CVE-2014-2884 in TrueCrypt
Summary
by MITRE
The ProcessVolumeDeviceControlIrp function in Ntdriver.c in TrueCrypt 7.1a allows local users to bypass access restrictions and obtain sensitive information about arbitrary files via a (1) TC_IOCTL_OPEN_TEST or (2) TC_IOCTL_GET_SYSTEM_DRIVE_CONFIG IOCTL call.
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Analysis
by VulDB Data Team • 01/14/2020
The vulnerability identified as CVE-2014-2884 resides within the TrueCrypt 7.1a disk encryption software and specifically targets the ProcessVolumeDeviceControlIrp function located in the Ntdriver.c file. This flaw represents a critical security weakness that undermines the core purpose of disk encryption by allowing unauthorized access to sensitive file information. The vulnerability operates at the kernel level within the Windows operating system, where TrueCrypt's driver component handles device control requests for encrypted volumes. The affected function processes IOCTL (Input/Output Control) commands that are typically used to communicate with device drivers, making it a prime target for privilege escalation attacks.
The technical exploitation of this vulnerability occurs through two specific IOCTL commands: TC_IOCTL_OPEN_TEST and TC_IOCTL_GET_SYSTEM_DRIVE_CONFIG. These commands, when improperly validated, enable local attackers to bypass the normal access control mechanisms that should protect encrypted volumes and their contents. The flaw stems from insufficient input validation and improper privilege checking within the driver code, allowing any local user to craft malicious IOCTL requests that can reveal information about arbitrary files on the system. This represents a classic case of inadequate access control implementation where the driver fails to properly verify the privileges of the calling process before executing sensitive operations. The vulnerability essentially creates a backdoor path that allows unauthorized information disclosure, effectively undermining the confidentiality guarantees that encryption software is designed to provide.
From an operational perspective, this vulnerability presents significant risks to system security and data protection. Local users who exploit this flaw can obtain sensitive information about files that should remain protected by encryption, potentially exposing file structures, metadata, or even partial content from encrypted volumes. The impact extends beyond simple information disclosure as it can enable further attacks such as privilege escalation, lateral movement, or targeted data exfiltration. Attackers could use this vulnerability to map out the filesystem structure, identify sensitive data locations, or gather intelligence for more sophisticated attacks. The local nature of the attack means that any user with access to the system can potentially exploit this vulnerability, making it particularly dangerous in multi-user environments or systems where user privileges are not strictly controlled. This aligns with ATT&CK technique T1068, which covers local privilege escalation through kernel vulnerabilities, and CWE-284, which addresses improper access control in software.
The mitigation strategies for this vulnerability primarily involve upgrading to a patched version of TrueCrypt or transitioning to alternative encryption solutions such as VeraCrypt, which addressed this specific flaw. System administrators should implement strict access controls and monitor for unusual IOCTL activity that might indicate exploitation attempts. The vulnerability also underscores the importance of proper privilege separation and input validation in kernel-mode drivers. Organizations should conduct regular security assessments of their encryption software and maintain up-to-date systems to prevent exploitation of known vulnerabilities. Additionally, the incident highlights the critical need for robust code review processes and security testing of kernel components, particularly those handling sensitive operations like encryption and decryption. The vulnerability demonstrates how even well-established encryption tools can contain critical flaws that expose systems to unauthorized access, emphasizing the importance of continuous security monitoring and timely patch management.