Technical Description

A vulnerability has been identified in Apple Mac OS X, which could be exploited by remote attackers to cause a denial of service. This issue is caused by an error in the VPN daemon (vpnd) when handling connection packets sent to port 4112/UDP, which could be exploited by remote attackers to cause a vulnerable daemon to crash or stop responding, creating a denial of service condition.

Affected Products

Apple Mac OS X version 10.5.1 and prior
Apple Mac OS X Server version 10.5.1 and prior

Solution

Apple Security Update 2008-004 (PPC) :
http://www.apple.com/support/downloads/securityupdate2008004ppc.html

Apple Security Update 2008-004 (Intel) :
http://www.apple.com/support/downloads/securityupdate2008004intel.html

Apple Security Update 2008-004 Server (PPC) :
http://www.apple.com/support/downloads/securityupdate2008004serverppc.html

Apple Security Update 2008-004 Server (Intel) :
http://www.apple.com/support/downloads/securityupdate2008004serverintel.html

Apple Mac OS X 10.5.4 Combo Update :
http://www.apple.com/support/downloads/macosx1054comboupdate.html

Apple Mac OS X 10.5.4 Update :
http://www.apple.com/support/downloads/macosx1054update.html

Apple Mac OS X Server 10.5.4 :
http://www.apple.com/support/downloads/macosxserver1054.html

Apple Mac OS X Server Combo 10.5.4 :
http://www.apple.com/support/downloads/macosxservercombo1054.html

References

http://www.vupen.com/english/advisories/2007/4145
http://support.apple.com/kb/HT2163

Credits

Vulnerability reported by mu-b.

ChangeLog

2007-12-10 : Initial release
2008-07-01 : Updated Solution

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