16779 : ZyXEL ZyNOS Fragmented IP Packet Saturation DoS
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Info

Last Modified
about 1 year ago

Percent Complete
100%

Disclosure
May 24, 2005

Discovery
May 02, 2005

Dates

Exploit
May 24, 2005

Solution
Unknown

Keywords

 No Keywords

Description

 ZyXEL ZyNOS contains a flaw that may allow a remote denial of service. The issue is caused due to an error in the handling of malformed fragmented IP packets. Upon receiving a large number of fragmented packets, the CPU consumes a large amount of resources for the re-assembling and processing of the packets resulting in a loss of availability for the router.

Classification

 Location: Remote/Network Access Required
Attack Type: Denial of Service
Impact: Loss of Availability
Exploit: Exploit Available
Disclosure: OSVDB Verified

Solution

 Upgrade to the firmware version 3.40 (GT.5) or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.

Products
ZyXEL Communications Corporation
Watch-list
ZyNOS
Watch-list
 3.40 (KO.1)

References

Credit
  • Federico Kirschbaum - fedekBrand New Doo Dooinfobyte.com.ar - Infobyte Security Research

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