CVE-2022-37095 in H200
Summary
by MITRE • 08/25/2022
H3C H200 H200V100R004 was discovered to contain a stack overflow via the function UpdateWanParams.
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Analysis
by VulDB Data Team • 10/01/2022
The vulnerability identified as CVE-2022-37095 affects H3C H200 and H200V100R004 network devices, representing a critical stack overflow condition that stems from improper input validation within the UpdateWanParams function. This flaw exists within the device's firmware implementation and demonstrates a classic software security weakness that can be exploited to compromise the device's operational integrity. The stack overflow vulnerability occurs when the device processes WAN parameter updates without adequate bounds checking, allowing malicious input to overwrite adjacent memory locations on the stack. Such memory corruption can lead to arbitrary code execution or complete device compromise, making this vulnerability particularly dangerous for network infrastructure components.
The technical implementation of this vulnerability resides in the UpdateWanParams function which handles WAN configuration parameters received through network management interfaces. When processing user-supplied input for WAN parameters, the function fails to validate the length or content of incoming data before copying it to a fixed-size stack buffer. This classic buffer overflow condition allows an attacker to craft malicious input that exceeds the allocated buffer space, causing a stack overwrite that can be manipulated to redirect program execution flow. The vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and represents a direct violation of secure coding practices that mandate proper input validation and bounds checking. The attack vector typically involves sending specially crafted network management requests to the device's administrative interface, where the vulnerable function processes the malformed input.
The operational impact of CVE-2022-37095 extends beyond simple device compromise to encompass potential network-wide disruption and unauthorized access to sensitive infrastructure. An attacker who successfully exploits this vulnerability can gain administrative control over the affected H3C device, potentially enabling them to modify network configurations, redirect traffic, or establish persistent backdoors within the network perimeter. The implications are particularly severe given that H3C devices are commonly deployed in enterprise and service provider environments where they serve as critical network gateways and traffic management points. From an ATT&CK framework perspective, this vulnerability maps to techniques such as T1059.007 for command and control through device management interfaces and T1566 for initial access via network-based exploitation. The device's stack overflow can also facilitate privilege escalation attacks, allowing attackers to move laterally within the network and potentially compromise additional systems that rely on the compromised device for connectivity.
Mitigation strategies for CVE-2022-37095 should prioritize immediate firmware updates from H3C, as the vendor has likely released patches addressing this specific vulnerability. Network administrators must implement network segmentation and access controls to limit exposure of affected devices to untrusted networks, while also monitoring for unusual network management traffic patterns that might indicate exploitation attempts. The implementation of intrusion detection systems with signatures for known exploitation patterns related to this vulnerability can provide early warning capabilities. Additionally, organizations should conduct comprehensive vulnerability assessments to identify all instances of affected H3C devices within their network infrastructure and ensure that management interfaces are properly secured with strong authentication mechanisms. Regular security audits of network device configurations and continuous monitoring of device logs for unauthorized configuration changes are essential defensive measures that complement the firmware update remediation efforts.