[ASA-201904-5] ghostscript: sandbox escape

[Remi Gacogne]

Arch Linux Security Advisory ASA-201904-5
=========================================

Severity: High
Date    : 2019-04-11
CVE-ID  : CVE-2019-3835 CVE-2019-3838
Package : ghostscript
Type    : sandbox escape
Remote  : Yes
Link    : https://security.archlinux.org/AVG-929

Summary
=======

The package ghostscript before version 9.27-1 is vulnerable to sandbox
escape.

Resolution
==========

Upgrade to 9.27-1.

# pacman -Syu "ghostscript>=9.27-1"

The problems have been fixed upstream in version 9.27.

Workaround
==========

None.

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

- CVE-2019-3835 (sandbox escape)

It was found that the superexec operator was available in the internal
dictionary.  A specially crafted PostScript file could use this flaw in
order to, for example, have access to the file system outside of the
constrains imposed by -dSAFER.

- CVE-2019-3838 (sandbox escape)

It was found that the forceput operator could be extracted from the
DefineResource method using methods similar to the ones described in
CVE-2019-6116. A specially crafted PostScript file could use this flaw
in order to, for example, have access to the file system outside of the
constrains imposed by -dSAFER.

Impact
======

A remote attacker is able to escape the sandbox via a specially crafted
PostScript document.

References
==========

https://bugs.archlinux.org/task/62102
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=2055917
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=d683d1e6
https://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=ed9fcd95bb01
https://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=a82601e8f95a
https://security.archlinux.org/CVE-2019-3835
https://security.archlinux.org/CVE-2019-3838

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