CVE-2022-0615 in Endpoint Antivirus
Summary
by MITRE • 02/25/2022
Use-after-free in eset_rtp kernel module used in ESET products for Linux allows potential attacker to trigger denial-of-service condition on the system.
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Analysis
by VulDB Data Team • 02/28/2022
The vulnerability identified as CVE-2022-0615 represents a critical use-after-free condition within the eset_rtp kernel module that forms part of ESET's Linux security suite. This flaw exists in the kernel-level component responsible for real-time protection functionality, creating a pathway for malicious actors to manipulate memory structures that have already been released. The vulnerability manifests when the kernel module fails to properly validate memory references during specific operational sequences, leading to a scenario where freed memory locations are accessed after they should no longer be valid. Such conditions typically arise from improper handling of reference counting mechanisms or inadequate synchronization primitives within kernel space code.
The technical exploitation of this use-after-free vulnerability enables attackers to manipulate the kernel's memory management subsystem through crafted inputs or specific operational conditions that trigger the vulnerable code path. When the eset_rtp module encounters certain processing scenarios, it may release memory resources while maintaining references to them, creating opportunities for subsequent memory access operations to corrupt data structures or execute arbitrary code within kernel context. This type of vulnerability falls under the common weakness enumeration CWE-416 which specifically addresses use-after-free conditions in software development. The attack vector typically involves triggering the vulnerable module through legitimate system operations that process user input or network traffic, allowing the attacker to cause the kernel to access freed memory locations and potentially escalate privileges or cause system instability.
The operational impact of CVE-2022-0615 extends beyond simple denial-of-service conditions to potentially enable privilege escalation and system compromise. While the immediate effect may appear as a denial-of-service scenario where the system becomes unresponsive or crashes, the underlying memory corruption can be leveraged to execute arbitrary code with kernel-level privileges. This represents a significant concern for enterprise environments where ESET products are deployed, as it could allow attackers to bypass security controls and gain elevated system access. The vulnerability affects multiple ESET products running on Linux platforms, making it a widespread concern across various security implementations. According to ATT&CK framework reference T1068, this vulnerability could be exploited to achieve privilege escalation through kernel exploits, while T1499 covers the potential denial-of-service impact that could disrupt system availability.
Mitigation strategies for CVE-2022-0615 primarily involve immediate patching of affected ESET products through official updates provided by the vendor, as the vulnerability requires kernel-level modifications that cannot be addressed through user-space workarounds. System administrators should prioritize updating all affected ESET products to versions containing the patched eset_rtp kernel module that properly implements memory management safeguards. Additionally, monitoring for unusual system behavior or kernel-level anomalies can help detect potential exploitation attempts, though this represents a reactive approach rather than a preventive measure. Network segmentation and access controls should be implemented to limit potential attack surface, while regular security assessments can help identify systems running vulnerable versions of ESET software. The vulnerability highlights the importance of kernel module security testing and proper memory management practices, particularly in security products that operate with elevated privileges. Organizations should also consider implementing kernel hardening measures such as stack canaries, address space layout randomization, and kernel module signing requirements to reduce the impact of similar vulnerabilities in the future.