CVE-2022-44253 in LR350
Summary
by MITRE • 11/23/2022
TOTOLINK LR350 V9.3.5u.6369_B20220309 contains a post-authentication buffer overflow via parameter ip in the setDiagnosisCfg function.
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Analysis
by VulDB Data Team • 04/25/2025
The vulnerability identified as CVE-2022-44253 affects the TOTOLINK LR350 router firmware version V9.3.5u.6369_B20220309, representing a critical buffer overflow flaw that can be exploited through a post-authentication attack vector. This vulnerability resides within the setDiagnosisCfg function of the device's web interface, where the ip parameter is improperly handled without adequate bounds checking or input validation. The flaw allows an attacker who has already established authentication credentials to send maliciously crafted input data to the ip parameter, which can then trigger a buffer overflow condition that may lead to arbitrary code execution or system instability.
The technical nature of this vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The attack scenario requires an authenticated user to exploit this vulnerability, making it a post-authentication issue that reduces the attack surface compared to pre-authentication flaws but still poses significant risks. The setDiagnosisCfg function likely processes network configuration data through the ip parameter, and when this parameter receives input exceeding the allocated buffer size, it overflows into adjacent memory regions, potentially allowing attackers to overwrite critical program execution flow control data such as return addresses or function pointers.
The operational impact of this vulnerability extends beyond simple denial of service conditions, as it can enable remote code execution capabilities when properly exploited. Attackers can leverage this flaw to gain unauthorized access to the router's operating system, potentially leading to complete system compromise. The vulnerability affects the device's web management interface, making it accessible over the network and allowing attackers to perform malicious operations without requiring physical access to the device. This post-authentication requirement does not eliminate the severity, as attackers who have obtained valid credentials through other means can utilize this vulnerability to escalate their privileges or maintain persistent access to the network infrastructure.
Mitigation strategies for CVE-2022-44253 should prioritize firmware updates from TOTOLINK to address the buffer overflow condition in the setDiagnosisCfg function. Network administrators should implement strict access controls and authentication measures to prevent unauthorized access to router management interfaces, as the vulnerability requires valid credentials to exploit. The implementation of web application firewalls and input validation mechanisms can provide additional layers of protection against malicious input attempts. Security monitoring should include detection of unusual parameter values being submitted to router management interfaces, particularly focusing on network configuration parameters that may be vulnerable to buffer overflow attacks. Organizations should also consider segmenting network access to limit the potential impact of compromised router credentials and implement regular security assessments to identify similar vulnerabilities in network infrastructure devices.
The vulnerability demonstrates how even authenticated access paths can present significant security risks when proper input validation is absent from web application components. This aligns with ATT&CK technique T1210 which covers exploitation of remote services through buffer overflow attacks, and the broader category of privilege escalation attacks that can occur when authentication boundaries are compromised. The presence of such vulnerabilities in consumer-grade networking equipment highlights the importance of secure coding practices and regular security updates for all network infrastructure components, regardless of their perceived security posture or target audience.