CVE-2024-34087 in BPQ32
Summary
by MITRE • 08/26/2024
An SEH-based buffer overflow in the BPQ32 HTTP Server in BPQ32 6.0.24.1 allows remote attackers with access to the Web Terminal to achieve remote code execution via an HTTP POST /TermInput request.
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Analysis
by VulDB Data Team • 08/29/2024
The vulnerability identified as CVE-2024-34087 represents a critical security flaw within the BPQ32 HTTP Server component version 6.0.24.1. This issue manifests as an SEH-based buffer overflow that occurs when processing HTTP POST requests to the /TermInput endpoint, creating a significant attack surface for malicious actors who have gained access to the Web Terminal interface. The BPQ32 software serves as a packet radio gateway and communication server widely used in amateur radio and emergency communication networks, making this vulnerability particularly concerning for organizations relying on such infrastructure. The SEH (Structured Exception Handling) overflow specifically indicates that the vulnerability exploits the Windows exception handling mechanism, where an attacker can manipulate the exception handler chain to redirect execution flow and ultimately achieve arbitrary code execution on the affected system.
The technical exploitation of this vulnerability requires an attacker to first obtain access to the Web Terminal interface, which provides a foothold within the system's administrative access layer. Once inside this terminal environment, the attacker can craft a specially formatted HTTP POST request to the /TermInput endpoint that triggers the buffer overflow condition. The SEH-based nature of this vulnerability means that the overflow occurs within the exception handling code path, allowing attackers to overwrite exception handler pointers or stack-based exception information structures. This manipulation can lead to complete control over the program execution flow, enabling attackers to inject and execute malicious code with the privileges of the BPQ32 service account. The attack vector specifically targets the HTTP server component's handling of terminal input processing, where insufficient bounds checking allows memory corruption that can be leveraged for remote code execution.
The operational impact of this vulnerability extends beyond simple remote code execution, as it compromises the integrity and availability of critical communication infrastructure. Organizations utilizing BPQ32 for emergency services, amateur radio operations, or specialized communication networks face potential disruption of their communication systems, data exfiltration, and complete system compromise. The vulnerability affects the server's ability to maintain secure communication channels and could potentially allow attackers to intercept, modify, or redirect communication traffic between radio nodes. The fact that this requires only Web Terminal access means that the attack surface is relatively small compared to vulnerabilities requiring full network access, making it particularly dangerous for systems where administrative access might be more readily available than network-level access. The exploitation of such a vulnerability could result in widespread communication failures across networks relying on BPQ32 infrastructure, potentially affecting emergency response systems and amateur radio operations.
Mitigation strategies for CVE-2024-34087 should prioritize immediate patching of affected BPQ32 installations to version 6.0.24.2 or later, which contains the necessary fixes for the SEH-based buffer overflow. Network segmentation and access control measures should be implemented to restrict access to the Web Terminal interface, limiting the attack surface to authorized personnel only. Implementing robust monitoring and logging of HTTP requests to the /TermInput endpoint can help detect potential exploitation attempts, while regular security assessments should be conducted to identify unauthorized access to administrative interfaces. The vulnerability aligns with CWE-121, which describes heap-based and stack-based buffer overflow conditions, and may also relate to CWE-129, concerning improper validation of array indices. From an ATT&CK perspective, this vulnerability maps to T1210 - Exploitation of Remote Services and T1059 - Command and Scripting Interpreter, as it enables remote code execution through HTTP service exploitation and command execution capabilities. Organizations should also consider implementing network-based intrusion detection systems to monitor for suspicious HTTP POST patterns targeting the affected endpoint, ensuring that any exploitation attempts are quickly identified and responded to.