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CVE-2023-43115

Published: 18 September 2023

In Artifex Ghostscript through 10.01.2, gdevijs.c in GhostPDL can lead to remote code execution via crafted PostScript documents because they can switch to the IJS device, or change the IjsServer parameter, after SAFER has been activated. NOTE: it is a documented risk that the IJS server can be specified on a gs command line (the IJS device inherently must execute a command to start the IJS server).

Notes

AuthorNote
rodrigo-zaiden
the risk of having programs being executed with IJS server
is documented in the start of the devices/gdevijs.c source file and in
the online documentation:
https://ghostscript.readthedocs.io/en/gs10.02.0/Devices.html#ijs-inkjet-and-other-raster-devices
"Note also that if -dSAFER is not specified, it’s possible for PostScript
code to set this parameter, so it can cause arbitrary code to be executed."
the commit that fixes this issue makes it clear that there
is no way to properly validate it. what the fix does is to provide a minimal
guard based on file opening path validation. it will prevent PostScript
programs switching to the IJS device after SAFER has been activated.
file opening path validation was added in version 9.28,
with commmit 9de16a6637b73e35f79d2d622de403b24e6502f2, so in Ubuntu it
is applicable starting from focal, for previous versions, the remediation
is not applicable.
applying file opening path validation for older versions
sounds risky and could possible bring other problems.

Priority

Medium

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package Release Status
ghostscript
Launchpad, Ubuntu, Debian
trusty Ignored
(end of standard support)
bionic Ignored
(patch not applicable)
upstream
Released (10.02.0~dfsg-1, 10.02.0)
xenial Ignored
(patch not applicable)
focal
Released (9.50~dfsg-5ubuntu4.11)
jammy
Released (9.55.0~dfsg1-0ubuntu5.5)
lunar
Released (10.0.0~dfsg1-0ubuntu1.4)
mantic
Released (10.01.2~dfsg1-0ubuntu2.1)
Patches:
upstream: https://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=e59216049cac290fb437a04c4f41ea46826cfba5

Severity score breakdown

Parameter Value
Base score 9.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H