CVE-2024-0991 in Tenda
Summary
by MITRE • 01/29/2024
A vulnerability has been found in Tenda i6 1.0.0.9(3857) and classified as critical. This vulnerability affects the function formSetCfm of the file /goform/setcfm of the component httpd. The manipulation of the argument funcpara1 leads to stack-based buffer overflow. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-252256. 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 • 02/21/2024
The vulnerability identified as CVE-2024-0991 represents a critical stack-based buffer overflow flaw in Tenda i6 router firmware version 1.0.0.9(3857) affecting the httpd web server component. This vulnerability exists within the formSetCfm function located in the /goform/setcfm file path, making it accessible through the web interface of the affected device. The flaw specifically manifests when processing the funcpara1 argument, which allows an attacker to manipulate input data that exceeds the allocated buffer space on the stack, potentially leading to arbitrary code execution or system compromise.
The technical implementation of this vulnerability stems from improper input validation and memory management within the httpd component of the router's web interface. When an attacker sends a specially crafted request containing excessive data in the funcpara1 parameter, the system fails to properly bounds-check the input before copying it into a fixed-size stack buffer. This classic buffer overflow condition creates an opportunity for attackers to overwrite adjacent stack memory, potentially corrupting program execution flow and allowing for privilege escalation or remote code execution. The vulnerability's classification as remotely exploitable means that no authentication is required to initiate the attack, making it particularly dangerous for devices accessible over the internet.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as it presents a significant risk to network security infrastructure. Given that routers serve as fundamental network gateways, exploitation of this flaw could provide attackers with complete control over the affected device, potentially enabling them to redirect traffic, intercept communications, or use the compromised device as a pivot point for attacking other systems within the network. The fact that a public exploit has been disclosed increases the likelihood of widespread exploitation, as malicious actors can immediately leverage this vulnerability without requiring advanced technical knowledge or extensive research. This makes the vulnerability particularly concerning for enterprise and home users who may not have updated their firmware or implemented proper network segmentation.
Security professionals should consider this vulnerability in the context of the MITRE ATT&CK framework, specifically mapping it to techniques involving privilege escalation and remote code execution. The vulnerability aligns with CWE-121 stack-based buffer overflow classification, which represents one of the most common and dangerous types of memory corruption vulnerabilities. Organizations should immediately implement network segmentation strategies to isolate affected devices, disable unnecessary remote access to router interfaces, and deploy network monitoring solutions to detect potential exploitation attempts. The lack of vendor response to early disclosure attempts further compounds the risk, as users may not receive timely patches or updates to address this critical vulnerability, highlighting the importance of proactive security measures and alternative mitigation strategies for devices with known critical vulnerabilities.