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Remote Command Execution Vulnerability Affects Many D-Link Routers

Proof-of-concept (PoC) exploits were recently made public by researchers for remote command execution and information disclosure vulnerabilities affecting many D-Link routers.

Proof-of-concept (PoC) exploits were recently made public by researchers for remote command execution and information disclosure vulnerabilities affecting many D-Link routers.

Miguel Méndez Zúñiga and Pablo Pollanco of Telefónica Chile recently disclosed the details of the vulnerabilities in a couple of blog posts published on Medium. In addition to technical details and PoC code, they have posted videos showing how each of the flaws can be exploited.

According to D-Link, the company first learned of the vulnerabilities in mid-October, but its initial security advisory only listed DIR-859 routers as being affected — this was the model on which the researchers conducted their tests.

However, an updated advisory published by the company late last year shows that the vulnerabilities actually impact over a dozen D-Link DIR models, including ones that are no longer supported.

The vendor has already released firmware updates that should address the vulnerabilities for some of the impacted devices and should soon release patches for the rest of them, including for DIR-818Lx, which has reached end of life. Other affected models that have reached end of life will not receive patches.

The remote command execution vulnerability, tracked as CVE-2019-17621, is related to how UPnP requests are handled and it can allow an unauthenticated attacker to take control of vulnerable devices.

However, exploitation requires access to the local area network (LAN) housing the router, which, D-Link says, “narrows the risk of an attack considerably.”

The information disclosure flaw allows an attacker to obtain a device’s VPN configuration file, which can contain sensitive information.

Related: Flaw Gives Hackers Remote Access to Files Stored on D-Link DNS-320 Devices

Related: Credential Leaking Vulnerabilities Impact Comba, D-Link Routers

Related: No Patch for Critical Code Execution Flaw Affecting D-Link Router

Related: D-Link Patches Code Execution, XSS Flaws in Management Tool

Written By

Eduard Kovacs (@EduardKovacs) is a contributing editor at SecurityWeek. He worked as a high school IT teacher for two years before starting a career in journalism as Softpedia’s security news reporter. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering.

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