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2003: 2,700 advisories published
2004: 3,100 advisories published
2005: 4,600 advisories published
2006: 5,300 advisories published

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TITLE:
Linux Kernel "isdn_net_setcfg()" Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA27842

VERIFY ADVISORY:
http://secunia.com/advisories/27842/

CRITICAL:
Less critical

IMPACT:
Unknown

WHERE:
Local system

OPERATING SYSTEM:
Linux Kernel 2.6.x
http://secunia.com/product/2719/

DESCRIPTION:
A vulnerability with unknown impact has been reported in the Linux
Kernel.

The vulnerability is caused due to a boundary error within the
"isdn_net_setcfg()" function in drivers/isdn/i4l/isdn_net.c when
processing IOCTL configuration requests sent to the ISDN pseudo
device (/dev/isdnctrl). This can be exploited to cause a buffer
overflow via a specially crafted IIOCNETSCF IOCTL request. 

Successful exploitation requires write access to /dev/isdnctrl.

The vulnerability is reported in version 2.6.23. Other versions may
also be affected.

SOLUTION:
Fixed in the GIT repository.
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0f13864e5b24d9cbe18d125d41bfa4b726a82e40

Restrict write access to /dev/isdnctrl to trusted users only.

PROVIDED AND/OR DISCOVERED BY:
Venustech AD-LAB

ORIGINAL ADVISORY:
http://bugzilla.kernel.org/show_bug.cgi?id=9416

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