(Apple Issues Fix for Time Capsule and AirPort Base Station) ISC DHCP Meta-Character Filtering Flaw in dhclient Lets Remote Users Execute Arbitrary Code
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SecurityTracker Alert ID: 1026312 |
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SecurityTracker URL: http://securitytracker.com/id/1026312
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CVE Reference:
CVE-2011-0997
(Links to External Site)
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Date: Nov 11 2011
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Impact:
Execution of arbitrary code via network, User access via network
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Fix Available: Yes Vendor Confirmed: Yes
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Description:
A vulnerability was reported in ISC DHCP. A remote user can execute arbitrary commands on the target system. Apple Time Capsule and AirPort Base Station are affected.
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.
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Impact:
A remote user can execute arbitrary code on the target system.
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Solution:
Apple has issued a fix for Time Capsule and AirPort Base Station (firmware version 7.6).
The Apple advisory is available at:
http://support.apple.com/kb/HT5005
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Cause:
Input validation error
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Underlying OS:
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Thu, 10 Nov 2011 16:55:51 -0800
Subject: APPLE-SA-2011-11-10-2 Time Capsule and AirPort Base Station (802.11n) Firmware 7.6
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
APPLE-SA-2011-11-10-2 Time Capsule and AirPort Base Station (802.11n)
Firmware 7.6
Time Capsule and AirPort Base Station (802.11n) Firmware 7.6 is now
available and addresses the following:
Available for: AirPort Extreme Base Station with 802.11n,
AirPort Express Base Station with 802.11n, Time Capsule
Impact: An attacker in a privileged network position may be able to
cause arbitrary command execution via malicious DHCP responses
Description: dhclient allowed remote attackers to execute arbitrary
commands via shell metacharacters in a hostname obtained from a DHCP
message. This issue is addressed by stripping shell meta-characters
in dhclient-script.
CVE-ID
CVE-2011-0997 : Sebastian Krahmer and Marius Tomaschewski of the SUSE
Security Team working with ISC
Installation note for Firmware version 7.6
Firmware version 7.6 is installed into Time Capsule or AirPort Base
Station with 802.11n via AirPort Utility, provided with the device.
It is recommended that AirPort Utility 5.5.3 or later be installed
before upgrading to Firmware version 7.6.
AirPort Utility 5.5.3 or later may be obtained through Apple's
Software Download site: http://www.apple.com/support/downloads/
Information will also be posted to the Apple Security Updates
web site: http://support.apple.com/kb/HT1222
This message is signed with Apple's Product Security PGP key,
and details are available at:
https://www.apple.com/support/security/pgp/
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