CVE-2010-2734 in Forefront Unified Access Gateway
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the mobile portal 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 Issue on UAG Mobile Portal Website in Forefront Unified Access Gateway Vulnerability."
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Analysis
by VulDB Data Team • 09/28/2021
The vulnerability identified as CVE-2010-2734 represents a critical cross-site scripting flaw within the mobile portal component of Microsoft Forefront Unified Access Gateway 2010 across multiple update versions. This security weakness resides in the mobile portal website functionality of the UAG system, which serves as a unified access gateway for enterprise network security and remote access management. The vulnerability specifically affects organizations utilizing Microsoft's unified access gateway solution for securing remote user access to corporate resources through mobile devices and web interfaces.
The technical implementation of this XSS vulnerability stems from inadequate input validation and output encoding mechanisms within the mobile portal's web application layer. Attackers can exploit this weakness by crafting malicious payloads that are subsequently executed in the context of authenticated users' browsers when they access the vulnerable mobile portal interface. The unspecified vectors suggest that the vulnerability may manifest through multiple entry points including form inputs, URL parameters, or HTTP headers, making the attack surface broader and more difficult to fully mitigate through simple input sanitization measures. This type of vulnerability falls under CWE-79 which specifically addresses Cross-Site Scripting flaws in web applications where untrusted data is improperly handled during web page generation.
The operational impact of this vulnerability extends beyond simple script injection as it enables attackers to perform various malicious activities including session hijacking, credential theft, and data exfiltration from authenticated user sessions. An attacker who successfully exploits this vulnerability could gain access to sensitive corporate information, manipulate user sessions, or redirect users to malicious websites that appear legitimate. The mobile portal aspect of the vulnerability is particularly concerning as it targets mobile device users who may be accessing corporate resources from less secure networks or devices, potentially creating additional attack vectors for broader network compromise. This vulnerability aligns with ATT&CK technique T1531 which focuses on Establishing Persistence through Web Shell or Malicious Script Injection.
Organizations should implement comprehensive mitigations including input validation controls, output encoding of all dynamic content, and regular security assessments of the UAG mobile portal components. The recommended approach involves deploying web application firewalls to filter malicious payloads, implementing strict content security policies, and ensuring all users access the mobile portal through secure connections only. Microsoft released patches for this vulnerability as part of their regular security updates, and organizations should immediately apply the relevant security updates to prevent exploitation. Additionally, network segmentation and monitoring of mobile portal traffic can help detect anomalous behavior that may indicate exploitation attempts, while user education regarding suspicious website behavior remains an essential defensive measure against such client-side attacks.