TP-LINK WVR/WAR/ER webfilter.lua new-time command injection

Summaryinfo

A vulnerability was found in TP-LINK WVR, WAR and ER. It has been classified as critical. The impacted element is an unknown function of the file webfilter.lua. The manipulation of the argument new-time as part of Variable leads to command injection. This vulnerability is uniquely identified as CVE-2017-15636. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in TP-LINK WVR, WAR and ER (Wireless LAN Software) (unknown version) and classified as critical. This issue affects an unknown code block of the file webfilter.lua. The manipulation of the argument new-time as part of a Variable leads to a command injection vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

TP-Link WVR, WAR and ER devices allow remote authenticated administrators to execute arbitrary commands via command injection in the new-time variable in the webfilter.lua file.

The bug was discovered 01/10/2018. The weakness was disclosed 01/11/2018 as not defined posting (Bugtraq). It is possible to read the advisory at securityfocus.com. The identification of this vulnerability is CVE-2017-15636 since 10/19/2017. The attack may be initiated remotely. The requirement for exploitation is a simple authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $0-$5k.

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

The entries VDB-111744, VDB-111745, VDB-111746 and VDB-111747 are pretty similar. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Wireless LAN Software

Vendor

• TP-LINK

Name

• ER
• WAR
• WVR

License

• commercial

Website

• Vendor: https://www.tp-link.com/

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Entryinfo

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