CVE-2022-2402 in Endpoint Encryption
Summary
by MITRE • 09/06/2022
The vulnerability in the driver dlpfde.sys enables a user logged into the system to perform system calls leading to kernel stack overflow, resulting in a system crash, for instance, a BSOD.
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Analysis
by VulDB Data Team • 09/07/2022
The vulnerability identified as CVE-2022-2402 resides within the dlpfde.sys driver component, representing a critical kernel-mode security flaw that undermines system stability and integrity. This driver serves as a foundational element in certain enterprise security solutions, particularly those involving data loss prevention and file encryption mechanisms. The vulnerability manifests through improper input validation and memory management practices within the kernel-level driver, creating an exploitable condition that allows authenticated users to manipulate system calls in ways that directly impact kernel execution. The flaw specifically affects the handling of kernel stack operations during driver execution, where insufficient bounds checking permits malicious input to overflow the allocated kernel stack space.
The technical exploitation of this vulnerability occurs through crafted system calls that deliberately exceed the allocated kernel stack buffer limits, causing a stack overflow condition that results in immediate system termination. This mechanism operates at the kernel level, bypassing standard user-mode protections and security boundaries that typically isolate malicious code from critical system resources. When the overflow occurs, it corrupts kernel stack memory structures, leading to unpredictable behavior and ultimately system crashes that manifest as blue screen of death (BSOD) conditions. The vulnerability's impact is amplified by the fact that it requires only local user authentication, making it accessible to any individual with legitimate system access, whether through legitimate administrative privileges or compromised accounts.
From an operational standpoint, this vulnerability presents significant risks to enterprise environments where system stability and uptime are paramount. The ability to trigger kernel-level crashes through legitimate user accounts creates both intentional and unintentional denial-of-service scenarios that can disrupt critical business operations. The vulnerability's exploitation can occur without requiring elevated privileges beyond standard user access, making it particularly dangerous in multi-user environments where privilege separation may be insufficient. Security teams face challenges in detecting this vulnerability since it operates within legitimate system processes and may not generate obvious alert conditions that would trigger traditional intrusion detection systems.
The exploitation of CVE-2022-2402 aligns with ATT&CK technique T1068, which describes the use of local privilege escalation techniques to gain kernel-level access. This vulnerability represents a classic example of a kernel exploit that can be leveraged to bypass security controls that operate at user mode levels. The flaw demonstrates characteristics consistent with CWE-121, which describes stack-based buffer overflow conditions, and CWE-125, which addresses out-of-bounds read conditions that can occur when kernel memory management fails to properly validate input parameters. Organizations utilizing affected driver versions face potential risks including system instability, data loss from unexpected shutdowns, and the possibility of exploitation leading to broader system compromise. The vulnerability's presence in enterprise security solutions creates a particularly concerning scenario where the very tools designed to protect systems become potential attack vectors.
Mitigation strategies for CVE-2022-2402 should prioritize immediate driver updates from vendors, as these patches typically address the underlying memory management flaws that enable the stack overflow conditions. Organizations must implement comprehensive patch management protocols to ensure timely deployment of vendor-supplied fixes, particularly in environments where the affected driver is actively deployed. Additional protective measures include implementing kernel-mode exploit prevention technologies, enhancing system monitoring for abnormal kernel-level activity, and conducting regular security assessments to identify potentially vulnerable driver installations. Network segmentation and privilege minimization practices can reduce the attack surface by limiting user access to systems running affected drivers, while behavioral monitoring systems can help detect anomalous kernel call patterns that may indicate exploitation attempts. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date kernel components and the potential for legitimate system drivers to contain exploitable conditions that require continuous security assessment and monitoring.