D-Link DIR-890L A2 Captcha captcha_(number).jpeg access control

Summaryinfo

A vulnerability was found in D-Link DIR-890L A2 and classified as critical. The impacted element is an unknown function of the file /docs/captcha_(number).jpeg of the component Captcha. Such manipulation leads to access control. This vulnerability is documented as CVE-2018-12103. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in D-Link DIR-890L A2 (Router Operating System) (the affected version is unknown). It has been rated as critical. Affected by this issue is an unknown code of the file /docs/captcha_(number).jpeg of the component Captcha. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability. CVE summarizes:

An issue was discovered on D-Link DIR-890L A2 devices. Due to the predictability of the /docs/captcha_(number).jpeg URI, being local to the network, but unauthenticated to the administrator's panel, an attacker can disclose the CAPTCHAs used by the access point and can elect to load the CAPTCHA of their choosing, leading to unauthorized login attempts to the access point.

The bug was discovered 06/23/2018. The weakness was released 07/05/2018 as not defined mailinglist post (Full-Disclosure). The advisory is available at seclists.org. This vulnerability is handled as CVE-2018-12103 since 06/11/2018. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 05/26/2020). This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

The vulnerability was handled as a non-public zero-day exploit for at least 12 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-890L A2

License

• commercial

Website

• Vendor: https://www.dlink.com/

CPE 2.3info

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CPE 2.2info

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