CVE-2022-36474 in B5 Mini
Summary
by MITRE • 08/25/2022
H3C B5 Mini B5MiniV100R005 was discovered to contain a stack overflow via the function WlanWpsSet.
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Analysis
by VulDB Data Team • 08/25/2022
The vulnerability identified as CVE-2022-36474 affects H3C B5 Mini B5MiniV100R005 wireless access point devices, representing a critical stack overflow condition that can be exploited through the WlanWpsSet function. This flaw resides within the device's wireless provisioning service implementation and demonstrates a classic buffer management failure that can lead to arbitrary code execution. The vulnerability specifically manifests when the device processes certain input parameters through the WlanWpsSet function, which is responsible for configuring wireless provisioning settings. The stack overflow occurs due to insufficient bounds checking on user-supplied data, allowing an attacker to overwrite adjacent memory locations on the program stack.
This vulnerability falls under CWE-121 Stack-based Buffer Overflow, which is classified as a fundamental memory safety issue in software development practices. The attack vector leverages the device's wireless provisioning protocol implementation, where the WlanWpsSet function fails to properly validate input length before copying data into fixed-size buffers. The operational impact of this vulnerability extends beyond simple denial of service, as it can enable remote code execution and complete system compromise. An attacker exploiting this flaw could gain unauthorized access to the device's administrative interface, potentially leading to network infiltration, data exfiltration, or the establishment of persistent backdoors within the affected network infrastructure.
The security implications of CVE-2022-36474 align with ATT&CK technique T1210 Exploitation of Remote Services, as the vulnerability allows for remote exploitation without requiring physical access to the device. The affected H3C B5 Mini B5MiniV100R005 model represents a common enterprise-grade wireless access point that typically operates in unsecured environments, making it an attractive target for attackers seeking to establish network footholds. The device's wireless provisioning functionality is often exposed to external networks, particularly when configured with default settings or when administrators fail to properly isolate wireless management interfaces. This exposure creates an attack surface that can be leveraged by threat actors to execute malicious payloads, potentially affecting thousands of devices within a single network segment.
Mitigation strategies for this vulnerability should include immediate firmware updates from H3C to address the buffer overflow condition in the WlanWpsSet function. Network administrators should implement strict access controls limiting wireless management interface access to trusted network segments and employ network segmentation techniques to isolate critical infrastructure from general network traffic. Additional protective measures include disabling unnecessary wireless provisioning services when not actively required, implementing network monitoring to detect anomalous traffic patterns associated with exploitation attempts, and conducting regular vulnerability assessments to identify similar flaws in network infrastructure components. The remediation process should also involve reviewing and updating security policies to ensure proper network access controls and monitoring procedures are in place to prevent unauthorized access to wireless network management interfaces.