Description

openssl_encrypt versions before 1.4.0 fail to apply sandbox restrictions in the default process isolation mode for plugin execution. Attackers can execute malicious plugins with unrestricted access to the filesystem, network, subprocess execution, and all Python modules.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.8",
  "pubDate": "2026-08-17T11:16:44.653Z",
  "pubdate": "2026-08-17T11:16:44.653Z",
  "executiveSummary": "A critical security vulnerability has been identified in openssl_encrypt versions prior to 1.4.0, specifically concerning the failure to enforce sandbox restrictions during plugin execution under the default process isolation mode. This architectural flaw allows malicious actors to execute arbitrary plugins that bypass intended security boundaries, gaining unrestricted access to the underlying filesystem, network interfaces, subprocess execution capabilities, and the entire namespace of Python modules. The primary impact of this vulnerability includes complete system compromise, unauthorized data exfiltration, and arbitrary code execution within the context of the hosting environment. The affected systems encompass any deployment utilizing vulnerable versions of openssl_encrypt with default process isolation configurations. The risk implications are severe, as an attacker with the capability to supply or influence plugin execution can escalate privileges and interact directly with host resources without authorization. Exploitation conditions rely on the execution of a malicious or manipulated plugin while the application operates in the default, unconstrained isolation mode. Remediation necessitates immediate upgrading to version 1.4.0 or later, where sandbox restriction logic is properly initialized and enforced during plugin lifecycle management.",
  "technicalDetails": "The vulnerability resides within the plugin execution subsystem of openssl_encrypt versions before 1.4.0, where the default process isolation mode fails to correctly instantiate and apply sandbox constraints. The root cause is an absence of proper security context enforcement during the initialization phase of plugin execution, leading to a breakdown in isolation boundaries between the host application and the executing plugin code. In a properly secured implementation, process isolation should restrict system calls, limit filesystem visibility, block unauthorized network sockets, and disable dangerous built-in modules or subprocess spawning. However, due to this flaw, plugins execute with the full privileges of the host process rather than within a restricted sandbox environment.\nThe attack flow proceeds as follows: First, an attacker identifies a target system running an affected version of openssl_encrypt where plugins can be introduced, loaded, or executed. Second, the attacker crafts a malicious plugin leveraging standard Python constructs that would normally be prohibited under sandboxed conditions, such as importing restricted modules, opening network sockets, reading or writing arbitrary files on the filesystem via standard file I/O operations, or spawning operating system processes using the subprocess module. Third, the attacker initiates the execution of the malicious plugin through the standard plugin loading mechanism. Fourth, because the default process isolation mode fails to apply the necessary security policies, the plugin executes without restriction. Finally, the attacker achieves complete post-exploitation impact, enabling arbitrary command execution, lateral movement, data theft, or persistence on the host system. The component responsible for this failure is the process isolation enforcement layer within the openssl_encrypt plugin architecture. Authentication and privilege requirements depend on the host application's interface for loading plugins, but no special privileges are required within the plugin context itself due to the total absence of restriction."
}