Bug 1870229 (CVE-2020-16294)

Summary:	CVE-2020-16294 ghostscript: buffer overflow in epsc_print_page() in devices/gdevepsc.c could result in a DoS
Product:	[Other] Security Response	Reporter:	Michael Kaplan <mkaplan>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	amasferr, chazlett, deekej, jlyle, mosvald, twaugh, 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 20:35:22 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:	1870232, 1872066, 1872067
Bug Blocks:	1870273

Description Michael Kaplan 2020-08-19 15:11:29 UTC

A buffer overflow vulnerability in epsc_print_page() in devices/gdevepsc.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.

References:

https://bugs.ghostscript.com/show_bug.cgi?id=701794
https://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=89f58f1aa95b3482cadf6977da49457194ee5358

Comment 1 Michael Kaplan 2020-08-19 15:14:41 UTC

Created ghostscript tracking bugs for this issue:

Affects: fedora-all [bug 1870232]

Comment 4 Todd Cullum 2020-08-24 23:25:27 UTC

Flaw summary:

This flaw is an out-of-bounds read of global variables graphics_modes_9 and graphics_modes_24, which occurs in the epsc_print_page() routine in /devices/gdevepsc.c. the arrays are indexed like: graphics_modes_9[x_dpi / 60]. If x_dpi (which is parsed from the input file) is too large. x_dpi is set as (int)pdev->x_pixels_per_inch. The patch establishes a max_dpi and checks x_dpi against it to error out and avoid this flaw.

Comment 5 errata-xmlrpc 2021-05-18 15:36:56 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 6 Product Security DevOps Team 2021-05-18 20:35:22 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-2020-16294