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Category:   Application (Generic)  >   Dhcp Vendors:   ISC (Internet Software Consortium)
(NetBSD Issues Fix) ISC DHCP Meta-Character Filtering Flaw in dhclient Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1025465
SecurityTracker URL:  http://securitytracker.com/id/1025465
CVE Reference:   CVE-2011-0997   (Links to External Site)
Date:  May 2 2011
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 3.x prior to 3.1-ESV-R1, 4.x prior to 4.1-ESV-R2, 4.2 prior to 4.2.1-P1
Description:   A vulnerability was reported in ISC DHCP. A remote user can execute arbitrary commands on the target system.

A remote DHCP server can return specially crafted hostname field meta-characters to cause the connected dhclient to execute arbitrary commands.

Sebastian Krahmer and Marius Tomaschewski of the SUSE Security Team reported this vulnerability.

Impact:   A remote user can execute arbitrary code on the target system.
Solution:   NetBSD has issued a fix.

The NetBSD advisory is available at:

http://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2011-005.txt.asc

Vendor URL:  www.isc.org/software/dhcp/advisories/cve-2011-0997 (Links to External Site)
Cause:   Input validation error
Underlying OS:  UNIX (NetBSD)
Underlying OS Comments:  4.0, 5.0, 5.1

Message History:   This archive entry is a follow-up to the message listed below.
Apr 6 2011 ISC DHCP Meta-Character Filtering Flaw in dhclient Lets Remote Users Execute Arbitrary Code



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