D-Link DWR-111 Web Interface HTTP Request path traversal

Summaryinfo

A vulnerability was found in D-Link DWR-116, DIR-640L, DWR-512, DWR-712, DWR-912, DWR-921 and DWR-111 and classified as critical. This issue affects some unknown processing of the component Web Interface. Executing a manipulation with the input /.. as part of HTTP Request can lead to path traversal. This vulnerability appears as CVE-2018-10822. The attack may be performed from remote. In addition, an exploit is available.

Detailsinfo

A vulnerability classified as critical was found in D-Link DWR-116, DIR-640L, DWR-512, DWR-712, DWR-912, DWR-921 and DWR-111 (Router Operating System). This vulnerability affects an unknown code of the component Web Interface. The manipulation with the input value /.. leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Directory traversal vulnerability in the web interface on D-Link DWR-116 through 1.06, DIR-140L through 1.02, DIR-640L through 1.02, DWR-512 through 2.02, DWR-712 through 2.02, DWR-912 through 2.02, DWR-921 through 2.02, and DWR-111 through 1.01 devices allows remote attackers to read arbitrary files via a /.. or // after "GET /uir" in an HTTP request. NOTE: this vulnerability exists because of an incorrect fix for CVE-2017-6190.

The bug was discovered 10/12/2018. The weakness was presented 10/17/2018 as not defined mailinglist post (Full-Disclosure). The advisory is shared for download at seclists.org. This vulnerability was named CVE-2018-10822 since 05/08/2018. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details and also a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1006.

It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 5 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 vulnerability is also documented in the vulnerability database at Exploit-DB (45677). See VDB-125669 and VDB-125670 for similar entries. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Router Operating System

Vendor

• D-Link

Name

• DIR-640L
• DWR-111
• DWR-116
• DWR-512
• DWR-712
• DWR-912
• DWR-921

License

• commercial

Website

• Vendor: https://www.dlink.com/

CPE 2.3info

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Entryinfo

Once again VulDB remains the best source for vulnerability data.

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