Zyxel P660 series modem/router denial of service vulnerability

Overview

Zyxel P660 series modem/router contains a denial of service vulnerability when parsing a high volume of SYN packets on the web management interface.

Description

It has been reported that Zyxel P660 series modem/router (and possibly other models which share the same core firmware) fail to parse a high volume of SYN packets on the web management interface correctly causing the device to reboot. By default, the device runs a web management interface on port tcp/80 which is accessible remotely (LAN and WAN sides).

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Impact

An unauthenticated attacker can cause the device to reboot and become unavailable by sending a stream of SYN packets to the device’s web management interface.

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Solution

We are currently unaware of a practical solution to this problem.

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Restrict Network Access

As a general good security practice, only allow connections from trusted hosts and networks if possible. Restricting access would prevent an attacker from connecting to the service from a blocked network location.

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Vendor Information

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ZyXEL Affected

Notified: June 17, 2013 Updated: July 31, 2013

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

CVSS Metrics

Group	Score	Vector
Base	7.1	AV:N/AC:M/Au:N/C:N/I:N/A:C
Temporal	5.4	E:U/RL:U/RC:UC
Environmental	4.1	CDP:ND/TD:M/CR:ND/IR:ND/AR:ND

References

<http://www.zyxel.com/products_services/p_660h_series.shtml?t=p&gt;

Acknowledgements

Thanks to Alex French for reporting this vulnerability.

This document was written by Michael Orlando.

Other Information

CVE IDs:	CVE-2013-3588
Date Public:	2013-08-06 Date First Published: