Bug 1771026 (CVE-2019-16707) - CVE-2019-16707 hunspell: out-of-bounds read in SuggestMgr::leftcommonsubstring in suggestmgr.cxx
Summary: CVE-2019-16707 hunspell: out-of-bounds read in SuggestMgr::leftcommonsubstrin...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-16707
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1771027 1771028 1771029 1775556
Blocks: 1771030
TreeView+ depends on / blocked
 
Reported: 2019-11-11 18:28 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-02-16 21:05 UTC (History)
11 users (show)

Fixed In Version:
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Last Closed: 2020-09-29 21:58:51 UTC
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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2020:3971 0 None None None 2020-09-29 20:13:53 UTC

Description Guilherme de Almeida Suckevicz 2019-11-11 18:28:38 UTC 
Hunspell 1.7.0 has an invalid read operation in SuggestMgr::leftcommonsubstring in suggestmgr.cxx.

Reference:
https://github.com/butterflyhack/hunspell-crash
Comment 1 Guilherme de Almeida Suckevicz 2019-11-11 18:28:57 UTC 
Created hunspell tracking bugs for this issue:

Affects: fedora-all [bug 1771027]


Created mingw-hunspell tracking bugs for this issue:

Affects: epel-7 [bug 1771029]
Affects: fedora-all [bug 1771028]
Comment 2 Caolan McNamara 2019-11-12 09:14:24 UTC 
Can't reproduce this yet, but I feel this can only happen with an empty .dic or near-empty .dic
Comment 3 Caolan McNamara 2019-11-12 17:33:24 UTC 
See https://github.com/hunspell/hunspell/issues/624 for how to reproduce
Comment 4 Caolan McNamara 2019-11-12 20:09:34 UTC 
https://github.com/hunspell/hunspell/commit/ac938e2ecb48ab4dd21298126c7921689d60571b
Comment 6 Stefan Cornelius 2019-11-21 18:43:02 UTC 
RHEL8 is compiled with -D_GLIBCXX_ASSERTIONS. The assertions always catch this case before we reach the out-of-bounds read and abort() the application.
Comment 8 Stefan Cornelius 2019-11-22 12:25:41 UTC 
Statement:

This is unlikely to be an issue in a real world scenario, as it requires specially crafted Hunspell dictionaries, which are not shipped with Red Hat Enterprise Linux. Additionally, applications using Hunspell will likely filter out invalid input before passing it on, which further limits the impact.
Comment 9 errata-xmlrpc 2020-09-29 20:13:51 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:3971 https://access.redhat.com/errata/RHSA-2020:3971
Comment 10 Product Security DevOps Team 2020-09-29 21:58:51 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-2019-16707
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