CVE-2025-29385 in AC9
Summary
by MITRE • 03/14/2025
In Tenda AC9 v1.0 V15.03.05.14_multi, the cloneType parameter of /goform/AdvSetMacMtuWan has a stack overflow vulnerability, which can lead to remote arbitrary code execution.
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Analysis
by VulDB Data Team • 06/02/2025
The vulnerability identified as CVE-2025-29385 affects the Tenda AC9 v1.0 V15.03.05.14_multi firmware, representing a critical stack overflow flaw within the web interface management component. This issue manifests in the /goform/AdvSetMacMtuWan endpoint where the cloneType parameter fails to properly validate input length, creating a condition where maliciously crafted data can overflow the allocated stack buffer. The affected device operates under a web-based administrative interface that processes form data through the goform framework, making it susceptible to injection attacks that exploit memory corruption vulnerabilities.
The technical nature of this vulnerability aligns with CWE-121 Stack-based Buffer Overflow, where insufficient bounds checking allows an attacker to overwrite adjacent memory locations on the stack. The cloneType parameter specifically lacks proper input sanitization and length validation, enabling attackers to supply oversized input data that exceeds the predetermined buffer size allocated for this parameter. This flaw occurs during the processing of administrative requests through the web interface, where user-supplied parameters are directly used without adequate validation mechanisms to prevent buffer overflow conditions.
From an operational perspective, this vulnerability presents a severe risk as it enables remote arbitrary code execution without requiring authentication, making it particularly dangerous for networked devices. Attackers can leverage this weakness to execute malicious code on the affected router, potentially gaining full control over the device's operations and network access. The attack surface expands significantly since the vulnerability exists within the web management interface, which is typically accessible from external networks, allowing exploitation from remote locations without physical access to the device.
The impact of this vulnerability extends beyond simple device compromise, as it can facilitate broader network infiltration and lateral movement within compromised networks. Once an attacker gains control through this vulnerability, they can manipulate network traffic, redirect connections, or establish persistent access points for further exploitation. The device's role as a network gateway makes it a prime target for attackers seeking to establish footholds within larger network infrastructures, potentially enabling more sophisticated attacks such as man-in-the-middle operations or denial-of-service conditions.
Mitigation strategies should focus on immediate firmware updates from Tenda to address the buffer overflow condition and implement proper input validation for all form parameters. Network administrators should consider implementing network segmentation and access controls to limit exposure of administrative interfaces to trusted networks only. Additionally, monitoring for unusual traffic patterns or unauthorized access attempts to the affected endpoint can help detect exploitation attempts. The vulnerability demonstrates the importance of input validation and memory safety practices in embedded web interfaces, aligning with ATT&CK technique T1210 for exploitation of remote services and T1059 for command and control execution. Organizations should also consider implementing web application firewalls to detect and block malformed requests targeting the vulnerable endpoint, while ensuring that all network devices receive regular security updates to prevent similar vulnerabilities from being exploited in the future.