CVE-2024-7183 in A3600R
Summary
by MITRE • 07/29/2024
A vulnerability, which was classified as critical, was found in TOTOLINK A3600R 4.1.2cu.5182_B20201102. Affected is the function setUploadSetting of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument FileName leads to buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-272604. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 08/23/2024
The vulnerability identified as CVE-2024-7183 represents a critical buffer overflow flaw within the TOTOLINK A3600R router firmware version 4.1.2cu.5182_B20201102. This security weakness resides in the setUploadSetting function of the /cgi-bin/cstecgi.cgi web interface component, making it accessible through remote network exploitation. The vulnerability specifically manifests when processing the FileName argument, which allows attackers to manipulate input parameters beyond the allocated buffer boundaries. This type of flaw falls under the Common Weakness Enumeration category CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking permits attackers to overwrite adjacent memory locations. The affected device operates with a web-based management interface that processes user inputs through the cgi-bin scripting interface, creating a direct attack surface for remote exploitation. The buffer overflow vulnerability creates potential for arbitrary code execution within the router's memory space, as attackers can overwrite critical program execution pointers and control flow mechanisms.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass complete system compromise of the affected router. Attackers can leverage this buffer overflow to gain unauthorized access to the device's operating system, potentially enabling them to modify network configurations, install malicious software, or establish persistent backdoors for future access. The remote exploitation capability eliminates the need for physical access to the device, making this vulnerability particularly dangerous in networked environments where routers serve as critical infrastructure components. Network traffic interception and manipulation becomes possible once an attacker successfully exploits this vulnerability, as the compromised router can be used to redirect traffic, perform man-in-the-middle attacks, or serve as a pivot point for further network infiltration. The vulnerability's classification as critical indicates that it can be exploited without authentication and requires minimal technical expertise, making it attractive to both skilled and amateur attackers. This type of attack vector aligns with ATT&CK technique T1071.004 for application layer protocol usage and T1059.001 for command and scripting interpreter, as attackers can execute commands through the compromised web interface.
The exploitation of CVE-2024-7183 demonstrates a significant gap in the security posture of consumer and enterprise networking equipment, particularly regarding input validation and memory management practices. The fact that the vulnerability has been publicly disclosed and is known to be exploitable indicates that threat actors are actively targeting devices running this firmware version. The lack of vendor response to early disclosure attempts suggests potential delays in security patch development or inadequate vulnerability management processes within the vendor's security operations. Organizations should immediately implement network segmentation measures to isolate affected devices and monitor for suspicious network activity patterns that might indicate exploitation attempts. The vulnerability represents a classic example of insufficient input validation that allows attackers to manipulate memory structures through crafted input parameters, making it a prime candidate for automated exploitation tools targeting the specific firmware version. Security professionals should consider this vulnerability as part of broader network reconnaissance efforts, particularly when identifying legacy or unsupported network equipment that may contain similar memory corruption flaws. The disclosure of this vulnerability highlights the importance of regular firmware updates and vulnerability assessments for network infrastructure components, as many organizations may not be aware of the security status of their networking equipment. Given the nature of the vulnerability, network administrators should implement intrusion detection systems capable of identifying malicious traffic patterns associated with buffer overflow exploitation attempts and consider deploying network access control measures to limit exposure of vulnerable devices to untrusted networks.