CVE-2008-6896 in Phone System
Summary
by MITRE
login.php in 3CX Phone System 6.0.806.0, when 100% disk capacity is reached, allows remote attackers to gain sensitive information via unspecified vectors that reveal the installation path.
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Analysis
by VulDB Data Team • 12/22/2017
The vulnerability identified as CVE-2008-6896 affects the 3CX Phone System version 6.0.806.0 and represents a sensitive information disclosure flaw that occurs under specific operational conditions. This vulnerability manifests when the system reaches 100% disk capacity, creating a scenario where remote attackers can exploit unspecified vectors to obtain sensitive installation path information. The 3CX Phone System is a unified communications platform that provides voice, video, and messaging capabilities for enterprise environments, making it a critical component in organizational communication infrastructure.
The technical flaw in this vulnerability stems from the system's inadequate error handling mechanism when disk space reaches critical levels. When storage capacity hits 100%, the login.php script fails to properly sanitize or control error messages that are generated during the authentication process. This failure creates an information disclosure condition where the installation path of the 3CX system becomes visible to remote attackers who can access the login interface. The vulnerability operates through unspecified vectors that likely involve manipulation of system resources or error states during authentication attempts, allowing attackers to extract path information that should remain confidential.
The operational impact of this vulnerability extends beyond simple information disclosure, as the revelation of installation paths can significantly aid attackers in planning more sophisticated attacks against the 3CX Phone System. An attacker who obtains the installation path gains valuable reconnaissance information that can be used to identify system configuration details, potential file locations, and directory structures. This information can facilitate subsequent exploitation attempts, including path traversal attacks, privilege escalation, or targeted attacks against specific system components. The vulnerability particularly affects enterprise environments where 3CX systems are deployed, as the installation path disclosure can expose organizational infrastructure details that attackers can leverage for network reconnaissance and lateral movement.
Security professionals should note that this vulnerability aligns with CWE-200, which addresses information exposure, and represents a classic example of improper error handling that reveals system information to unauthorized users. The attack pattern associated with this vulnerability would fall under the ATT&CK technique T1083, Information Discovery, where adversaries gather information about the system environment to inform their next steps. Organizations should implement immediate mitigations including proper error handling configuration, disk space monitoring systems, and regular capacity management to prevent the conditions that trigger this vulnerability. Additionally, access controls and network segmentation should be enforced to limit exposure of the login interface to unauthorized parties, while regular security assessments should be conducted to identify similar information disclosure vulnerabilities in other system components.