CVE-2014-6325 in Exchange Server
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Microsoft Exchange Server 2013 SP1 and Cumulative Update 6 allows remote attackers to inject arbitrary web script or HTML via a crafted URL, aka "OWA XSS Vulnerability," a different vulnerability than CVE-2014-6326.
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Analysis
by VulDB Data Team • 04/07/2022
The CVE-2014-6325 vulnerability represents a critical cross-site scripting flaw in Microsoft Exchange Server 2013 SP1 and Cumulative Update 6 environments. This vulnerability specifically affects the Outlook Web App (OWA) component of Exchange Server, which serves as the primary web-based interface for email access and management. The flaw enables remote attackers to execute malicious scripts within the context of authenticated user sessions, creating a significant security risk for enterprise email environments where users frequently interact with web-based email services.
The technical implementation of this XSS vulnerability occurs through improper input validation and output encoding within the OWA URL handling mechanisms. Attackers can craft malicious URLs that contain embedded script payloads which, when processed by the vulnerable Exchange Server, get executed in the browser context of unsuspecting users. This occurs because the server fails to properly sanitize user-supplied input parameters before incorporating them into dynamically generated web content. The vulnerability specifically affects the way the server processes and renders URLs, allowing attackers to inject malicious JavaScript code that executes when users navigate to the crafted malicious links.
The operational impact of CVE-2014-6325 extends beyond simple script injection, as it can lead to complete session hijacking and privilege escalation within the Exchange environment. An attacker who successfully exploits this vulnerability can potentially access sensitive email communications, impersonate users, and gain unauthorized access to corporate email accounts. The vulnerability is particularly dangerous because it requires no special privileges to exploit, making it accessible to any remote attacker who can convince a user to click on a malicious link. This creates a significant risk for enterprise environments where users may inadvertently click on phishing emails or malicious links in untrusted websites.
Organizations affected by this vulnerability should implement immediate mitigations including applying the relevant Microsoft security updates and patches released in response to this vulnerability. The fix involves proper input validation and output encoding mechanisms that prevent malicious scripts from being executed within the OWA interface. Additional defensive measures include implementing strict content security policies, enabling security headers such as X-Content-Type-Options and X-Frame-Options, and deploying web application firewalls to detect and block malicious URL patterns. From a compliance perspective, this vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws in web applications, and maps to ATT&CK technique T1566 related to phishing attacks that leverage web-based vulnerabilities.
The broader implications of this vulnerability highlight the critical importance of maintaining up-to-date security patches in enterprise email infrastructure. Exchange Server environments that remain unpatched after the release of Microsoft security updates create significant attack vectors for adversaries targeting corporate email systems. Organizations should establish robust patch management processes to ensure timely deployment of security updates, particularly for critical vulnerabilities affecting web-based applications that handle sensitive user data. The vulnerability also underscores the need for regular security assessments of web applications and the implementation of defense-in-depth strategies that include multiple layers of protection beyond simple patching.