[ASA-201901-18] ghostscript: sandbox escape

[Morten Linderud]

Arch Linux Security Advisory ASA-201901-18
==========================================

Severity: High
Date    : 2019-01-29
CVE-ID  : CVE-2019-6116
Package : ghostscript
Type    : sandbox escape
Remote  : Yes
Link    : https://security.archlinux.org/AVG-860

Summary
=======

The package ghostscript before version 9.26-2 is vulnerable to sandbox
escape.

Resolution
==========

Upgrade to 9.26-2.

# pacman -Syu "ghostscript>=9.26-2"

The problem has been fixed upstream but no release is available yet.

Workaround
==========

None.

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

It was found that ghostscript could leak sensitive operators on the
operand stack when a pseudo-operator pushes a subroutine. A specially
crafted PostScript file could use this flaw to escape the -dSAFER
protection in order to, for example, have access to the file system and
execute commands.

Impact
======

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

References
==========

https://marc.info/?l=oss-security&m=154825433813390
https://bugs.chromium.org/p/project-zero/issues/detail?id=1729&desc=2
https://bugs.ghostscript.com/show_bug.cgi?id=700317
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=13b0a36f8181db66a91bcc8cea139998b53a8996
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=2db98f9c66135601efb103d8db7d020a672308db
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=99f13091a3f309bdc95d275ea9fec10bb9f42d9a
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=59d8f4deef90c1598ff50616519d5576756b4495
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=2768d1a6dddb83f5c061207a7ed2813999c1b5c9
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=49c8092da88ef6bb0aa281fe294ae0925a44b5b9
https://security.archlinux.org/CVE-2019-6116
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