TITLE:
Linux Kernel URB Handling Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA16969

VERIFY ADVISORY:
http://secunia.com/advisories/16969/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
Local system

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

DESCRIPTION:
A vulnerability and a security issue have been reported in the Linux
Kernel, which can be exploited by malicious, local users to cause a
DoS (Denial of Service).

1) An error in handling asynchronous USB access via usbdevio can be
exploited to crash the kernel via a process that issues an URB (USB
Request Block) from userspace and terminates before the URB returns.

Successful exploitation requires that the user has permissions to
access an USB device. 

2) An error in jiffies comparison in the "ipt_recent.c" netfilter
module, when its value is greater than LONG_MAX, may cause ipt_recent
netfilter rules to block too early.

SOLUTION:
Secunia is not currently aware of a fixed version.

Grant only trusted users access to affected systems.

PROVIDED AND/OR DISCOVERED BY:
1) Harald Welte
2) Juergen Kreileder

ORIGINAL ADVISORY:
http://marc.theaimsgroup.com/?l=linux-kernel&m=112766129313883
http://blog.blackdown.de/2005/05/09/fixing-the-ipt_recent-netfilter-module/

----------------------------------------------------------------------

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

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


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

----------------------------------------------------------------------

Unsubscribe: Secunia Security Advisories
http://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org

----------------------------------------------------------------------