Bug 1984609 (CVE-2021-36978)

Summary:	CVE-2021-36978 qpdf: heap-based buffer overflow in Pl_ASCII85Decoder::write() when a certain downstream write fails
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	twaugh, zdohnal
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	qpdf 10.1.0	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-07-22 12:05:57 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:	1984610, 1986720, 1986721
Bug Blocks:	1984611

Description Guilherme de Almeida Suckevicz 2021-07-21 18:35:33 UTC

QPDF 9.x through 9.1.1 and 10.x through 10.0.4 has a heap-based buffer overflow in Pl_ASCII85Decoder::write (called from Pl_AES_PDF::flush and Pl_AES_PDF::finish) when a certain downstream write fails.

Reference:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28262

Upstream patch:
https://github.com/qpdf/qpdf/commit/dc92574c10f3e2516ec6445b88c5d584f40df4e5

Comment 1 Guilherme de Almeida Suckevicz 2021-07-21 18:35:50 UTC

Created qpdf tracking bugs for this issue:

Affects: fedora-all [bug 1984610]

Comment 2 Zdenek Dohnal 2021-07-22 12:05:57 UTC

Fixed in 10.1.0 and later, already covered by Fedora's qpdf.

Comment 3 Zdenek Dohnal 2021-07-22 12:16:06 UTC

Sorry, the bad bug.