CVE-2014-8000 in Unified Communications Manager IM
Summary
by MITRE
Cisco Unified Communications Manager IM and Presence Service 9.1(1) produces different returned messages for URL requests depending on whether a username exists, which allows remote attackers to enumerate user accounts via a series of requests, aka Bug ID CSCur63497.
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Analysis
by VulDB Data Team • 04/04/2022
Cisco Unified Communications Manager IM and Presence Service version 9.1(1) contains a vulnerability that enables remote attackers to perform user account enumeration through crafted URL requests. This flaw stems from the service's inconsistent response behavior when processing authentication requests for non-existent versus existing usernames. The vulnerability manifests when the system returns different error messages or response codes based on the existence of a user account, creating a side-channel information disclosure that can be exploited for account enumeration purposes.
The technical implementation of this vulnerability involves the service's handling of authentication requests through the IM and Presence Service component. When a request is made with a username that does not exist in the system, the service responds with a different message or status code compared to when a legitimate user account is queried. This differential response behavior creates a predictable pattern that attackers can exploit to determine which usernames are valid within the system. The vulnerability operates at the application layer and specifically affects the authentication and authorization mechanisms of the unified communications platform.
The operational impact of this vulnerability extends beyond simple account enumeration, as it provides attackers with a foundation for more sophisticated attacks. Once valid usernames are discovered through this method, attackers can proceed with password spraying, brute force attacks, or social engineering campaigns targeting specific users. The vulnerability affects the confidentiality aspect of the CIA triad by leaking user account information that should remain private. This disclosure can lead to further compromise of the unified communications infrastructure and potentially expose sensitive communication data. The attack vector requires no authentication initially, making it particularly dangerous as it allows for reconnaissance without prior access to the system.
Security professionals should implement multiple mitigations to address this vulnerability. The primary solution involves applying the relevant Cisco security advisory and patching the affected system to version 9.1(2) or later. Network segmentation and access controls should be enforced to limit exposure of the IM and Presence Service to untrusted networks. Implementing rate limiting and account lockout mechanisms can help prevent automated enumeration attempts. Additionally, monitoring for unusual patterns in authentication request responses can serve as an early detection mechanism. This vulnerability aligns with CWE-200, Information Exposure, and maps to ATT&CK technique T1087.001 for Account Discovery, making it a significant concern for organizations relying on Cisco unified communications platforms. Organizations should also consider implementing intrusion detection systems that can identify and alert on patterns consistent with account enumeration attempts.