CVE-2022-34603 in Magic R200
Summary
by MITRE • 07/20/2022
H3C Magic R200 R200V200R004L02 was discovered to contain a stack overflow via the DelDNSHnList interface at /goform/aspForm.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 08/15/2022
The vulnerability identified as CVE-2022-34603 affects the H3C Magic R200 R200V200R004L02 network device firmware, specifically targeting the DelDNSHnList interface within the web management system. This issue represents a critical stack overflow vulnerability that can be exploited through the /goform/aspForm endpoint, potentially allowing attackers to execute arbitrary code on the affected device. The vulnerability resides in the handling of user-supplied input within the DNS host name list deletion functionality, where insufficient bounds checking permits malicious data to overwrite adjacent memory locations on the stack.
The technical flaw manifests when the device processes requests to the DelDNSHnList interface without adequate validation of input parameters. When an attacker sends a specially crafted request containing excessive data to the /goform/aspForm endpoint, the application fails to properly validate the length of the input before copying it to a fixed-size buffer on the stack. This classic buffer overflow condition creates an opportunity for attackers to overwrite return addresses and function pointers, potentially enabling remote code execution with the privileges of the web server process. The vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows data to overwrite adjacent stack memory locations.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it can enable complete compromise of the network device. An attacker with remote access to the device could potentially gain unauthorized administrative access, modify network configurations, redirect traffic, or establish persistent backdoors. The device's role as a network gateway makes this vulnerability particularly dangerous, as it could serve as a foothold for broader network infiltration attacks. The attack surface is further expanded by the fact that the vulnerability can be exploited through web-based interfaces, requiring no physical access to the device and enabling exploitation from external networks.
Mitigation strategies should focus on immediate firmware updates from H3C to address the identified stack overflow vulnerability, as well as network-level controls to restrict access to administrative interfaces. Organizations should implement network segmentation to limit exposure of the affected device to untrusted networks, deploy intrusion detection systems to monitor for exploitation attempts, and establish secure remote access protocols with strong authentication mechanisms. The vulnerability demonstrates the importance of input validation and memory safety practices in embedded network devices, aligning with ATT&CK technique T1059.007 for execution through web shells and T1071.004 for application layer protocols. Network administrators should also consider implementing web application firewalls to filter malicious requests targeting the vulnerable endpoint and establish regular vulnerability assessment procedures to identify similar issues in other network infrastructure components.