[ASA-202107-10] mruby: arbitrary code execution

[Jonas Witschel]

Arch Linux Security Advisory ASA-202107-10
==========================================

Severity: Medium
Date    : 2021-07-01
CVE-ID  : CVE-2020-36401
Package : mruby
Type    : arbitrary code execution
Remote  : Yes
Link    : https://security.archlinux.org/AVG-2116

Summary
=======

The package mruby before version 3.0.0-1 is vulnerable to arbitrary
code execution.

Resolution
==========

Upgrade to 3.0.0-1.

# pacman -Syu "mruby>=3.0.0-1"

The problem has been fixed upstream in version 3.0.0.

Workaround
==========

None.

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

mruby 2.1.2 has a double free in mrb_default_allocf (called from
mrb_free and obj_free).

Impact
======

An attacker could execute arbitrary code through a use after free.

References
==========

https://github.com/google/oss-fuzz-vulns/blob/main/vulns/mruby/OSV-2020-744.yaml
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=23801
https://github.com/mruby/mruby/commit/97319697c8f9f6ff27b32589947e1918e3015503
https://security.archlinux.org/CVE-2020-36401
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