A mruby security update has been released for Debian GNU/Linux 9 LTS to address multiple security issues.

DLA 2996-1: mruby security update

- -------------------------------------------------------------------------
Debian LTS Advisory DLA-2996-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Abhijith PA
May 06, 2022   https://wiki.debian.org/LTS
- -------------------------------------------------------------------------

Package : mruby
Version : 1.2.0+20161228+git30d5424a-1+deb9u1
CVE ID : CVE-2017-9527 CVE-2018-10191 CVE-2018-11743 CVE-2018-12249
CVE-2018-14337 CVE-2020-15866

Multiple security issues were discovered in mruby, a lightweight
implementation of the Ruby language

CVE-2017-9527

heap-based use-after-free vulnerability allows attackers to cause
a denial of service or possibly have unspecified other impact via
a crafted .rb file

CVE-2018-10191

an integer overflow exists when handling OP_GETUPVAR in the
presence of deep scope nesting, resulting in a use-after-free. An
attacker that can cause Ruby code to be run can use this to
possibly execute arbitrary code

CVE-2018-11743

uninitialized pointer which allows attackers to cause a denial of
service or possibly have unspecified other impact.

CVE-2018-12249

There is a NULL pointer dereference in mrb_class_real because
"class BasicObject" is not properly supported in class.c.

CVE-2018-14337

a signed integer overflow, possibly leading to out-of-bounds
memory access because the mrb_str_resize function in string.c does
not check for a negative length

CVE-2020-15866

a heap-based buffer overflow in the mrb_yield_with_class function
in vm.c because of incorrect VM stack handling

For Debian 9 stretch, these problems have been fixed in version
1.2.0+20161228+git30d5424a-1+deb9u1.

We recommend that you upgrade your mruby packages.

For the detailed security status of mruby please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/mruby

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS