Bug 1873239 (CVE-2020-14373)

Summary:	CVE-2020-14373 ghostscript: use-after-free vulnerability in igc_reloc_struct_ptr() could result in DoS
Product:	[Other] Security Response	Reporter:	Todd Cullum <tcullum>
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, mosvald, security-response-team, zdohnal
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	ghostscript 9.26rc1	Doc Type:	If docs needed, set a value
Doc Text:	A use-after-free flaw was found in igc_reloc_struct_ptr() of psi/igc.c of Ghostscript-9.25. This flaw allows a local attacker to supply a specially crafted PDF file, causing a denial of service. The highest threat from this vulnerability is to system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-05-18 20:36:06 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:	1874585, 1874586
Bug Blocks:	1873243

Description Todd Cullum 2020-08-27 17:03:52 UTC

When a crafted PDF is supplied to ghostscript-9.25, it triggers a use-after-free in igc_reloc_struct_ptr() of psi/igc.c on line 1279.

Comment 4 Todd Cullum 2020-09-01 15:57:37 UTC

Upstream patch: https://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=ece5cbbd9979cd35737b00e68267762d72feb2ea;hp=1ef5f08f2c2e27efa978f0010669ff22355c385f

Upstream bug: https://bugs.ghostscript.com/show_bug.cgi?id=702851

Comment 5 Todd Cullum 2020-09-01 16:17:54 UTC

Acknowledgments:

Name: Todd Cullum (Red Hat)
Upstream: Suhwan

Comment 6 Todd Cullum 2020-09-01 16:26:13 UTC

Flaw summary:

Improper handling of font could cause a use-after-free in igc_reloc_struct_ptr() when an attacker provided a crafted PDF file. The aforementioned upstream patch resolved this flaw.

Comment 9 errata-xmlrpc 2021-05-18 15:37:28 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 10 Product Security DevOps Team 2021-05-18 20:36:06 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-2020-14373