Bug 1870179 (CVE-2020-16295)

Summary: CVE-2020-16295 ghostscript: NULL pointer dereference in clj_media_size() in devices/gdevclj.c could result in a DoS
Product: [Other] Security Response Reporter: Michael Kaplan <mkaplan>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akostadi, amasferr, chazlett, deekej, dmayorov, jlledo, jlyle, mosvald, pantinor, rhel-process-autobot, tsedmik, twaugh, watson-tool-maintainers, zdohnal
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: ghostscript 9.51 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2021-05-18 20:35:15 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1870180, 1872046, 1872047    
Bug Blocks: 1870273    

Description Michael Kaplan 2020-08-19 13:28:03 UTC 
A null pointer dereference vulnerability in clj_media_size() in devices/gdevclj.c of Artifex Software GhostScript v9.50 allows a remote attacker to cause a denial of service via a crafted PDF file. This is fixed in v9.51.

Reference:

http://git.ghostscript.com/?p=ghostpdl.git;h=2c2dc335c212750e0fb8ae157063bc06cafa8d3e
https://bugs.ghostscript.com/show_bug.cgi?id=701796
Comment 1 Michael Kaplan 2020-08-19 13:28:21 UTC 
Created ghostscript tracking bugs for this issue:

Affects: fedora-all [bug 1870180]
Comment 3 Todd Cullum 2020-08-24 22:02:33 UTC 
Flaw summary:

This flaw is caused by an incorrect test for existence of parameter HWResolution in /devices/gdevclj.c's clj_media_size() routine. If HWResolution does not exist, the if statement test can pass and lead to a null pointer dereference or divide by zero error, crashing the process.
Comment 4 Todd Cullum 2020-08-24 22:03:08 UTC 
Mitigation:

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Comment 6 errata-xmlrpc 2021-05-18 15:36:51 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:1852 https://access.redhat.com/errata/RHSA-2021:1852
Comment 7 Product Security DevOps Team 2021-05-18 20:35:15 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-2020-16295