CVE-2022-44257 in LR350
Summary
by MITRE • 11/23/2022
TOTOLINK LR350 V9.3.5u.6369_B20220309 contains a post-authentication buffer overflow via parameter pppoeUser in the setOpModeCfg function.
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Analysis
by VulDB Data Team • 04/25/2025
The vulnerability identified as CVE-2022-44257 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 setOpModeCfg function of the device's web interface, specifically targeting the pppoeUser parameter which handles Point-to-Point Protocol over Ethernet user credentials. The flaw allows an authenticated attacker to manipulate input data in a way that exceeds the allocated buffer space, potentially leading to arbitrary code execution or system compromise. The issue demonstrates a classic buffer overflow vulnerability where insufficient input validation permits malicious data to overwrite adjacent memory regions, creating opportunities for privilege escalation and system instability.
The technical implementation of this vulnerability stems from inadequate bounds checking within the firmware's web application layer, where user-supplied data from the pppoeUser parameter is processed without proper sanitization or size validation. This weakness aligns with CWE-121, which categorizes stack-based buffer overflow conditions, and potentially CWE-787, which addresses out-of-bounds write vulnerabilities. The attack requires an authenticated session, meaning an adversary must first obtain valid credentials to the router's administrative interface, typically through credential guessing, password reuse, or other authentication bypass techniques. The exploitation process involves crafting a malicious payload that exceeds the buffer capacity allocated for the pppoeUser parameter, which can then cause the application to overwrite critical memory segments and potentially redirect execution flow.
From an operational perspective, this vulnerability presents significant risk to network infrastructure as it allows for remote code execution capabilities once an attacker gains access to the router's administrative interface. The impact extends beyond simple service disruption to include potential data breaches, network infiltration, and lateral movement within the compromised network. The vulnerability affects organizations that rely on TOTOLINK LR350 devices for their networking infrastructure, particularly those with limited security monitoring capabilities or outdated firmware management processes. The device's exposure to internet-facing networks increases the attack surface, making it a prime target for automated exploitation attempts. Organizations may experience unauthorized access to network configurations, potential data exfiltration, and the possibility of establishing persistent backdoors through the compromised device.
Mitigation strategies for CVE-2022-44257 should prioritize immediate firmware updates from TOTOLINK to address the buffer overflow vulnerability. Network administrators should implement strict access controls and authentication measures, including multi-factor authentication, to reduce the likelihood of unauthorized access. Regular security audits and network monitoring should be conducted to detect potential exploitation attempts or unauthorized configuration changes. The implementation of network segmentation and firewall rules can help limit the potential impact of a successful compromise. Additionally, organizations should establish robust patch management processes and consider network behavior monitoring to detect anomalous activities that may indicate exploitation attempts. Security teams should also review and test their incident response procedures to ensure readiness for potential exploitation of this vulnerability. The vulnerability's classification under ATT&CK technique T1059.007 for command and scripting interpreter suggests that exploitation may involve command injection attacks, requiring comprehensive network security controls to prevent unauthorized system access and maintain operational integrity.