Bug 1764299 (CVE-2019-20433)

Summary:	CVE-2019-20433 aspell: UCS-2 and UCS-4 null-terminated string handling OOB read
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	jchaloup, mrehak, nforro
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	aspell 0.60.8	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-25 09:55:46 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:	1764300, 1795218, 1795219
Bug Blocks:	1764301, 1795260

Description Guilherme de Almeida Suckevicz 2019-10-22 16:54:43 UTC

Potentially unbounded buffer over-read as Aspell looks for the non-existent multi-byte null terminator if the encoding is set to "ucs-2" or "ucs-4" outside of the application, from configuration file or environment variable, and a normal null-terminated string (for example UTF-8) is used.

References:
https://lists.gnu.org/archive/html/aspell-announce/2019-08/msg00000.html
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=935128

Comment 1 Guilherme de Almeida Suckevicz 2019-10-22 16:54:54 UTC

Created aspell tracking bugs for this issue:

Affects: fedora-all [bug 1764300]

Comment 2 Stefan Cornelius 2019-12-10 15:16:33 UTC

Patch:
https://github.com/GNUAspell/aspell/commit/de29341638833ba7717bd6b5e6850998454b044b

NOTE: This patch will break existing applications under certain conditions.

Upstream recommends this additional patch to increase the version:
https://github.com/GNUAspell/aspell/commit/cefd447e5528b08bb0cd6656bc52b4255692cefc

Comment 6 Stefan Cornelius 2020-02-06 12:39:52 UTC

*** Bug 1795259 has been marked as a duplicate of this bug. ***