Plugin Sandbox Bypass Through Module Import Obfuscation

openssl_encrypt versions before 1.4.0 suffer from a critical sandbox escape vulnerability that allows attackers to circumvent security controls designed to block dangerous module imports. The vulnerability stems from a mismatch between the PluginImportGuard blocklist and the AST analyzer's DANGEROUS_MODULES set, creating an exploitable gap. Attackers can leverage string obfuscation and encoding techniques to import restricted modules—including sys, shutil, multiprocessing, importlib, and pickle—enabling arbitrary code execution within what should be a sandboxed environment. This affects any organization deploying openssl_encrypt plugins without proper version controls, particularly those processing untrusted plugin code or user-supplied scripts.

While no specific MITRE ATT&CK technique mapping exists for this CVE, Casky's 754 security skills would detect the attack patterns associated with Defense Evasion and Execution techniques—particularly obfuscated import statements, encoding anomalies in string literals, and dynamic module loading patterns. Using Claude AI's extended reasoning, practitioners would see findings flagging suspicious code patterns such as base64-encoded import calls, ROT13 manipulations, or hex-encoded module names attempting to load dangerous libraries. Casky's analysis would highlight the divergence between declared and actual imported modules, identifying instances where AST analysis might miss obfuscated dangerous imports that bypass the plugin guard's static checks.