CVE-2008-5121 in Deterministic Network Enhancer
Summary
by MITRE
dne2000.sys in Citrix Deterministic Network Enhancer (DNE) 2.21.7.233 through 3.21.7.17464, as used in (1) Cisco VPN Client, (2) Blue Coat WinProxy, and (3) SafeNet SoftRemote and HighAssurance Remote, allows local users to gain privileges via a crafted DNE_IOCTL DeviceIoControl request to the \\.\DNE device interface.
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Analysis
by VulDB Data Team • 12/12/2024
The vulnerability identified as CVE-2008-5121 represents a critical privilege escalation flaw within the Citrix Deterministic Network Enhancer (DNE) driver component. This vulnerability affects multiple commercial products including Cisco VPN Client, Blue Coat WinProxy, and SafeNet remote access solutions, making it a widespread concern across enterprise network security infrastructure. The issue stems from improper input validation within the dne2000.sys kernel driver, which handles device control requests through the DNE_IOCTL interface. The vulnerability specifically manifests when the driver processes DeviceIoControl requests sent to the \\.\DNE device interface, creating an exploitable condition that allows local attackers to elevate their privileges from standard user level to system level access.
The technical flaw resides in the kernel-mode driver's insufficient validation of IOCTL (Input/Output Control) parameters, which violates fundamental security principles outlined in CWE-129 and CWE-787. When a local user crafts a malicious DNE_IOCTL request, the driver fails to properly validate the input parameters, leading to potential memory corruption and arbitrary code execution within kernel space. This vulnerability directly maps to the ATT&CK technique T1068 which describes 'Local Privilege Escalation' through kernel exploits. The flaw enables attackers to bypass normal access controls and gain administrative privileges on the affected systems, potentially compromising the entire network infrastructure that relies on these security solutions.
The operational impact of this vulnerability extends beyond individual system compromise, as it affects critical network security components that many organizations depend upon for remote access and network protection. Attackers exploiting this vulnerability can establish persistent access to corporate networks, potentially leading to data breaches, lateral movement, and complete system compromise. The vulnerability affects a wide range of products from different vendors, including Cisco, Blue Coat, and SafeNet, indicating a systemic issue within the DNE implementation that requires immediate attention across multiple security domains. Organizations using these affected versions face significant risk, as the vulnerability can be exploited by any local user with access to the system, making it particularly dangerous in multi-user environments.
Mitigation strategies for CVE-2008-5121 should prioritize immediate patching of all affected Citrix DNE components, with particular attention to the specific version ranges mentioned in the vulnerability description. System administrators should implement the principle of least privilege by restricting local user access to systems running affected software and monitoring for suspicious DeviceIoControl activity. Network segmentation and endpoint protection measures can help limit the potential impact if exploitation occurs. The vulnerability highlights the importance of kernel-mode driver security and proper input validation, aligning with security best practices from NIST SP 800-144 and ISO/IEC 27001 standards. Organizations should also conduct thorough vulnerability assessments to identify any other instances of similar flaws in their network infrastructure components and ensure proper security testing of kernel-mode drivers before deployment.