Hat Issues Fix) xterm DECRQSS Input Validation Flaw Lets Users Inject Arbitrary Commands
Red Hat has released a fix for Red Hat Enterprise Linux 3, 4, and 5.
Jan 7 2009 (Red Hat Issues Fix for hanterm-xf) xterm DECRQSS Input Validation Flaw Lets Users Inject Arbitrary Commands
Red Hat has released a fix for Red Hat Enterprise Linux 2.1.
Mar 9 2009 (Sun Issues Fix for Solaris) xterm DECRQSS Input Validation Flaw Lets Users Inject Arbitrary Commands
Sun has issued a fix for OpenSolaris.



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