When the Mozilla Updater opens a MAR format file which contains a very long item filename, an out-of-bounds write can be triggered, leading to a potentially exploitable crash. This requires running the Mozilla Updater manually on the local system with the malicious MAR file in order to occur. This vulnerability affects Firefox < 62, Firefox ESR < 60.2, and Thunderbird < 60.2.1.
http://www.securityfocus.com/bid/105280
http://www.securitytracker.com/id/1041610
https://access.redhat.com/errata/RHSA-2018:2692
https://access.redhat.com/errata/RHSA-2018:2693
https://access.redhat.com/errata/RHSA-2018:3403
https://access.redhat.com/errata/RHSA-2018:3458
https://bugzilla.mozilla.org/show_bug.cgi?id=1473113
https://lists.debian.org/debian-lts-announce/2018/11/msg00011.html
https://security.gentoo.org/glsa/201810-01
https://security.gentoo.org/glsa/201811-13
https://www.debian.org/security/2018/dsa-4327
https://www.mozilla.org/security/advisories/mfsa2018-20/
Source: MITRE
Published: 2018-10-18
Updated: 2018-12-06
Type: CWE-787
Base Score: 4.6
Vector: AV:L/AC:L/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 3.9
Severity: MEDIUM
Base Score: 7.8
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 1.8
Severity: HIGH