CVE-2010-3936 in Forefront Unified Access Gateway
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Signurl.asp in Microsoft Forefront Unified Access Gateway (UAG) 2010 Gold, 2010 Update 1, and 2010 Update 2 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors, aka "XSS in Signurl.asp Vulnerability."
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Analysis
by VulDB Data Team • 09/29/2021
The CVE-2010-3936 vulnerability represents a critical cross-site scripting flaw discovered in Microsoft Forefront Unified Access Gateway 2010 versions, specifically affecting the Signurl.asp component. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is a pervasive web application security weakness that enables attackers to inject malicious scripts into web pages viewed by other users. The UAG 2010 product suite serves as a unified access gateway solution that provides secure remote access to enterprise resources, making this vulnerability particularly concerning for organizations relying on its services. The vulnerability exists within the Signurl.asp file, which is responsible for handling URL signing operations, a core function that authenticates and authorizes access to protected resources through signed URLs.
The technical exploitation of this XSS vulnerability occurs through unspecified vectors within the Signurl.asp component, allowing remote attackers to inject arbitrary web scripts or HTML content. This injection capability enables attackers to execute malicious code within the context of a victim's browser session, potentially leading to session hijacking, credential theft, or unauthorized access to protected resources. The vulnerability's impact extends beyond simple script injection as it can be leveraged to bypass security controls that depend on the integrity of URL parameters and authentication tokens. Attackers can craft malicious URLs that, when accessed by authenticated users, would execute their payloads and potentially escalate privileges or gain access to sensitive corporate data. The unspecified nature of the attack vectors suggests that multiple input points within the Signurl.asp component may be susceptible to manipulation, increasing the attack surface and making the vulnerability particularly challenging to defend against.
The operational impact of CVE-2010-3936 is significant for organizations utilizing Microsoft Forefront UAG 2010, as it undermines the security assurances provided by the unified access gateway. When exploited, this vulnerability can compromise the integrity of the authentication process and potentially lead to unauthorized access to corporate networks and resources. The attack scenario typically involves an attacker crafting malicious URLs that contain script payloads, which are then executed when legitimate users access these URLs through the UAG portal. This can result in session fixation, cookie theft, and privilege escalation attacks that leverage the trust relationship between the UAG and authenticated users. The vulnerability also aligns with ATT&CK technique T1566 for Phishing and T1071 for Application Layer Protocol, as it enables attackers to deliver malicious payloads through web-based attack vectors that exploit the trust users place in legitimate corporate portals.
Organizations affected by this vulnerability should implement immediate mitigations including input validation and output encoding for all parameters processed by the Signurl.asp component. The recommended approach involves implementing strict validation of all URL parameters and ensuring proper HTML encoding of dynamic content before rendering it in web responses. Security patches and updates from Microsoft should be deployed immediately to address the vulnerability, as the company released specific fixes for this issue in their security bulletins. Network segmentation and monitoring should be enhanced to detect suspicious URL patterns that may indicate exploitation attempts. Additionally, user education regarding the dangers of clicking suspicious links and the importance of verifying URL authenticity becomes crucial in mitigating the risk. Organizations should also consider implementing web application firewalls that can detect and block XSS attack patterns targeting the vulnerable Signurl.asp component. The vulnerability demonstrates the importance of secure coding practices and input sanitization in web applications, particularly those handling authentication and authorization functions, as it represents a classic example of how insufficient validation can lead to complete compromise of web application security.