CVE-2022-35219 in Card
Summary
by MITRE • 08/02/2022
The NHI card’s web service component has a stack-based buffer overflow vulnerability due to insufficient validation for network packet key parameter. A LAN attacker with general user privilege can exploit this vulnerability to disrupt service.
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Analysis
by VulDB Data Team • 08/03/2022
The vulnerability identified as CVE-2022-35219 affects the web service component of NHI cards, representing a critical stack-based buffer overflow flaw that stems from inadequate validation of network packet key parameters. This issue resides within the service layer that processes incoming network communications, creating an exploitable condition that can be leveraged by malicious actors within the local network environment. The vulnerability's presence in the web service component suggests a fundamental flaw in input sanitization and memory management practices, where the system fails to properly validate the length and content of key parameters received through network packets.
The technical exploitation of this vulnerability occurs when an attacker crafts malicious network packets containing oversized or malformed key parameters that exceed the allocated buffer space. This buffer overflow condition enables the attacker to overwrite adjacent memory locations on the stack, potentially leading to arbitrary code execution or service disruption. The attack vector specifically targets the local network environment, meaning that an attacker must already have network access and general user privileges to successfully exploit the vulnerability, though this access requirement does not necessarily limit the potential impact. The vulnerability's classification aligns with CWE-121 Stack-based Buffer Overflow, which describes a condition where insufficient bounds checking allows attackers to write beyond the boundaries of allocated stack memory.
From an operational standpoint, this vulnerability presents a significant risk to service availability and system integrity within local network environments where NHI cards are deployed. The disruption potential extends beyond simple service interruption to encompass possible data corruption or unauthorized access to sensitive information processed by the web service component. Network administrators and security teams must recognize that even users with general privileges can potentially exploit this condition, making the attack surface more expansive than initially apparent. The impact assessment reveals that while the vulnerability requires local network access, the potential for service disruption and data compromise makes it a high-priority concern for organizations relying on NHI card infrastructure.
Mitigation strategies should focus on immediate input validation improvements and comprehensive code review processes to address the root cause of insufficient parameter validation. Implementing proper bounds checking for all network packet parameters, combined with input sanitization mechanisms, would effectively prevent the buffer overflow condition from occurring. Network segmentation and access controls can provide additional layers of defense by limiting the attack surface and reducing the likelihood of successful exploitation. Organizations should also consider implementing intrusion detection systems that monitor for anomalous network packet patterns that might indicate exploitation attempts. The remediation approach aligns with ATT&CK technique T1071.004 Application Layer Protocol: DNS, where network monitoring and validation of protocol parameters play a crucial role in preventing exploitation of similar vulnerabilities. Regular security assessments and vulnerability scanning should be conducted to identify potential variants of this class of vulnerability within the broader network infrastructure, ensuring comprehensive protection against similar buffer overflow conditions.