Bug 1720001 (CVE-2019-11703)

Summary:	CVE-2019-11703 libical: Heap buffer over read in icalparser.c parser_get_next_char
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	cschalle, debarshir, gecko-bugs-nobody, gecko-bugs-nobody, jhorak, john.j5live, kengert, mcrha, mrehak, pjasicek, rdieter, rhughes, rstrode, sandmann, security-response-team, stransky
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	Thunderbird 60.7.1, libical 2.0.0	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-27 03:34:37 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:	1720053, 1720054, 1720055, 1720056, 1720057, 1720422
Bug Blocks:	1720012

Description Pedro Sampaio 2019-06-12 22:02:16 UTC

A flaw was found in Mozilla Thunderbird. A Heap-based buffer over read in parser_get_next_char function in icalparser.c might lead to application crash. 

Upstream bug:

https://bugzilla.mozilla.org/show_bug.cgi?id=1553820

Comment 6 Milan Crha 2019-06-13 08:39:00 UTC

Is this for Thunderbird only, or the libical package is also affected? I would verify that myself, but I do not have access to any related bug report mentioned here, neither to the upstream Mozilla bug.

Comment 7 Doran Moppert 2019-06-14 00:46:54 UTC

External References:

https://www.mozilla.org/en-US/security/advisories/mfsa2019-17/

Comment 8 Doran Moppert 2019-06-14 00:46:56 UTC

Mitigation:

Thunderbird can be configured to use icaljs instead of libical by setting `calendar.icaljs = true` in preferences, mitigating this vulnerability.

Comment 9 Doran Moppert 2019-06-14 00:51:58 UTC

Created thunderbird tracking bugs for this issue:

Affects: fedora-all [bug 1720422]

Comment 10 Marian Rehak 2019-06-14 11:51:28 UTC

References:

https://www.openwall.com/lists/oss-security/2019/06/13/2

Comment 11 Doran Moppert 2019-06-20 07:02:28 UTC

This function reads from a string provided by its caller.  Prior to upstream commit 9a6b85328 (pre v2.0.0, 2015-08-11), the way it handled quotes made it possible to read out of bounds of the string provided.  No pointer-based writes are possible.

Comment 12 errata-xmlrpc 2019-06-27 09:18:40 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2019:1623 https://access.redhat.com/errata/RHSA-2019:1623

Comment 13 errata-xmlrpc 2019-06-27 10:12:27 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2019:1624 https://access.redhat.com/errata/RHSA-2019:1624

Comment 14 errata-xmlrpc 2019-06-27 10:14:59 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:1626 https://access.redhat.com/errata/RHSA-2019:1626