CVE-2022-37067 in GR-1200W
Summary
by MITRE • 08/25/2022
H3C GR-1200W MiniGRW1A0V100R006 was discovered to contain a stack overflow via the function UpdateWanParamsMulti.
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Analysis
by VulDB Data Team • 10/01/2022
The vulnerability identified as CVE-2022-37067 affects H3C GR-1200W MiniGRW1A0V100R006 wireless routers, representing a critical stack overflow condition that could enable remote code execution. This issue stems from improper input validation within the UpdateWanParamsMulti function, which processes WAN parameter updates through the device's web interface. The flaw allows attackers to craft malicious payloads that overwrite stack memory locations, potentially leading to arbitrary code execution with system-level privileges. Such vulnerabilities are particularly dangerous in network infrastructure devices as they can serve as entry points for broader network compromise.
The technical implementation of this vulnerability involves a classic buffer overflow scenario where the UpdateWanParamsMulti function fails to properly validate the length of input data before copying it to a fixed-size stack buffer. This function handles parameters related to WAN configuration, including IP addresses, subnet masks, and gateway settings. When an attacker sends a specially crafted HTTP request containing excessively long parameter values, the function does not perform adequate bounds checking, allowing the overflow to occur. The stack-based nature of this vulnerability means that the overflow can overwrite return addresses, function pointers, and other critical stack data structures, enabling attackers to redirect execution flow.
The operational impact of CVE-2022-37067 extends beyond simple denial of service scenarios, as successful exploitation could provide attackers with complete control over the affected router. This includes the ability to modify network configurations, redirect traffic through malicious proxies, establish persistent backdoors, and potentially use the compromised device as a pivot point for attacking other network segments. The vulnerability affects a specific hardware model and firmware version, but given the widespread deployment of H3C routers in enterprise and residential networks, the potential attack surface remains significant. Network administrators should be particularly concerned about the possibility of attackers using this vulnerability to create persistent access points within networks.
Security professionals should consider this vulnerability in the context of the CWE-121 stack-based buffer overflow category, which is classified under the Common Weakness Enumeration framework as a fundamental flaw in memory management practices. The ATT&CK framework would categorize this vulnerability under T1059.007 for command and script interpreter execution, as exploitation could enable attackers to execute arbitrary commands on the device. Mitigation strategies should include immediate firmware updates from H3C, network segmentation to limit exposure, and monitoring for unusual WAN parameter changes. Additionally, implementing web application firewalls and network intrusion detection systems can help identify and block exploitation attempts targeting this specific vulnerability.