CVE-2015-6255 in Unified Web
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Cisco Unified Web and E-Mail Interaction Manager 9.0(2) allows remote attackers to inject arbitrary web script or HTML via a crafted chat message, aka Bug ID CSCuo89051.
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Analysis
by VulDB Data Team • 06/12/2022
The vulnerability described in CVE-2015-6255 represents a critical cross-site scripting flaw within Cisco's Unified Web and E-Mail Interaction Manager version 9.0(2). This security weakness resides in the application's handling of chat messages, creating an avenue for remote attackers to execute malicious code within the context of a victim's browser session. The vulnerability specifically affects the web-based communication interface that facilitates chat interactions between users and the unified communication system, making it a significant concern for organizations relying on this platform for business communications.
The technical exploitation of this vulnerability occurs through the injection of malicious scripts or HTML content within chat messages that are processed and displayed by the web interface. When a victim views a crafted chat message containing malicious code, the script executes in their browser context, potentially leading to session hijacking, credential theft, or unauthorized actions within the application. This type of vulnerability falls under CWE-79 which specifically addresses Cross-Site Scripting flaws in software applications. The vulnerability's classification as a remote attack vector means that no authentication or local access is required for exploitation, making it particularly dangerous as attackers can target users from anywhere on the internet.
The operational impact of CVE-2015-6255 extends beyond simple script execution, as it can enable attackers to establish persistent access to user sessions within the Cisco Unified Web and E-Mail Interaction Manager environment. This capability allows threat actors to monitor communications, manipulate chat conversations, and potentially escalate privileges within the system. The vulnerability directly impacts the confidentiality, integrity, and availability of the communication platform, as attackers can intercept sensitive information exchanged through chat messages or disrupt normal operations. Organizations using this platform face risks of data breaches, unauthorized access to business communications, and potential compromise of their entire unified communication infrastructure.
Mitigation strategies for this vulnerability should include immediate application of Cisco's security patches and updates, which would address the input validation flaws in the chat message processing functionality. Network segmentation and web application firewalls can provide additional protection layers to detect and block malicious script injection attempts. Security monitoring should focus on unusual chat message patterns and unauthorized access attempts within the communication platform. The vulnerability's presence in the ATT&CK framework would be categorized under T1566 for credential harvesting and T1059 for command and scripting interpreter techniques, highlighting the multi-faceted attack surface this vulnerability creates for threat actors. Regular security assessments and input sanitization testing should be implemented to prevent similar vulnerabilities from emerging in the platform's codebase.