Arch Linux Security Advisory ASA-201811-3
========================================
Severity: High
Date    : 2018-11-06
CVE-ID  : CVE-2018-17961 CVE-2018-18073 CVE-2018-18284
Package : ghostscript
Type    : sandbox escape
Remote  : Yes
Link    : https://security.archlinux.org/AVG-786

Summary
======
The package ghostscript before version 9.25-4 is vulnerable to sandbox
escape.

Resolution
=========
Upgrade to 9.25-4.

# pacman -Syu "ghostscript>=9.25-4"

The problems have been fixed upstream but no release is available yet.

Workaround
=========
None.

Description
==========
- CVE-2018-17961 (sandbox escape)

Artifex Ghostscript 9.25 and earlier allows attackers to bypass a
sandbox protection mechanism via vectors involving errorhandler setup.

- CVE-2018-18073 (sandbox escape)

Artifex Ghostscript allows attackers to bypass a sandbox protection
mechanism by leveraging exposure of system operators in the saved
execution stack in an error object.

- CVE-2018-18284 (sandbox escape)

Artifex Ghostscript 9.25 and earlier allows attackers to bypass a
sandbox protection mechanism via vectors involving the 1Policy
operator.

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

References
=========
https://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=a54c9e61e7d02bbc620bcba9b1c208462a876afb
https://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=a5a9bf8c6a63aa4ac6874234fe8cd63e72077291
https://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=a6807394bd94b708be24758287b606154daaaed9
https://www.openwall.com/lists/oss-security/2018/10/09/4
https://bugs.chromium.org/p/project-zero/issues/detail?id=1682&desc=2
https://bugs.ghostscript.com/show_bug.cgi?id=699816
https://lists.debian.org/debian-lts-announce/2018/10/msg00013.html
https://www.exploit-db.com/exploits/45573
https://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=34cc326eb2c5695833361887fe0b32e8d987741c
http://packetstormsecurity.com/files/149758/Ghostscript-Exposed-System-Operators.html
https://www.openwall.com/lists/oss-security/2018/10/10/12
https://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=8d19fdf63f91f50466b08f23e2d93d37a4c5ea0b
https://www.openwall.com/lists/oss-security/2018/10/16/2
https://bugs.chromium.org/p/project-zero/issues/detail?id=1696
https://bugs.ghostscript.com/show_bug.cgi?id=699963
https://security.archlinux.org/CVE-2018-17961
https://security.archlinux.org/CVE-2018-18073
https://security.archlinux.org/CVE-2018-18284