ZyXEL P660HN-T1A up to 7.3.15.0 Remote System Log Forwarder ViewLog.asp remote_host command injection

Summaryinfo

A vulnerability has been found in ZyXEL P660HN-T1A up to 7.3.15.0 and classified as critical. The affected element is an unknown function of the file ViewLog.asp of the component Remote System Log Forwarder. This manipulation of the argument remote_host as part of Parameter causes command injection. This vulnerability is registered as CVE-2017-18368. Remote exploitation of the attack is possible. Furthermore, an exploit is available.

Detailsinfo

A vulnerability was found in ZyXEL P660HN-T1A up to 7.3.15.0 (Router Operating System). It has been declared as critical. Affected by this vulnerability is an unknown part of the file ViewLog.asp of the component Remote System Log Forwarder. The manipulation of the argument remote_host as part of a Parameter leads to a command injection vulnerability. The CWE definition for the vulnerability is CWE-77. The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The ZyXEL P660HN-T1A v1 TCLinux Fw $7.3.15.0 v001 / 3.40(ULM.0)b31 router distributed by TrueOnline has a command injection vulnerability in the Remote System Log forwarding function, which is accessible by an unauthenticated user. The vulnerability is in the ViewLog.asp page and can be exploited through the remote_host parameter.

The weakness was published 05/02/2019. This vulnerability is known as CVE-2017-18368 since 05/02/2019. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details and also a exploit are known. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/04/2025). MITRE ATT&CK project uses the attack technique T1202 for this issue.

It is declared as attacked. By approaching the search of inurl:ViewLog.asp it is possible to find vulnerable targets with Google Hacking. The vulnerability scanner Nessus provides a plugin with the ID 241345 (Zyxel Router Command Injection), which helps to determine the existence of the flaw in a target environment. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 08/07/2023 with a due date of 08/28/2023:

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (241345). Similar entries are available at VDB-134308 and VDB-134307. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Router Operating System

Vendor

• ZyXEL

Name

• P660HN-T1A

Version

• 7.3.0
• 7.3.1
• 7.3.2
• 7.3.3
• 7.3.4
• 7.3.5
• 7.3.6
• 7.3.7
• 7.3.8
• 7.3.9
• 7.3.10
• 7.3.11
• 7.3.12
• 7.3.13
• 7.3.14
• 7.3.15.0

License

• commercial

Website

• Vendor: https://www.zyxel.com/

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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