[ASA-202010-5] lua: arbitrary code execution

[Morten Linderud]

Arch Linux Security Advisory ASA-202010-5
=========================================

Severity: High
Date    : 2020-10-18
CVE-ID  : CVE-2020-15888 CVE-2020-15889
Package : lua
Type    : arbitrary code execution
Remote  : Yes
Link    : https://security.archlinux.org/AVG-1207

Summary
=======

The package lua before version 5.4.1-1 is vulnerable to arbitrary code
execution.

Resolution
==========

Upgrade to 5.4.1-1.

# pacman -Syu "lua>=5.4.1-1"

The problems have been fixed upstream in version 5.4.1.

Workaround
==========

None.

Description
===========

- CVE-2020-15888 (arbitrary code execution)

Lua through 5.4.0 mishandles the interaction between stack resizes and
garbage collection, leading to a heap-based buffer overflow, heap-based
buffer over-read, or use-after-free.

- CVE-2020-15889 (arbitrary code execution)

Lua through 5.4.0 has a getobjname heap-based buffer over-read because
youngcollection in lgc.c uses markold for an insufficient number of
list members.

Impact
======

A remote attacker is capable of executing arbitrary code on the
affected host.

References
==========

http://lua-users.org/lists/lua-l/2020-07/msg00053.html
http://lua-users.org/lists/lua-l/2020-07/msg00054.html
http://lua-users.org/lists/lua-l/2020-07/msg00071.html
http://lua-users.org/lists/lua-l/2020-07/msg00079.html
https://github.com/lua/lua/commit/6298903e35217ab69c279056f925fb72900ce0b7
https://github.com/lua/lua/commit/eb41999461b6f428186c55abd95f4ce1a76217d5
http://lua-users.org/lists/lua-l/2020-07/msg00078.html
https://github.com/lua/lua/commit/127e7a6c8942b362aa3c6627f44d660a4fb75312
https://security.archlinux.org/CVE-2020-15888
https://security.archlinux.org/CVE-2020-15889
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