CVE-2019-13154 in TEW-827DRU
Summary
by MITRE
An issue was discovered in TRENDnet TEW-827DRU firmware before 2.05B11. There is a command injection in apply.cgi (exploitable with authentication) via the TCP Ports To Open in Add Gaming Rule.
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Analysis
by VulDB Data Team • 10/15/2023
The vulnerability CVE-2019-13154 represents a critical command injection flaw within the TRENDnet TEW-827DRU wireless router firmware version 2.05B10 and earlier. This issue resides in the apply.cgi script which processes user input through the TCP Ports To Open field when configuring Add Gaming Rule functionality. The vulnerability becomes exploitable only when an attacker possesses valid authentication credentials, making it a authenticated remote code execution vector that could potentially allow adversaries to execute arbitrary commands on the affected device.
The technical implementation of this vulnerability stems from inadequate input validation and sanitization within the web interface of the router's firmware. When users attempt to add gaming rules through the web management interface, the TCP Ports To Open parameter is directly incorporated into system commands without proper escaping or filtering of special characters. This design flaw allows attackers who have already authenticated to the device to inject malicious commands that get executed by the underlying operating system, potentially leading to complete system compromise.
From an operational perspective, this vulnerability poses significant risks to network security as it enables authenticated attackers to gain unauthorized control over the router's functionality. The attacker could potentially modify firewall rules, redirect traffic, access sensitive network information, or even install malicious software on the device. The impact extends beyond the immediate device compromise as compromised routers can serve as entry points for broader network infiltration, making this vulnerability particularly dangerous in enterprise environments where network segmentation relies on proper firewall configuration.
The vulnerability aligns with CWE-77 and CWE-94 categories under the Common Weakness Enumeration framework, specifically addressing command injection flaws that occur when user-supplied data is improperly handled in system command execution contexts. This vulnerability also maps to several ATT&CK techniques including T1059.001 for command and script interpreter and T1068 for exploit for privilege escalation, as the initial compromise requires authentication but can lead to elevated privileges within the device's operational context. Network administrators should prioritize patching this vulnerability by upgrading to firmware version 2.05B11 or later, implementing network segmentation to limit access to administrative interfaces, and monitoring for suspicious network activity that might indicate exploitation attempts.