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TITLE:
NetBSD FAST_IPSEC "ipsec4_get_ulp()" Security Bypass

SECUNIA ADVISORY ID:
SA29180

VERIFY ADVISORY:
http://secunia.com/advisories/29180/

CRITICAL:
Moderately critical

IMPACT:
Security Bypass

WHERE:
>From remote

OPERATING SYSTEM:
NetBSD 3.1
http://secunia.com/product/16089/

DESCRIPTION:
A security issue has been reported in NetBSD, which can potentially
be exploited by malicious people to bypass certain security
restrictions.

The security issue is caused due to the "ipsec4_get_ulp()" function
assuming that the "ip_off" field of an IPSec packet is in host endian
form. This can be exploited to bypass IPsec policies if at least one
of two IPsec connected systems with different byte orders is running
a NetBSD operating system.

Successful exploitation requires that the kernel is compiled with the
"FAST_IPSEC" option.

SOLUTION:
Patches have been committed to CVS for the affected NetBSD branches
(see vendor advisory for further details).

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Karl Knutsson.

ORIGINAL ADVISORY:
ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2008-002.txt.asc

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