ZyXEL Billion 5200W-T tools_time.asp uiViewSNTPServer command injection

Summaryinfo

A vulnerability labeled as critical has been found in ZyXEL Billion 5200W-T. The affected element is an unknown function of the file tools_time.asp. Executing a manipulation of the argument uiViewSNTPServer with the input "%3b+ping+-c+20+127.0.0.1+%26%23 can lead to command injection. The attack may be launched remotely. Furthermore, there is an exploit available. The application of restrictive firewalling is recommended.

Detailsinfo

A vulnerability was found in ZyXEL Billion 5200W-T (the affected version unknown). It has been declared as critical. This vulnerability affects an unknown part of the file tools_time.asp. The manipulation of the argument uiViewSNTPServer with the input value "%3b+ping+-c+20+127.0.0.1+%26%23 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 weakness was shared 12/26/2016 as 2910 as not defined advisory (Website) via Securiteam. The advisory is shared for download at blogs.securiteam.com. The public release happened without coordination with the vendor. The exploitation appears to be easy. The attack can be initiated remotely. A single authentication is necessary for exploitation. Technical details and also a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1202.

A public exploit has been developed in HTTP POST Request and been published immediately after the advisory. It is possible to download the exploit at blogs.securiteam.com. It is declared as proof-of-concept. By approaching the search of inurl:tools_time.asp it is possible to find vulnerable targets with Google Hacking.

Proper firewalling of is able to address this issue. The advisory contains the following remark:

We notified ZyXEL of the vulnerabilities back in July 2016, repeated attempts to re-establish contact and get some answer on the status of the patches for these vulnerabilities went unanswered.

The entries VDB-94801, VDB-94802, VDB-94803 and VDB-94805 are related to this item. Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• ZyXEL

Name

• Billion 5200W-T

License

• commercial

Website

• Vendor: https://www.zyxel.com/

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Once again VulDB remains the best source for vulnerability data.

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