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TITLE:
Apple Mac OS X "ipcomp6_input()" Denial of Service

SECUNIA ADVISORY ID:
SA29130

VERIFY ADVISORY:
http://secunia.com/advisories/29130/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

OPERATING SYSTEM:
Apple Macintosh OS X
http://secunia.com/product/96/

DESCRIPTION:
A vulnerability has been reported in Apple Mac OS X, which can be
exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to an error within the
"ipcomp6_input()" function in bsd/netinet6/ipcomp_input.c when
processing IPv6 packets with an IPComp header. This can be exploited
to crash a vulnerable system by sending a specially crafted IPv6
packet.

This is related to:
SA28788

The vulnerability is reported in Mac OS X 10.5.1 and 10.5.2. Other
versions may also be affected.

SOLUTION:
Use a firewall to block IPv6 packets containing an IPComp header.

PROVIDED AND/OR DISCOVERED BY:
Discovered in the KAME Project by Shoichi Sakane. Reported in Mac OS
X by mu-b.

ORIGINAL ADVISORY:
http://www.digit-labs.org/files/exploits/xnu-ipv6-ipcomp.c

OTHER REFERENCES:
SA28788:
http://secunia.com/advisories/28788/

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

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http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
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Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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