D-Link DIR-823G GoAhead Configuration /HNAP1 Shell Metacharacter command injection

Summaryinfo

A vulnerability identified as critical has been detected in D-Link DIR-823G. Affected by this vulnerability is an unknown functionality of the file /HNAP1 of the component GoAhead Configuration. Performing a manipulation as part of Shell Metacharacter results in command injection. This vulnerability is reported as CVE-2018-17787. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, was found in D-Link DIR-823G (Router Operating System) (affected version not known). This affects some unknown functionality of the file /HNAP1 of the component GoAhead Configuration. The manipulation as part of a Shell Metacharacter leads to a command injection vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

On D-Link DIR-823G devices, the GoAhead configuration allows /HNAP1 Command Injection via shell metacharacters in the POST data, because this data is sent directly to the "system" library function.

The bug was discovered 10/01/2018. The weakness was disclosed 10/02/2018 (Website). It is possible to read the advisory at xz.aliyun.com. This vulnerability is uniquely identified as CVE-2018-17787 since 09/30/2018. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 03/29/2020). 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 $5k-$25k.

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

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Productinfo

Type

• Router Operating System

Vendor

• D-Link

Name

• DIR-823G

License

• commercial

Website

• Vendor: https://www.dlink.com/

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CPE 2.2info

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