CVE-2022-34767 in WR0500AC
Summary
by MITRE • 07/21/2022
Web page which "wizardpwd.asp" ALLNET Router model WR0500AC is prone to Authorization bypass vulnerability – the password, located at "admin" allows changing the http[s]://wizardpwd.asp/cgi-bin. Does not validate the user's identity and can be accessed publicly.
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Analysis
by VulDB Data Team • 07/22/2022
The CVE-2022-34767 vulnerability represents a critical authorization bypass flaw in ALLNET Router model WR0500AC devices that exposes administrative functions to unauthorized users. This vulnerability exists within the web interface component known as "wizardpwd.asp" which serves as a configuration wizard for the router's administrative password settings. The flaw allows any remote attacker to access the administrative password change functionality without proper authentication, effectively undermining the device's security architecture. The vulnerability specifically affects the URL path http://wizardpwd.asp/cgi-bin which should require valid administrative credentials to access but instead permits unrestricted access to the password modification interface.
This authorization bypass vulnerability stems from inadequate input validation and authentication mechanisms within the router's web server implementation. The device fails to properly verify user identities before granting access to administrative functions, creating a direct pathway for unauthorized modification of critical system parameters. The vulnerability is particularly concerning because it allows attackers to change the administrative password through the wizard interface, potentially providing persistent access to the device. The flaw demonstrates a classic security misconfiguration where administrative interfaces are exposed without proper access controls, violating fundamental security principles of least privilege and proper authentication.
The operational impact of this vulnerability is severe as it enables attackers to completely compromise router administrative access. Once exploited, an attacker can modify the administrative password, potentially locking out legitimate users while maintaining control over the device. This provides attackers with a persistent backdoor into the network, allowing them to modify router configurations, redirect traffic, or establish further attack vectors. The vulnerability affects the entire network infrastructure managed by the compromised router, as administrative access typically grants control over routing decisions, firewall rules, and network policies. The exposure of the wizardpwd.asp interface to public access means that any internet-connected device can potentially exploit this vulnerability without requiring additional reconnaissance or privilege escalation.
Security standards such as CWE-285 (Improper Authorization) and CWE-306 (Missing Authentication for Critical Function) directly apply to this vulnerability, as the router fails to properly authenticate users before granting access to critical administrative functions. From an ATT&CK framework perspective, this vulnerability maps to T1078 (Valid Accounts) and T1566 (Phishing) as attackers can leverage the compromised administrative access to maintain persistence and potentially establish further network infiltration. The vulnerability also aligns with T1021.001 (Remote Services: Remote Desktop Protocol) and T1046 (Network Service Scanning) as attackers may use the compromised device as a pivot point for further network exploration.
Mitigation strategies should include immediate firmware updates from ALLNET to address the authentication bypass vulnerability, network segmentation to isolate critical devices, and implementation of network access controls to restrict access to administrative interfaces. Administrators should disable unnecessary web interfaces, change default administrative credentials, and implement strong access controls using firewalls to restrict access to the wizardpwd.asp endpoint. Regular security assessments and network monitoring should be conducted to detect potential exploitation attempts, while network administrators should consider implementing intrusion detection systems to monitor for suspicious access patterns to administrative interfaces. The vulnerability underscores the importance of proper authentication mechanisms and access control implementation in network infrastructure devices, particularly those with web-based management interfaces that are exposed to potentially untrusted network environments.