CVE-2024-40764 in SonicOS
Summary
by MITRE • 07/18/2024
Heap-based buffer overflow vulnerability in the SonicOS IPSec VPN allows an unauthenticated remote attacker to cause Denial of Service (DoS).
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Analysis
by VulDB Data Team • 09/10/2024
This vulnerability exists within the SonicOS IPSec VPN implementation and represents a heap-based buffer overflow that can be exploited by unauthenticated remote attackers to trigger a denial of service condition. The flaw occurs when the system processes specific malformed IPSec packets that exceed the allocated buffer boundaries in the heap memory management structure. This type of vulnerability falls under the common weakness enumeration CWE-121 which describes heap-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The attack vector is particularly concerning as it requires no authentication credentials and can be executed from any remote location capable of sending crafted network traffic to the affected SonicOS device. The vulnerability impacts the core IPSec VPN functionality and can render the device completely unavailable to legitimate users while maintaining the system's operational state.
The technical exploitation of this vulnerability occurs through the manipulation of IPSec protocol message handling within the SonicOS firmware. When the system receives specially crafted IPSec packets that contain oversized or malformed payload data, the insufficient input validation causes the heap memory allocator to write data beyond the intended buffer boundaries. This memory corruption can result in application crashes, system instability, or complete service disruption. The heap overflow may overwrite critical function pointers, return addresses, or other control data structures that are essential for normal system operation. According to the ATT&CK framework, this represents a privilege escalation technique through remote code execution potential, though in this case it manifests as a denial of service rather than arbitrary code execution. The vulnerability demonstrates poor input sanitization practices that violate secure coding principles and can lead to cascading failures within the network infrastructure.
The operational impact of this vulnerability extends beyond simple service interruption to potentially compromise network availability and business continuity for organizations relying on SonicOS IPSec VPN services. When exploited successfully, the vulnerability can cause complete service degradation where legitimate users cannot establish secure VPN connections, leading to productivity losses and potential security gaps in remote access capabilities. Network administrators may experience difficulty in diagnosing the root cause of service outages since the symptoms manifest as general connectivity failures rather than specific error messages. The vulnerability affects organizations that depend on SonicWall's SonicOS platform for secure remote access solutions, potentially exposing critical business operations to extended downtime periods. The lack of authentication requirements means that attackers can exploit this vulnerability at scale without requiring access credentials or prior reconnaissance, making it particularly dangerous for widespread deployment scenarios.
Organizations should implement immediate mitigations including firmware updates from SonicWall that address the heap overflow condition through proper input validation and buffer boundary checks. Network segmentation strategies should be employed to limit exposure of vulnerable SonicOS devices to untrusted network segments, while monitoring systems should be enhanced to detect unusual traffic patterns that may indicate exploitation attempts. The implementation of IPSec traffic filtering rules that can identify and drop malformed packets may provide temporary protection while permanent patches are deployed. Security teams should also consider deploying intrusion detection systems that can recognize the specific packet patterns associated with this vulnerability. According to industry best practices for vulnerability management, organizations should conduct thorough risk assessments to determine the priority of patch deployment based on their exposure levels and criticality of affected systems. The vulnerability highlights the importance of maintaining up-to-date security patches and implementing robust network monitoring to detect and respond to exploitation attempts before they can cause significant operational impact.