CVE-2012-4068 in Provisioning Services
Summary
by MITRE
Heap-based buffer overflow in the SoapServer service in Citrix Provisioning Services 5.0, 5.1, 5.6, 5.6 SP1, 6.0, and 6.1 allows remote attackers to execute arbitrary code via a crafted string associated with date and time data.
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Analysis
by VulDB Data Team • 12/07/2021
The vulnerability identified as CVE-2012-4068 represents a critical heap-based buffer overflow in Citrix Provisioning Services SoapServer component affecting multiple versions from 5.0 through 6.1. This flaw exists within the handling of date and time data within the SOAP service interface, creating a pathway for remote code execution attacks. The vulnerability stems from insufficient input validation and memory management practices when processing crafted date and time strings that exceed allocated buffer boundaries. The affected Citrix Provisioning Services environment operates as a centralized delivery system for Windows operating system images, making it a critical component in enterprise virtual desktop infrastructure deployments where security controls are paramount.
The technical implementation of this vulnerability involves the SoapServer service's failure to properly validate string length parameters when processing date and time data elements within SOAP requests. When a remote attacker submits a specially crafted string containing excessive data in date/time fields, the service allocates insufficient heap memory to accommodate the input, resulting in buffer overflow conditions. This overflow corrupts adjacent memory locations and can be manipulated to overwrite critical program execution pointers or return addresses, enabling attackers to inject and execute arbitrary code with the privileges of the affected service process. The vulnerability aligns with CWE-121 heap-based buffer overflow classification and represents a classic example of improper input validation leading to memory corruption.
Operationally, this vulnerability presents severe risks to organizations utilizing Citrix Provisioning Services in their virtual desktop environments, as it allows remote attackers to gain unauthorized code execution capabilities without requiring authentication. Attackers can leverage this vulnerability to establish persistent access, escalate privileges, or deploy additional malicious payloads within the targeted infrastructure. The impact extends beyond individual system compromise to potentially affect entire virtual desktop fleets managed by the affected provisioning service, making it particularly dangerous in enterprise environments where centralized image management is critical. Security analysts should note that this vulnerability was particularly concerning given Citrix Provisioning Services' role in delivering operating system images to virtual desktops, potentially enabling attackers to compromise the entire virtualization infrastructure.
Mitigation strategies for CVE-2012-4068 should prioritize immediate application of vendor security patches and updates, as Citrix released specific fixes addressing this buffer overflow vulnerability. Organizations should implement network segmentation and access controls to limit exposure of the affected SoapServer service to trusted networks only, reducing the attack surface available to potential remote attackers. Network monitoring solutions should be configured to detect anomalous SOAP requests containing unusually long date/time data strings that might indicate exploitation attempts. Additionally, implementing application whitelisting policies and regular security assessments of Citrix environments can help identify and remediate similar vulnerabilities before they can be exploited. The remediation approach should align with industry best practices for memory safety and input validation, following ATT&CK technique T1059 for remote code execution and T1210 for exploitation of remote services. Regular vulnerability assessments and security updates remain critical for maintaining protection against similar heap-based buffer overflow vulnerabilities in enterprise infrastructure components.