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Advisories

OpenS100 Portrayal Engine Unrestricted Lua Standard Library Access

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severity
critical
date
Affecting

  • OpenS100 < commit 753cf29

CWE
  • CWE-749 Exposed Dangerous Method or Function
  • CWE-829 Inclusion of Functionality from Untrusted Control Sphere
CVSS
9.4
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Credit
Hoyeon Cho, National Korea Maritime and Ocean University
Description
OpenS100 (the reference implementation S-100 viewer) prior to commit 753cf29 contain a remote code execution vulnerability via an unrestricted Lua interpreter. The Portrayal Engine initializes Lua using luaL_openlibs() without sandboxing or capability restrictions, exposing standard libraries such as 'os' and 'io' to untrusted portrayal catalogues. An attacker can provide a malicious S-100 portrayal catalogue containing Lua scripts that execute arbitrary commands with the privileges of the OpenS100 process when a user imports the catalogue and loads a chart.

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