CVE-2008-3814 in Unity
Summary
by MITRE
Unspecified vulnerability in Cisco Unity 4.x before 4.2(1)ES161, 5.x before 5.0(1)ES53, and 7.x before 7.0(2)ES8, when using anonymous authentication (aka native Unity authentication), allows remote attackers to bypass authentication and read or modify system configuration parameters by going to a specific link more than once.
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Analysis
by VulDB Data Team • 08/18/2019
The vulnerability identified as CVE-2008-3814 represents a critical authentication bypass flaw in Cisco Unity messaging systems that affects multiple version streams including 4.x, 5.x, and 7.x releases. This issue specifically manifests when the system operates with anonymous authentication enabled, which is also referred to as native Unity authentication mode. The vulnerability stems from improper handling of session management and authentication state validation within the web interface components of these messaging platforms. Attackers can exploit this weakness by repeatedly accessing a specific URI or link within the system's web interface, thereby circumventing the normal authentication mechanisms that should normally prevent unauthorized access to system configuration parameters.
The technical exploitation of this vulnerability occurs through a session manipulation attack vector that leverages the system's failure to properly validate authentication state during repeated access attempts. When anonymous authentication is enabled, the system should maintain strict access controls regardless of how many times a particular URI is accessed. However, the flaw allows attackers to manipulate the authentication flow by accessing the vulnerable link multiple times, effectively creating a condition where the system's internal authentication state becomes corrupted or bypassed entirely. This results in unauthorized remote access to system configuration parameters, which can include sensitive data such as user credentials, system settings, and network configuration information that could be used for further exploitation or system compromise.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass potential system compromise and data breaches. Organizations utilizing affected Cisco Unity versions with anonymous authentication enabled face significant risk of unauthorized modification of critical system parameters, which could lead to service disruption, data leakage, or the establishment of persistent access points within the network infrastructure. The vulnerability's remote nature means that attackers do not require physical access to the system or network, making it particularly dangerous for enterprise environments where such systems may be exposed to external networks. According to CWE classification, this vulnerability maps to CWE-287 - Improper Authentication, and aligns with ATT&CK technique T1078 - Valid Accounts, as it allows unauthorized access through legitimate authentication mechanisms that should have prevented such access. The vulnerability also relates to T1566 - Phishing with Social Engineering, as attackers may use this flaw to gain initial access and then escalate privileges through additional attacks.
Organizations should immediately implement mitigations including disabling anonymous authentication when it is not strictly required, applying the relevant security patches from Cisco that address this specific vulnerability, and implementing network segmentation to limit access to these systems. The recommended approach involves upgrading to Cisco Unity versions 4.2(1)ES161, 5.0(1)ES53, or 7.0(2)ES8 respectively, which contain fixes for this authentication bypass vulnerability. Additionally, network administrators should consider implementing access control lists that restrict access to the affected web interfaces, monitoring for suspicious access patterns, and conducting regular security assessments to identify potential exploitation attempts. The vulnerability demonstrates the critical importance of proper session management and authentication state validation in enterprise messaging systems, highlighting the need for comprehensive security testing and validation of authentication mechanisms before deployment in production environments.