CVE-2024-33211 in FH1206
Summary
by MITRE • 04/23/2024
Tenda FH1206 V1.2.0.8(8155)_EN was discovered to contain a stack-based buffer overflow vulnerability via the PPPOEPassword parameter in ip/goform/QuickIndex.
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Analysis
by VulDB Data Team • 03/18/2025
The vulnerability identified as CVE-2024-33211 affects the Tenda FH1206 router firmware version V1.2.0.8(8155)_EN, representing a critical stack-based buffer overflow condition that arises from improper input validation within the web interface handling mechanism. This issue specifically manifests when processing the PPPOEPassword parameter through the ip/goform/QuickIndex endpoint, creating a potential attack vector that could allow remote code execution or system compromise. The vulnerability stems from insufficient bounds checking and memory management practices within the affected firmware, enabling attackers to overflow the stack buffer and potentially overwrite critical program execution data.
The technical exploitation of this vulnerability involves sending a maliciously crafted HTTP request containing an excessively long PPPOEPassword value to the targeted router's web interface. This parameter is processed through the QuickIndex form handler which fails to properly validate the input length before copying it into a fixed-size stack buffer. According to CWE-121, this represents a classic stack-based buffer overflow condition where the attacker can manipulate the program flow by overwriting return addresses and other critical stack data. The vulnerability aligns with ATT&CK technique T1210 which describes exploitation of remote services through buffer overflow attacks, particularly targeting network infrastructure devices.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as it could enable attackers to achieve arbitrary code execution on the affected router. Successful exploitation might allow threat actors to gain persistent access to the network infrastructure, potentially leading to man-in-the-middle attacks, traffic interception, or use of the compromised device as a pivot point for lateral movement within the network. The router's web interface serves as the primary attack surface, making this vulnerability particularly dangerous as it requires no physical access to the device and can be exploited remotely over the network.
Mitigation strategies for CVE-2024-33211 should prioritize immediate firmware updates from Tenda to address the buffer overflow condition in the affected firmware version. Network administrators should implement network segmentation and access controls to limit exposure of affected devices to untrusted networks. Additional protective measures include disabling unnecessary web interfaces, implementing robust network monitoring for suspicious traffic patterns, and conducting regular vulnerability assessments of network infrastructure. The vulnerability highlights the importance of proper input validation and secure coding practices as outlined in OWASP Top 10 and NIST cybersecurity guidelines, particularly emphasizing the need for bounds checking in memory operations and proper error handling in web application frameworks.