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TITLE:
OpenBSD "ip_ctloutput()" and "ip6_ctloutput()" NULL Pointer
Dereference

SECUNIA ADVISORY ID:
SA37190

VERIFY ADVISORY:
http://secunia.com/advisories/37190/

DESCRIPTION:
A vulnerability has been reported in OpenBSD, which can be exploited
by malicious, local users to cause a DoS (Denial of Service).

The vulnerability is caused due to a NULL pointer dereference error
within the "ip_ctloutput()" function in sys/netinet/ip_output.c and
the "ip6_ctloutput()" function in sys/netinet6/ip6_output.c. This can
be exploited to crash an affected kernel by calling "getsockopt()"
with e.g. IP_AUTH_LEVEL, IP_ESP_TRANS_LEVEL, IP_ESP_NETWORK_LEVEL, or
IP_IPCOMP_LEVEL.

Note: Successful exploitation requires root privileges.

SOLUTION:
Apply patches.

OpenBSD 4.4:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.4/common/016_getsockopt.patch

OpenBSD 4.5:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.5/common/009_getsockopt.patch

OpenBSD 4.6:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.6/common/003_getsockopt.patch

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Clement LECIGNE.

ORIGINAL ADVISORY:
http://openbsd.org/errata44.html#016_getsockopt
http://openbsd.org/errata45.html#009_getsockopt
http://openbsd.org/errata46.html#003_getsockopt

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