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ZyXEL ZyNOS Fragmented IP Packets Denial of Service Advisory Available in Danish 

Secunia Advisory: SA15463  
Release Date: 2005-05-24
Last Update: 2005-05-26

Critical:
Not critical
Impact: DoS
Where: From local network
Solution Status: Vendor Patch

OS:ZyXEL ZyNOS 3.x


CVE reference:CVE-2005-1717 (Secunia mirror)

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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

Changelog:
2005-05-26: Added CVE reference.



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

6 Related Secunia Security Advisories

1. ZyXEL Products Multiple Vulnerabilities
2. ZyXEL ZyWALL / ZyNOS Cross-Site Request Forgery
3. ZyXEL Prestige Routers Unprotected Reset Functionality
4. ZyXEL Prestige Routers Denial of Service Vulnerability
5. ZyXEL ZyNOS Frame Padding Information Disclosure Vulnerability
6. ZyXEL Products rpAuth Form Cross-Site Scripting Vulnerability


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If you have new information regarding this Secunia advisory or a product in our database, please send it to us using either our web form or email us at vuln@secunia.com.

Ideas, suggestions, and other feedback are most welcome.








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