CVE-2024-6965 in Tenda
Summary
by MITRE • 07/22/2024
A vulnerability has been found in Tenda O3 1.0.0.10 and classified as critical. Affected by this vulnerability is the function fromVirtualSet. The manipulation of the argument ip/localPort/publicPort/app leads to stack-based buffer overflow. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. The associated identifier of this vulnerability is VDB-272119. 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 • 07/26/2024
The vulnerability identified as CVE-2024-6965 represents a critical stack-based buffer overflow in Tenda O3 firmware version 1.0.0.10, specifically within the fromVirtualSet function. This flaw resides in the network configuration handling mechanism of the device's web interface, where user-supplied parameters are processed without adequate bounds checking. The affected parameters include ip, localPort, publicPort, and app, which are passed to the vulnerable function as arguments. The buffer overflow occurs when these parameters exceed the allocated stack buffer space, potentially allowing attackers to overwrite adjacent memory locations and execute arbitrary code. This vulnerability is particularly concerning as it affects the core network management functionality of the device, which is typically accessible through the web administration interface. The exploitation of this flaw can lead to complete system compromise, including unauthorized access to network resources and potential lateral movement within the affected network infrastructure.
The technical implementation of this vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which occurs when a program writes data beyond the bounds of a fixed-length stack buffer. The fromVirtualSet function appears to improperly handle user input parameters, failing to validate the length of strings passed to it. This allows an attacker to craft malicious input that exceeds the buffer capacity, causing a stack overflow condition. The remote exploitation capability means that an attacker does not need physical access to the device, as the vulnerability can be triggered through network-based attacks against the web interface. The fact that the exploit has been publicly disclosed and is potentially in use increases the risk profile significantly, as malicious actors can leverage this vulnerability without requiring advanced technical skills to develop custom exploits. The attack vector likely involves sending specially crafted HTTP requests containing oversized parameter values to the vulnerable web service endpoint, which then processes these parameters through the flawed fromVirtualSet function.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass complete device compromise and potential network infiltration. Successful exploitation could enable attackers to gain root access to the device, allowing them to modify network configurations, install persistent backdoors, or use the device as a pivot point for attacking other systems within the local network. The compromised device could then be used to conduct man-in-the-middle attacks, DNS poisoning, or other malicious activities that leverage the device's network position. Additionally, since the device is likely acting as a router or access point, the compromise could provide attackers with visibility into all network traffic passing through the device, potentially exposing sensitive data and credentials. The lack of vendor response to early disclosure attempts creates a particularly dangerous scenario where no official patches or mitigations are available, leaving affected users vulnerable to exploitation for an extended period. This situation aligns with ATT&CK technique T1071.001 for Application Layer Protocol: Web Protocols, as the attack leverages web-based interfaces to exploit the vulnerability.
Organizations and individuals affected by this vulnerability should immediately implement mitigations to reduce exposure risk. The most effective immediate action is to disable remote administration access to the device if possible, restricting access to local network connections only. Network segmentation should be implemented to limit the potential impact of a successful compromise, ensuring that even if one device is compromised, the attacker cannot easily move laterally through the network. Regular firmware updates should be monitored and applied as soon as vendor patches become available, though the current situation lacks official vendor response. Network monitoring should be enhanced to detect unusual traffic patterns that might indicate exploitation attempts, particularly focusing on HTTP requests containing malformed parameters. The vulnerability's classification as critical means that immediate action is required, as the public availability of exploits increases the likelihood of automated attacks targeting vulnerable devices. Security teams should also consider implementing intrusion detection systems that can identify attempts to exploit this specific vulnerability pattern, given its alignment with well-known exploitation techniques and the documented presence of public exploit code.