Bug 1912912 (CVE-2020-35702)

Summary:	CVE-2020-35702 poppler: heap-based buffer overflow via a crafted PDF document
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	caillon+fedoraproject, feborges, gnome-sig, mclasen, mkasik, rdieter, rhughes, rstrode
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	poppler 21.01.0	Doc Type:	If docs needed, set a value
Doc Text:	A heap buffer overflow flaw was found in poppler. This flaw allows a remote attacker to provide a specially crafted PDF file that, when processed by the 'pdftops' program, leads to a crash or potential code execution. The highest threat from this vulnerability is to confidentiality and integrity as well as system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-03-01 19:01:50 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:
Bug Blocks:	1899505

Description Marian Rehak 2021-01-05 15:11:17 UTC

DCTStream::getChars in DCTStream.cc in Poppler 20.12.1 has a heap-based buffer overflow via a crafted PDF document. NOTE: later reports indicate that this only affects builds from Poppler git clones in late December 2020, not the 20.12.1 release. In this situation, it should NOT be considered a Poppler vulnerability. However, several third-party Open Source projects directly rely on Poppler git clones made at arbitrary times, and therefore the CVE remains useful to users of those projects.

Upstream Reference:

https://gitlab.freedesktop.org/poppler/poppler/-/issues/1011

Comment 2 Mauro Matteo Cascella 2021-03-01 13:54:59 UTC

Upstream fix:
https://gitlab.freedesktop.org/poppler/poppler/-/commit/ae614bf8ab42c9d0c7ac57ecdfdcbcfc4ff6c639

Comment 3 Mauro Matteo Cascella 2021-03-01 14:00:15 UTC

It looks like this flaw was introduced in Poppler 21.01.0 via commit [1] and fixed in the same release via commit ae614bf8ab (see previous comment).

[1] https://gitlab.freedesktop.org/poppler/poppler/-/commit/f1c3ded779582aef5f2cbaf29bc5da7a8eae6f69

Comment 4 Mauro Matteo Cascella 2021-03-01 14:03:36 UTC

Statement:

The versions of `poppler` as shipped with Red Hat Enterprise Linux are not affected by this flaw, as the vulnerable code was introduced in a newer version of the package.

Comment 6 Product Security DevOps Team 2021-03-01 19:01:50 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-2020-35702