CVE-2025-29040 in DIR-832x
Summary
by MITRE • 04/17/2025
An issue in dlink DIR 832x 240802 allows a remote attacker to execute arbitrary code via the target_addr key value and the function 0x41737c
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Analysis
by VulDB Data Team • 04/17/2025
The vulnerability identified as CVE-2025-29040 affects D-Link DIR-832x routers running firmware version 240802, presenting a critical remote code execution flaw that enables attackers to gain unauthorized system control. This vulnerability resides within the router's web management interface handling of network address parameters, specifically targeting the target_addr key value which when manipulated can trigger arbitrary code execution through the function at address 0x41737c. The flaw represents a classic buffer overflow condition where improper input validation allows attackers to inject malicious code into the router's memory space, potentially leading to complete system compromise and persistent backdoor access.
The technical implementation of this vulnerability involves a stack-based buffer overflow occurring during the processing of network address parameters within the router's firmware. When an attacker crafts a malicious request containing a specially formatted target_addr value, the system fails to properly validate the input length and content, allowing the overflow to occur at the memory location corresponding to function 0x41737c. This function appears to handle network address resolution or packet processing, and the overflow creates a condition where attacker-controlled data can overwrite return addresses and execution pointers within the stack. The vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which specifically addresses buffer overflows where data written to a stack buffer can overwrite adjacent memory locations including function return addresses.
Operationally, this vulnerability presents a severe threat to network security as it enables remote code execution without requiring authentication or physical access to the device. An attacker can leverage this flaw to execute arbitrary commands on the affected router, potentially gaining complete administrative control over the network infrastructure. The implications extend beyond simple device compromise, as compromised routers can serve as launching points for broader network attacks, including man-in-the-middle operations, DNS hijacking, or as part of botnet formations. This vulnerability particularly affects enterprise and home networks where routers serve as critical gateway devices, making the potential impact substantial for organizations relying on D-Link DIR-832x models.
The attack surface for this vulnerability is extensive given the widespread deployment of D-Link DIR-832x routers in both residential and commercial environments. Network administrators should consider the ATT&CK framework's T1059.007 technique for Command and Scripting Interpreter: Python, as attackers may leverage this vulnerability to establish persistent access through Python-based backdoors or command execution scripts. The vulnerability also maps to T1071.004 Application Layer Protocol: DNS, since compromised routers can be used to manipulate DNS resolution and redirect traffic. Mitigation strategies should include immediate firmware updates from D-Link, network segmentation to limit exposure, and implementation of intrusion detection systems monitoring for suspicious parameter manipulation patterns. Additionally, organizations should consider disabling unnecessary web management interfaces and implementing strict access controls to reduce the attack surface available to potential exploiters.