CVE-2019-17621
Published on December 30, 2019
The UPnP endpoint URL /gena.cgi in the D-Link DIR-859 Wi-Fi router 1.05 and 1.06B01 Beta01 allows an Unauthenticated remote attacker to execute system commands as root, by sending a specially crafted HTTP SUBSCRIBE request to the UPnP service when connecting to the local network.
Known Exploited Vulnerability
This D-Link DIR-859 Router Command Execution Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. D-Link DIR-859 router contains a command execution vulnerability in the UPnP endpoint URL, /gena.cgi. Exploitation allows an unauthenticated remote attacker to execute system commands as root by sending a specially crafted HTTP SUBSCRIBE request to the UPnP service when connecting to the local network.
The following remediation steps are recommended / required by July 20, 2023: Apply updates per vendor instructions or discontinue use of the product if updates are unavailable
Vulnerability Analysis
CVE-2019-17621 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. It has the highest possible exploitability rating (3.9). The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
What is a Shell injection Vulnerability?
The software 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.
CVE-2019-17621 has been classified to as a Shell injection vulnerability or weakness.
Products Associated with CVE-2019-17621
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What versions are vulnerable to CVE-2019-17621?
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Each of the following must match for the vulnerability to exist.
Each of the following must match for the vulnerability to exist.
Each of the following must match for the vulnerability to exist.
Each of the following must match for the vulnerability to exist.
Each of the following must match for the vulnerability to exist.