CVE-2024-32305 in A18
Summary
by MITRE • 04/17/2024
Tenda A18 v15.03.05.05 firmware has a stack overflow vulnerability located via the PPW parameter in the fromWizardHandle function.
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Analysis
by VulDB Data Team • 11/06/2024
The vulnerability identified as CVE-2024-32305 represents a critical stack overflow flaw within the Tenda A18 v15.03.05.05 firmware implementation. This issue manifests specifically within the fromWizardHandle function where the PPW parameter is processed without adequate input validation or bounds checking. The stack overflow vulnerability arises from insufficient sanitization of user-supplied data, creating an exploitable condition that can be leveraged by remote attackers to execute arbitrary code on the affected device.
From a technical perspective, the vulnerability stems from improper handling of the PPW parameter which is likely used in the context of wizard-based configuration processes. When malicious input is passed through this parameter, the firmware fails to properly validate the input length or content before processing it on the stack. This lack of input sanitization creates a classic buffer overflow condition where attacker-controlled data can overwrite adjacent stack memory locations. The vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which specifically addresses buffer overflows occurring in stack memory regions due to insufficient bounds checking.
The operational impact of this vulnerability extends beyond simple denial of service scenarios. A remote attacker capable of sending crafted requests to the affected device could potentially execute arbitrary code with elevated privileges, effectively compromising the entire router. This could lead to complete system takeover, allowing attackers to establish persistent backdoors, modify network configurations, or redirect traffic through malicious proxies. The implications are particularly severe given that routers serve as central network hubs and often contain sensitive configuration data and network credentials.
Security professionals should note that this vulnerability falls under the ATT&CK framework category of TA0002 Execution and TA0003 Persistence, as successful exploitation would enable attackers to execute malicious code and establish long-term access to the network infrastructure. The attack surface is particularly concerning because the vulnerability is accessible via network-based attacks without requiring physical access to the device. Mitigation strategies should include immediate firmware updates from Tenda, network segmentation to limit access to affected devices, and implementing intrusion detection systems to monitor for exploitation attempts. Additionally, network administrators should consider disabling unnecessary services and applying firewall rules to restrict access to the affected device's administrative interfaces.