CVE-2014-3304 in WebEx Meetings Server
Summary
by MITRE
The OutlookAction Class in Cisco WebEx Meetings Server allows remote attackers to enumerate user accounts by entering crafted URLs and examining the returned messages, aka Bug ID CSCuj81722.
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Analysis
by VulDB Data Team • 02/10/2022
The vulnerability described in CVE-2014-3304 represents a critical information disclosure flaw within Cisco WebEx Meetings Server's OutlookAction Class implementation. This vulnerability enables remote attackers to perform user account enumeration through carefully crafted URLs that trigger specific responses from the server. The flaw exists in the server's handling of certain HTTP requests and demonstrates a classic example of insufficient input validation and error message handling that can reveal sensitive system information to unauthorized parties. The vulnerability specifically affects the WebEx Meetings Server component that manages Outlook integration functionality, making it particularly dangerous as it could be exploited by attackers seeking to map valid user accounts within an organization's communication infrastructure.
The technical implementation of this vulnerability stems from the OutlookAction Class's inadequate processing of malformed or specially crafted URLs that are designed to trigger specific error conditions or response patterns. When an attacker submits these crafted requests, the server responds with information that reveals whether specific user accounts exist within the system, effectively enabling account enumeration attacks. This type of vulnerability falls under the CWE-200 category of "Information Exposure" and represents a form of passive reconnaissance that can be used to build comprehensive user account profiles for subsequent attack phases. The vulnerability is particularly concerning because it operates at the application layer and requires no authentication to exploit, making it accessible to any remote attacker with network connectivity to the affected server.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with crucial reconnaissance data that can be leveraged for more sophisticated attacks. Once an attacker has successfully enumerated valid user accounts, they can use this information to conduct targeted password spraying, credential stuffing, or brute force attacks against the identified accounts. The vulnerability also potentially enables social engineering attacks where attackers can use the discovered user information to craft more convincing phishing campaigns. From an attacker's perspective, this represents a low-effort, high-reward vulnerability that can significantly reduce the time and complexity required to compromise the target environment. The vulnerability aligns with ATT&CK technique T1087.001 "Account Discovery: Local Account" and T1590.001 "Reconnaissance: Network Reconnaissance" as it enables systematic enumeration of user accounts within the system.
Organizations affected by this vulnerability should implement immediate mitigations including network segmentation to restrict access to the WebEx Meetings Server, implementing proper access controls and authentication mechanisms, and deploying intrusion detection systems to monitor for suspicious URL patterns. Cisco released patches and updates to address this vulnerability, and administrators should ensure their systems are updated to the latest security releases. Additional defensive measures include implementing web application firewalls to filter malicious requests, monitoring server logs for unusual access patterns, and conducting regular security assessments to identify similar vulnerabilities in other components of the WebEx ecosystem. The vulnerability also highlights the importance of proper error handling in web applications and demonstrates how seemingly benign functionality can become a security risk when not properly secured against malicious input manipulation.