Date: Thu, 19 Jul 2018 21:13:42 -0400 From: Iris Morelle <shadowm2006@...il.com> To: oss-security@...ts.openwall.com Subject: CVE request: Wesnoth arbitrary code execution/sandbox escape Hello, We've found an issue in our software, "The Battle for Wesnoth", which allows arbitrary code execution by exploiting a vulnerability within the Lua scripting language engine which allows escaping existing sandbox measures in place and executing untrusted bytecode. We would like to have a CVE id assigned to this issue if possible. Description: The Wesnoth game engine uses the vanilla Lua programming language library to implement most of its game scripting capabilities. Lua is able to execute bytecode using its load(), loadfile(), loadstring(), dofile(), and require() functions. Wesnoth in particular exposes load(), loadstring(), and two wrappers for the former in the form of wesnoth.dofile() and wesnoth.require(), without making sure to disable the ability to load and execute bytecode. It has been documented  that it is possible to exploit the Lua load functions to execute untrusted bytecode that can then bypass sandbox measures, or even gain and abuse special knowledge about the process' memory layout.  https://gist.github.com/corsix/6575486 Wesnoth executes Lua code from untrusted local files either written by players or downloaded through a player content distribution server, as well as from data sent over the network in multiplayer games; thus this vulnerability is rather severe as it can be exploited remotely by malicious parties without the user's knowledge. This issue was found by Daniel Dräger, a Wesnoth developer, and author of an unmerged patch fixing it. Affected versions: All existing versions of Wesnoth with the Lua scripting capability, i.e. versions 1.7.0 through 1.14.3. -- Regards Iris Morelle, Wesnoth developer
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