CVE-2024-8227 in Tenda
Summary
by MITRE • 08/28/2024
A vulnerability was found in Tenda O1 1.0.0.7(10648) and classified as critical. Affected by this issue is the function fromDhcpSetSer of the file /goform/DhcpSetSer. The manipulation of the argument dhcpStartIp/dhcpEndIp/dhcpGw/dhcpMask/dhcpLeaseTime/dhcpDns1/dhcpDns2 leads to stack-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. 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 • 08/29/2024
The vulnerability identified as CVE-2024-8227 represents a critical stack-based buffer overflow flaw in the Tenda O1 router firmware version 1.0.0.7(10648). This vulnerability exists within the DhcpSetSer function located in the /goform/DhcpSetSer file, which is part of the web-based administrative interface. The affected parameters include dhcpStartIp, dhcpEndIp, dhcpGw, dhcpMask, dhcpLeaseTime, dhcpDns1, and dhcpDns2, all of which can be manipulated by remote attackers to trigger the buffer overflow condition. The flaw stems from inadequate input validation and bounds checking within the firmware's DHCP configuration handling mechanism, creating an exploitable condition that allows attackers to overwrite adjacent memory locations on the stack.
The technical implementation of this vulnerability follows the characteristics of CWE-121 Stack-based Buffer Overflow, where insufficient bounds checking permits data to be written beyond the allocated buffer space. The attack vector is remotely accessible through the web interface, meaning that an unauthenticated attacker can exploit this vulnerability without requiring physical access to the device. The exploitability is heightened by the fact that the vulnerability has been publicly disclosed and is already in use by threat actors, making it a pressing concern for affected users. The stack-based nature of the overflow allows for potential arbitrary code execution, privilege escalation, or denial of service conditions that could compromise the entire network infrastructure managed by the affected router.
The operational impact of CVE-2024-8227 extends beyond simple device compromise, as the Tenda O1 router serves as a critical network gateway component in residential and small office environments. Successful exploitation could enable attackers to gain full administrative control over the device, potentially allowing them to modify network configurations, redirect traffic through malicious servers, or establish persistent backdoors within the network. The vulnerability's remote exploitability means that attackers can target multiple devices simultaneously without requiring physical presence, making it particularly dangerous for organizations with numerous affected devices. Network monitoring systems may not immediately detect such attacks as they could appear as legitimate administrative traffic, complicating detection and response efforts.
Mitigation strategies for this vulnerability should prioritize immediate firmware updates from Tenda if available, though the vendor's lack of response to early disclosure attempts presents a significant challenge. Network administrators should implement strict access controls limiting remote administrative access to the router's web interface and consider disabling unnecessary services. The principle of least privilege should be applied by ensuring that only authorized personnel have access to the administrative interface, and multi-factor authentication should be implemented where possible. Network segmentation and intrusion detection systems can help detect anomalous traffic patterns that may indicate exploitation attempts. Additionally, organizations should conduct thorough network assessments to identify all affected Tenda O1 devices and implement network monitoring to detect unauthorized modifications to DHCP configurations, as these changes could indicate successful exploitation attempts. The vulnerability's classification as critical according to CVSS v3.1 scores underscores the urgency of implementing these protective measures to prevent potential network-wide compromise.