CVE-2022-3703 in Remote Access Server
Summary
by MITRE • 11/11/2022
All versions of ETIC Telecom Remote Access Server (RAS) 4.5.0 and prior’s web portal is vulnerable to accepting malicious firmware packages that could provide a backdoor to an attacker and provide privilege escalation to the device.
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Analysis
by VulDB Data Team • 09/17/2024
The ETIC Telecom Remote Access Server RAS 4.5.0 and earlier versions contain a critical vulnerability in their web portal that allows for unauthorized firmware package acceptance, creating a significant security risk for network infrastructure. This vulnerability stems from inadequate validation mechanisms within the firmware update process, enabling malicious actors to upload and install unauthorized firmware images that can establish persistent backdoor access to the device. The flaw represents a serious compromise of the device's integrity and security posture, as it allows attackers to gain unauthorized control over the remote access server and potentially escalate privileges to gain administrative access to the underlying system.
The technical implementation of this vulnerability involves the web portal's failure to properly authenticate and validate firmware packages before installation. Attackers can exploit this weakness by crafting malicious firmware images that bypass the normal verification processes, potentially including pre-configured backdoors or modified binaries that provide persistent access. This flaw operates at the firmware level, meaning that successful exploitation can result in complete compromise of the device and its network functions. The vulnerability's impact is amplified by the fact that it affects all versions up to and including 4.5.0, indicating a long-standing issue that has not been adequately addressed in the product lifecycle. The weakness can be categorized under CWE-494 as the reception of untrusted data that is not properly validated, and it aligns with ATT&CK technique T1547.001 for registry run keys and startup folder persistence, as the malicious firmware can establish persistent access mechanisms.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it enables attackers to gain elevated privileges and potentially use the compromised device as a pivot point for further network infiltration. The remote access server serves as a critical network gateway, and its compromise can lead to widespread network disruption, data exfiltration, and lateral movement within the affected network infrastructure. Organizations relying on ETIC Telecom RAS devices for remote access management face significant risk of unauthorized network access, service disruption, and potential data breaches. The vulnerability also creates opportunities for attackers to establish persistent access points within the network, making detection and remediation more challenging.
Mitigation strategies for this vulnerability require immediate action including applying the latest firmware updates from ETIC Telecom that address the firmware validation issues. Organizations should implement network segmentation and access controls to limit exposure of RAS devices to untrusted networks, while also conducting thorough security assessments of affected systems. The implementation of network monitoring solutions to detect unusual firmware update activities and unauthorized access attempts provides additional layers of defense. Security teams should also consider disabling unnecessary web portal access where possible and implementing strict access controls for firmware update operations. Regular vulnerability assessments and penetration testing should be conducted to identify similar issues in other network infrastructure components, ensuring comprehensive protection against similar attack vectors. The vulnerability highlights the critical importance of secure firmware update mechanisms and proper input validation in network infrastructure devices, particularly those handling remote access functions.