Title: Zyxel Prestige SDSL Router IP Fragment Reassembly Vulnerability
Severity: HIGH
Description:
Prestige is a product line of DSL routers produced and distributed by Zyxel.
A problem with Zyxel routers has been discovered that could lead to a remote denial of service attack. The problem is in the receipt of fragmented packets.
When a Zyxel router receives fragmented packets that after reassembly is greater than 64 kilobytes in length, the router crashes. The router must be power cycled to resume normal operation. This could lead to a remote user denying service to a legitimate user of the router.
The router is affected only by fragmented packets received through the DSL interface. Fragmented packets sent through the LAN interface have no affect on the system.
This problem has been reported in the model 681 routers, and may affect others in the Prestige product line as well.
Affected Products:
- ZyXEL Prestige 681 0.0.0
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