CVE-2025-23010 in SonicWall NetExtender
Summary
by MITRE • 04/10/2025
An Improper Link Resolution Before File Access ('Link Following') vulnerability in SonicWall NetExtender Windows (32 and 64 bit) client which allows an attacker to manipulate file paths.
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Analysis
by VulDB Data Team • 04/19/2025
This vulnerability represents a critical improper link resolution issue that affects SonicWall NetExtender Windows client software across both 32-bit and 64-bit architectures. The flaw resides in how the client handles symbolic links and file path resolution during network access operations, creating potential attack vectors for privilege escalation and unauthorized file access. When the NetExtender client processes network connections or file transfers, it fails to properly validate or sanitize symbolic link references, allowing malicious actors to manipulate the intended file paths through crafted symbolic links that point to sensitive system locations.
The technical implementation of this vulnerability stems from inadequate input validation within the client's file access routines and path resolution mechanisms. Attackers can exploit this weakness by creating malicious symbolic links in strategic locations within the network filesystem or during the connection establishment process. When the vulnerable NetExtender client resolves these links, it follows them without proper authorization checks, potentially granting access to restricted files, directories, or system resources that should remain protected. This behavior aligns with CWE-382 which specifically addresses improper link resolution and falls under the broader category of path traversal vulnerabilities.
The operational impact of this vulnerability extends beyond simple unauthorized file access, creating potential for privilege escalation attacks and data exfiltration scenarios. An attacker who successfully exploits this flaw could manipulate the client to access sensitive configuration files, user credentials stored in network shares, or system binaries that are normally protected from direct access. This weakness is particularly dangerous in enterprise environments where NetExtender clients are commonly used for remote access to corporate networks, as it could allow attackers to bypass network security controls and gain elevated privileges within the organization's infrastructure. The vulnerability also aligns with ATT&CK technique T1078 which covers valid accounts usage and privilege escalation through legitimate system tools.
Organizations should implement immediate mitigations including disabling symbolic link processing in NetExtender client configurations where possible, applying the latest vendor patches, and implementing network segmentation controls that limit access to sensitive resources. Security teams should also monitor for suspicious symbolic link creation activities on systems running vulnerable NetExtender clients and consider implementing file integrity monitoring solutions. The vulnerability demonstrates the importance of proper path resolution validation in network client applications and underscores the need for comprehensive input sanitization across all file access operations, particularly in environments where remote access tools are extensively deployed.