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Category:   Application (Generic)  >   Apple Bonjour for Windows Vendors:   Apple Computer
Apple Bonjour for Windows mDNSResponder Null Pointer Dereference Lets Users Deny Service
SecurityTracker Alert ID:  1020845
SecurityTracker URL:  http://securitytracker.com/id/1020845
CVE Reference:   CVE-2008-2326   (Links to External Site)
Updated:  Sep 10 2008
Original Entry Date:  Sep 10 2008
Impact:   Denial of service via local system, Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 1.0.5
Description:   A vulnerability was reported in Apple Bonjour for Windows. A user can cause denial of service conditions.

A user can resolve a specially crafted '.local' domain to trigger a null pointer dereference and cause the target mDNSResponder application to crash.

Mario Ballano of 48bits.com reported this vulnerability.

Impact:   A user can cause denial of service conditions.
Solution:   The vendor has issued a fixed version (1.0.5), available from Apple's Software Downloads web site at:

http://www.apple.com/support/downloads/

The download file is named: "BonjourSetup.exe"
Its SHA-1 digest is: 681e3505bb9d7780c200e5a5eba43e8ba7062c05

The fix is also included in iTunes 8.0.

The vendor's advisory is available at:

http://support.apple.com/kb/HT2990

Vendor URL:  support.apple.com/kb/HT2990 (Links to External Site)
Cause:   State error
Underlying OS:   Windows (2000), Windows (2003), Windows (Vista), Windows (XP)

Message History:   None.


 Source Message Contents

Date:  Tue, 9 Sep 2008 13:48:24 -0700
Subject:  APPLE-SA-2009-09-09 Bonjour for Windows 1.0.5

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

APPLE-SA-2009-09-09 Bonjour for Windows 1.0.5

Bonjour for Windows 1.0.5 is now available and addresses the
following issues:

mDNSResponder
CVE-ID:  CVE-2008-2326
Available for:  Windows Vista, XP SP2 and SP3, 2003, 2000
Impact:  Resolving a maliciously crafted ".local" domain name may
cause an unexpected application termination
Description:  A null pointer dereference issue exists in the Bonjour
Namespace Provider. Resolving a maliciously crafted ".local" domain
name containing a long DNS label may cause an unexpected application
termination. This update addresses the issue by performing additional
validation of DNS labels. This issue does not affect systems running
Mac OS X. Credit to Mario Ballano of 48bits.com for reporting this
issue.

mDNSResponder
CVE-ID:  CVE-2008-3630
Available for:  Windows Vista, XP SP2 and SP3, 2003, 2000
Impact:  mDNSResponder may return forged information for unicast DNS
queries
Description:  Bonjour for Windows provides Zero Configuration
Networking, Multicast DNS, and Network Service Discovery for Windows
users. It's also possible to use the Bonjour API to issue
conventional unicast DNS queries. A weakness in the DNS protocol may
allow a remote attacker to spoof DNS responses. As a result, if there
are applications that use Bonjour for Windows for unicast DNS, those
applications may receive forged information. However, there are no
known applications that use the Bonjour APIs for unicast DNS hostname
resolution. This update addresses the issue by implementing source
port and transaction ID randomization to improve resilience against
spoofing attacks. This change does not affect Multicast DNS
resolution.

Bonjour for Windows 1.0.5 is included in iTunes 8.0.

Bonjour for Windows 1.0.5 may be obtained from
Apple's Software Downloads web site:
http://www.apple.com/support/downloads/

The download file is named:  "BonjourSetup.exe"
Its SHA-1 digest is:  681e3505bb9d7780c200e5a5eba43e8ba7062c05

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:
http://www.apple.com/support/security/pgp/

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