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TITLE:
ZyXEL ZyNOS Fragmented IP Packets Denial of Service

SECUNIA ADVISORY ID:
SA15463

VERIFY ADVISORY:
http://secunia.com/advisories/15463/

CRITICAL:
Not critical

IMPACT:
DoS

WHERE:
>From local network

OPERATING SYSTEM:
ZyXEL ZyNOS 3.x
http://secunia.com/product/149/

DESCRIPTION:
Federico Kirschbaum has reported a vulnerability in ZyXEL ZyNOS,
which can be exploited by malicious people to cause a DoS (Denial of
Service).

The vulnerability is caused due to an error in the handling of
malformed fragmented IP packets. This can be exploited to cause a
vulnerable router to consume a large amount of CPU resources.

The vulnerability has been reported in Prestige 650R-31 running ZyNOS
FW 3.40 (KO.1). Other Prestige routers and versions of ZyNOS may also
be affected.

NOTE: According to the original advisory, the vulnerability was only
tested on the local interface. It is therefore not currently known
whether the external interface also is affected.

SOLUTION:
Update the firmware to version 3.40 (GT.5).

PROVIDED AND/OR DISCOVERED BY:
Federico Kirschbaum

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About:
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everybody keeping their systems up to date against the latest
vulnerabilities.

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