CVE-2022-33202 in L2Blocker
Summary
by MITRE • 06/27/2022
Authentication bypass vulnerability in the setup screen of L2Blocker(on-premise) Ver4.8.5 and earlier and L2Blocker(Cloud) Ver4.8.5 and earlier allows an adjacent attacker to perform an unauthorized login and obtain the stored information or cause a malfunction of the device by using alternative paths or channels for Sensor.
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Analysis
by VulDB Data Team • 07/15/2022
The CVE-2022-33202 vulnerability represents a critical authentication bypass flaw affecting L2Blocker network security appliances in both on-premise and cloud deployments. This vulnerability specifically targets the setup screen authentication mechanism, creating a pathway for adjacent attackers to circumvent the standard login process. The flaw exists in versions 4.8.5 and earlier of both L2Blocker on-premise and cloud solutions, making a significant portion of deployed security infrastructure susceptible to exploitation. The vulnerability's impact extends beyond simple unauthorized access, as it enables attackers to obtain stored sensitive information and potentially cause device malfunctions through alternative sensor paths or channels.
The technical implementation of this authentication bypass stems from inadequate validation mechanisms within the setup screen component of the L2Blocker appliances. Attackers leveraging adjacent network access can exploit this weakness to perform unauthorized logins without proper credentials, effectively bypassing the authentication layer that should protect administrative functions. The vulnerability's design allows for alternative access paths through sensor interfaces, which creates multiple vectors for exploitation. This architectural flaw represents a failure in the principle of least privilege and proper access control enforcement, as the system fails to adequately verify user identity before granting administrative privileges.
From an operational perspective, this vulnerability creates severe security implications for organizations relying on L2Blocker appliances for network protection. Adjacent attackers who gain physical or network proximity to the devices can exploit this flaw to establish unauthorized administrative control, potentially leading to complete network compromise. The ability to access stored information means that sensitive configuration data, network mappings, and security policies could be exposed to unauthorized parties. Additionally, the potential to cause device malfunction introduces operational risks including denial of service conditions that could impact network security operations. This vulnerability directly violates security standards such as those outlined in CWE-287, which addresses improper authentication issues, and aligns with ATT&CK techniques related to privilege escalation and initial access through network service vulnerabilities.
Organizations should immediately implement mitigations including upgrading to versions beyond 4.8.5 where the vulnerability has been addressed, implementing network segmentation to limit adjacent access, and monitoring for suspicious authentication attempts. Network administrators should also consider disabling unnecessary setup screen access and implementing additional authentication layers. The vulnerability demonstrates the importance of thorough security testing during development phases and the necessity of maintaining up-to-date security patches. Organizations using L2Blocker appliances should conduct comprehensive security assessments to identify all instances of affected versions and ensure proper access controls are enforced across all administrative interfaces.