Bug 1743737 (CVE-2019-14813) - CVE-2019-14813 ghostscript: Safer mode bypass by .forceput exposure in setsystemparams (701443)
Summary: CVE-2019-14813 ghostscript: Safer mode bypass by .forceput exposure in setsys...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-14813
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1744003 1744004 1744005 1744006 1747906
Blocks: 1743530
TreeView+ depends on / blocked
 
Reported: 2019-08-20 14:50 UTC by Cedric Buissart
Modified: 2021-02-16 21:28 UTC (History)
7 users (show)

Fixed In Version: ghostscript 9.50
Clone Of:
Environment:
Last Closed: 2019-09-02 13:07:22 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2019:2675 0 None None None 2019-09-05 17:27:41 UTC
Red Hat Product Errata RHSA-2019:2586 0 None None None 2019-09-02 07:54:02 UTC
Red Hat Product Errata RHSA-2019:2591 0 None None None 2019-09-02 07:54:24 UTC

Description Cedric Buissart 2019-08-20 14:50:37 UTC 
In Ghostscript 9.27, some ephemeral routines in setsystemparams can expose .forceput operator when hooking errors. This issue is similar to upstream bug https://bugs.ghostscript.com/show_bug.cgi?id=700317. 

http://git.ghostscript.com/?p=ghostpdl.git;a=blob;f=Resource/Init/gs_lev2.ps;h=98d55fe74251e2b8f384a0a97d0a92a9f88949b6;hb=ebfaa2db4cb518a2bc99c1532d4429201a13dfab#l227

 227          //pssystemparams 3 1 roll .forceput    % pssystemparams is read-only
 228        } executeonly
 229        { pop pop
 230        }
 231       ifelse
 232     }
 233    forall pop

Reference:
https://bugs.ghostscript.com/show_bug.cgi?id=701443
Comment 1 Cedric Buissart 2019-08-20 14:51:49 UTC 
Upstream fix :
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=885444fcbe10dc42787ecb76686c8ee4dd33bf33
Comment 4 Cedric Buissart 2019-08-21 06:42:57 UTC 
Mitigation:

Please refer to the "Mitigation" section of CVE-2018-16509 : https://access.redhat.com/security/cve/cve-2018-16509
Comment 10 Cedric Buissart 2019-08-27 15:21:33 UTC 
Acknowledgments:

Name: Artifex Software
Upstream: Hiroki MATSUKUMA (Cyber Defense Institute)
Comment 11 errata-xmlrpc 2019-09-02 07:54:01 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:2586 https://access.redhat.com/errata/RHSA-2019:2586
Comment 12 errata-xmlrpc 2019-09-02 07:54:23 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2019:2591 https://access.redhat.com/errata/RHSA-2019:2591
Comment 13 Cedric Buissart 2019-09-02 08:52:57 UTC 
Created ghostscript tracking bugs for this issue:

Affects: fedora-all [bug 1747906]
Comment 14 Product Security DevOps Team 2019-09-02 13:07:22 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-14813
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