CVE-2016-3943 in Endpoint Administration Agent
Summary
by MITRE
Panda Endpoint Administration Agent before 7.50.00, as used in Panda Security for Business products for Windows, uses a weak ACL for the Panda Security/WaAgent directory and sub-directories, which allows local users to gain SYSTEM privileges by modifying an executable module.
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Analysis
by VulDB Data Team • 05/15/2025
The vulnerability identified as CVE-2016-3943 represents a critical privilege escalation flaw within Panda Endpoint Administration Agent versions prior to 7.50.00, affecting Panda Security for Business products deployed on Windows operating systems. This issue stems from improper access control list configurations that create exploitable pathways for local adversaries to elevate their privileges to the highest system level. The flaw specifically targets the Panda Security/WaAgent directory structure and its associated subdirectories, where weak permissions allow unauthorized modification of critical executable components.
The technical implementation of this vulnerability involves the manipulation of file system permissions within the agent's directory structure. When the Panda Endpoint Administration Agent installs on a Windows system, it creates the Panda Security/WaAgent directory with insufficient access controls that permit local users to modify executable files within this protected namespace. This weakness aligns with CWE-276, which addresses incorrect permissions for critical resources, and represents a classic case of inadequate least privilege enforcement. The vulnerability operates under the principle that local users should not be able to modify system-critical components without appropriate authorization, yet the flawed ACL implementation permits such modifications.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass potential full system compromise. An attacker who successfully exploits this weakness can gain SYSTEM privileges, which provides complete control over the affected Windows system. This includes the ability to install malicious software, modify system configurations, access all user data, and potentially establish persistence mechanisms. The attack vector is particularly concerning because it requires only local user access, making it exploitable in scenarios where attackers have already gained initial access to a system but need to escalate their privileges to achieve more significant objectives. This vulnerability directly maps to ATT&CK technique T1068, which covers privilege escalation through local exploitation of system vulnerabilities.
The remediation for this vulnerability requires immediate patching of the Panda Endpoint Administration Agent to version 7.50.00 or later, which addresses the weak ACL configuration in the Panda Security/WaAgent directory structure. Organizations should also conduct comprehensive security audits to verify that no other similar weak permissions exist within their Panda Security installations. System administrators should review and enforce proper access control policies for all system directories, particularly those containing executable components. The fix implemented in version 7.50.00 demonstrates proper privilege management by ensuring that only authorized entities can modify critical system components, thereby preventing the exploitation path that previously existed. Additional mitigations include implementing regular security assessments of file system permissions and establishing monitoring procedures to detect unauthorized modifications to critical system directories.