CVE-2023-44217 in SonicWALL NetExtender
Summary
by MITRE • 10/25/2023
A local privilege escalation vulnerability in SonicWall Net Extender MSI client for Windows 10.2.336 and earlier versions allows a local low-privileged user to gain system privileges through running repair functionality.
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Analysis
by VulDB Data Team • 09/20/2024
The vulnerability identified as CVE-2023-44217 represents a critical local privilege escalation flaw within the SonicWall Net Extender MSI client for Windows platforms. This security weakness affects versions 10.2.336 and earlier, where a local attacker with minimal system access can exploit the repair functionality to elevate their privileges to system level. The issue stems from improper privilege handling within the client software's repair mechanisms, creating an attack vector that bypasses standard Windows security controls and allows unauthorized users to gain elevated access.
The technical implementation of this vulnerability involves the repair functionality within the SonicWall client software that fails to properly validate or restrict privilege levels during execution. When a user invokes the repair process, the system does not adequately verify whether the executing user possesses sufficient privileges to perform system-level operations. This flaw creates a path where a low-privileged user can manipulate the repair process to execute commands with elevated permissions, effectively bypassing the standard Windows user access control mechanisms. The vulnerability specifically manifests when the repair functionality attempts to access or modify system resources that require administrative privileges, yet the software does not enforce proper privilege separation during these operations.
From an operational impact perspective, this vulnerability poses significant risks to organizations relying on SonicWall Net Extender clients for remote access management. A successful exploitation could allow attackers to establish persistent system-level access, potentially leading to complete system compromise and unauthorized data access. The attack vector is particularly concerning as it requires minimal prerequisites, making it accessible to threat actors with basic system access. The vulnerability undermines the security posture of affected organizations by providing a straightforward method for privilege escalation that could be exploited to gain access to sensitive network resources, administrative accounts, and confidential data stored on the compromised systems.
The vulnerability aligns with CWE-787, representing an out-of-bounds write condition that occurs when the repair functionality fails to properly validate input parameters before executing privileged operations. This weakness is categorized under the broader ATT&CK technique T1068, which describes local privilege escalation through the exploitation of system vulnerabilities. Organizations should implement immediate mitigations including applying the vendor-provided patches, restricting user access to the repair functionality, and monitoring for unauthorized execution of repair processes. System administrators should also consider implementing additional security controls such as application whitelisting, privilege monitoring, and regular security assessments to detect and prevent exploitation attempts. The remediation process requires careful consideration of the repair functionality's impact on system maintenance and user operations while ensuring that privilege escalation pathways are properly secured.
This vulnerability highlights the importance of proper privilege management within client software applications and demonstrates how seemingly routine maintenance functions can become security attack vectors. The flaw underscores the need for comprehensive security testing of all system components, particularly those with elevated privilege requirements, and emphasizes the critical role of timely patch management in maintaining organizational security defenses against known vulnerabilities. Organizations should conduct thorough risk assessments to determine the scope of potential exploitation and implement layered security controls to protect against similar privilege escalation attacks across their IT infrastructure.