D-Link DIR-620 up to 2.0.22 Custom Firmware index.cgi res_buf os command injection

Summaryinfo

A vulnerability identified as critical has been detected in D-Link DIR-620 up to 2.0.22. This affects an unknown part of the file index.cgi of the component Custom Firmware. This manipulation of the argument res_buf as part of Parameter causes os command injection. This vulnerability is tracked as CVE-2018-6211. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability classified as critical was found in D-Link DIR-620 up to 2.0.22 (Router Operating System). Affected by this vulnerability is some unknown functionality of the file index.cgi of the component Custom Firmware. The manipulation of the argument res_buf as part of a Parameter leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS 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:

On D-Link DIR-620 devices with a certain customized (by ISP) variant of firmware 1.0.3, 1.0.37, 1.3.1, 1.3.3, 1.3.7, 1.4.0, and 2.0.22, OS command injection is possible as a result of incorrect processing of the res_buf parameter to index.cgi.

The bug was discovered 01/15/2018. The weakness was disclosed 06/20/2018 (Website). The advisory is shared at securitynewspaper.com. This vulnerability is known as CVE-2018-6211 since 01/24/2018. The exploitation appears to be easy. The attack can be launched remotely. A single authentication is required for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 02/20/2020). MITRE ATT&CK project uses the attack technique T1202 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 156 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.

The entries VDB-119738 and VDB-119739 are pretty similar. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Router Operating System

Vendor

• D-Link

Name

• DIR-620

Version

• 1.0.3
• 1.0.37
• 1.3.1
• 1.3.3
• 1.3.7
• 1.4.0
• 2.0.22

License

• commercial

Website

• Vendor: https://www.dlink.com/

CPE 2.3info

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CPE 2.2info

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Entryinfo

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

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