CVE-2022-36587 in Tenda
Summary
by MITRE • 09/07/2022
In Tenda G3 US_G3V3.0br_V15.11.0.6(7663)_EN_TDE, there is a buffer overflow vulnerability caused by sprintf in function in the httpd binary.
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Analysis
by VulDB Data Team • 06/17/2025
The vulnerability identified as CVE-2022-36587 affects the Tenda G3 US_G3V3.0br_V15.11.0.6(7663)_EN_TDE router firmware, specifically within the httpd binary component. This issue represents a critical buffer overflow vulnerability that stems from improper handling of string operations within the device's web server implementation. The flaw manifests when the sprintf function is invoked without adequate bounds checking, creating an exploitable condition that can be leveraged by remote attackers to execute arbitrary code on the affected device.
The technical implementation of this vulnerability resides in the httpd binary which processes incoming HTTP requests and handles various parameters through string manipulation functions. When user-supplied input is passed to the sprintf function without proper validation or length constraints, the destination buffer becomes susceptible to overflow conditions. This particular implementation flaw falls under the category of CWE-121, which describes stack-based buffer overflow conditions, and more specifically aligns with CWE-787, which addresses out-of-bounds write vulnerabilities. The vulnerability exists because the firmware fails to properly validate input lengths before performing string operations, allowing attackers to craft malicious payloads that exceed the allocated buffer space.
From an operational perspective, this vulnerability presents significant risks to network security as it allows remote code execution without authentication requirements. An attacker can exploit this condition by sending specially crafted HTTP requests containing overly long input strings to the affected router's web interface. The successful exploitation could enable attackers to gain full administrative control over the device, potentially leading to complete network compromise. The vulnerability impacts all users of the specific firmware version mentioned, making it a widespread concern for network administrators managing Tenda G3 devices. This type of vulnerability directly maps to ATT&CK technique T1059.007, which covers command and script interpreter execution through web shell capabilities, and T1068, which involves local privilege escalation through exploitation of software vulnerabilities.
The recommended mitigation strategies for CVE-2022-36587 include immediate firmware updates from Tenda to address the buffer overflow condition in the httpd binary. Network administrators should also implement network segmentation to limit exposure of affected devices and consider disabling unnecessary web services on the router. Additionally, monitoring network traffic for suspicious HTTP requests and implementing intrusion detection systems can help identify exploitation attempts. The vulnerability demonstrates the critical importance of proper input validation and bounds checking in embedded systems, particularly those handling network communications. Organizations should also conduct comprehensive vulnerability assessments of their network infrastructure to identify similar issues in other router models or firmware versions that may be susceptible to analogous buffer overflow conditions.