CVE-2012-6325 in vCenter
Summary
by MITRE
VMware vCenter Server Appliance (vCSA) 5.0 before Update 2 does not properly parse XML documents, which allows remote authenticated users to read arbitrary files via unspecified vectors.
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Analysis
by VulDB Data Team • 04/20/2021
The vulnerability identified as CVE-2012-6325 affects VMware vCenter Server Appliance version 5.0 prior to Update 2, representing a critical security flaw in the XML parsing mechanism of the virtualization management platform. This issue stems from insufficient input validation during XML document processing, creating a pathway for malicious actors to exploit the system's file reading capabilities. The vulnerability specifically targets the vCSA's handling of XML data structures, which are commonly used for configuration management and communication protocols within the VMware ecosystem. Security researchers have classified this as an XML external entity processing vulnerability that allows for arbitrary file access through crafted XML input. The flaw exists in the server-side processing logic where XML documents are parsed without adequate sanitization of external entity references, potentially enabling attackers to access sensitive system files through the vulnerable interface.
The technical exploitation of this vulnerability requires an authenticated user account within the vCenter environment, which significantly reduces the attack surface compared to unauthenticated exploits. However, the impact remains severe as the authenticated attacker can leverage the XML parsing flaw to read arbitrary files from the system filesystem. This capability can be used to extract configuration files, credential stores, or other sensitive data that may be stored in accessible locations within the vCSA. The vulnerability operates through unspecified vectors that typically involve crafting specially formatted XML requests that trigger the insecure parsing behavior, allowing the attacker to manipulate the XML processor into reading files from unintended locations. The attack chain demonstrates characteristics consistent with CWE-611, which describes improper restriction of XML external entity reference, a classification that encompasses XML injection vulnerabilities. The exploitation process may involve leveraging XML parsers that support external entity resolution, enabling the attacker to access local files through entity references that are not properly validated or restricted.
The operational impact of CVE-2012-6325 extends beyond simple information disclosure, as the ability to read arbitrary files can lead to complete system compromise when combined with other vulnerabilities or attack vectors. Organizations using affected vCSA versions face potential exposure of sensitive configuration data, including database credentials, SSL certificates, and system configuration files that could be used for further attacks. The vulnerability's presence in the vCenter Server Appliance makes it particularly concerning for enterprise environments that rely on VMware's virtualization management platform for critical infrastructure operations. Attackers could potentially access system logs, user credentials, or other sensitive information that could facilitate lateral movement within the network or enable more sophisticated attacks. The vulnerability's impact is amplified in environments where vCenter serves as a central management point for multiple virtual machines and data centers, as a successful exploitation could provide attackers with access to comprehensive virtual infrastructure information. This type of vulnerability aligns with ATT&CK technique T1566, which covers the exploitation of vulnerabilities in remote services, and T1078, which covers valid accounts for persistence and access. Organizations may need to implement additional monitoring and access controls around vCenter management interfaces to detect potential exploitation attempts.
The remediation for CVE-2012-6325 requires immediate application of VMware's security update for vCenter Server Appliance 5.0 Update 2, which addresses the XML parsing vulnerability through proper input validation and sanitization of external entity references. Organizations should also implement network segmentation and access controls to limit the exposure of vCenter management interfaces to trusted networks only. Security monitoring should be enhanced to detect unusual file access patterns or XML processing activities that may indicate exploitation attempts. System administrators should review and tighten access controls for vCenter environments, ensuring that only necessary personnel have authentication credentials. The vulnerability highlights the importance of maintaining current security patches and implementing robust configuration management practices for virtualization platforms. Additional mitigations may include disabling unnecessary XML processing capabilities where possible and implementing network-based intrusion detection systems to monitor for potential exploitation attempts. Organizations should also conduct regular vulnerability assessments of their virtualization infrastructure to identify similar issues that may exist in other components of their VMware environment. The fix addresses the core parsing issue through proper XML validation and ensures that external entity references are properly restricted, preventing the arbitrary file reading behavior that was previously possible. This vulnerability serves as a reminder of the critical importance of timely patch management and the potential impact of XML processing flaws in enterprise management systems.