CVE-2016-10316 in Air:Link 3G
Summary
by MITRE
Jensen of Scandinavia AS Air:Link 3G (AL3G) version 2.23m (Rev. 3), Air:Link 5000AC (AL5000AC) version 1.13, and Air:Link 59300 (AL59300) version 1.04 (Rev. 4) devices allow remote attackers to conduct Open Redirect attacks via the return-url parameter to /goform/formLogout.
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Analysis
by VulDB Data Team • 08/25/2020
This vulnerability affects several Air:Link 3G and Air:Link 5000 series devices manufactured by Jensen of Scandinavia AS, specifically versions 2.23m (Rev. 3), 1.13, and 1.04 (Rev. 4) respectively. The flaw exists in the web interface authentication handling mechanism where the return-url parameter in the /goform/formLogout endpoint fails to properly validate or sanitize user input. This creates an open redirect vulnerability that allows remote attackers to manipulate the redirect behavior during logout operations.
The technical implementation of this vulnerability stems from improper input validation within the web application framework of these networking devices. When a user attempts to log out from the device's web interface, the system accepts a return-url parameter that specifies where the user should be redirected after logout. However, the application does not validate whether this URL parameter points to a legitimate internal resource or allows arbitrary external URLs. This validation failure creates a pathway for attackers to craft malicious URLs that redirect users to phishing sites or other malicious destinations.
From an operational security perspective, this vulnerability presents significant risks to organizations using these devices in their network infrastructure. Attackers can exploit this weakness to perform phishing attacks against legitimate users who are logged into the device management interface. When users click on malicious links that leverage this vulnerability, they may be redirected to attacker-controlled domains where credentials or sensitive information could be harvested. The impact extends beyond simple credential theft as it can enable further exploitation within the network perimeter.
The vulnerability aligns with CWE-601 Open Redirect vulnerability classification which specifically addresses situations where applications redirect users to unvalidated external URLs. This weakness falls under the broader category of web application security flaws that can be exploited to bypass security controls and deceive users. According to ATT&CK framework, this vulnerability maps to T1566.001 Initial Access: Phishing, as it enables attackers to create convincing phishing scenarios that leverage legitimate device interfaces. The attack chain typically involves crafting malicious URLs that redirect users to attacker-controlled sites during logout operations, potentially leading to credential compromise and further network infiltration.
Organizations should immediately implement mitigations including firmware updates from the vendor to address the validation flaw, network segmentation to limit access to these management interfaces, and mandatory access controls that restrict who can access device configuration portals. Additionally, network monitoring should be enhanced to detect suspicious redirect patterns and user behavior anomalies during logout operations. Security awareness training for administrators should emphasize the risks of clicking unknown links, particularly those that might appear to originate from legitimate device management interfaces. The most effective long-term solution involves updating to firmware versions that properly validate all redirect URLs against a whitelist of approved internal destinations.