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ZyXEL ZyNOS Fragmented IP Packets Denial of Service
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Secunia Advisory:
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SA15463
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Release Date:
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2005-05-24
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Last Update:
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2005-05-26
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Critical:
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Not critical
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Impact:
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DoS
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Where:
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From local network
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Solution Status:
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Vendor Patch
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| OS: | ZyXEL ZyNOS 3.x
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| | 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.
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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.
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4. ZyXEL Prestige Routers Denial of Service Vulnerability
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5. ZyXEL ZyNOS Frame Padding Information Disclosure Vulnerability
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6. ZyXEL Products rpAuth Form Cross-Site Scripting Vulnerability
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