Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 62 | 62 |
| Mozilla | Firefox ESR | unspecified – < 60.2 | 60.2 |
| Mozilla | Thunderbird | unspecified – < 60.2.1 | 60.2.1 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | firefox-esr | 60.2.0esr-1 | — |
| Debian 14 | thunderbird | 1:60.2.1-1 | — |
| Debian 13 | firefox-esr | 60.2.0esr-1 | — |
| Debian 13 | thunderbird | 1:60.2.1-1 | — |
| Debian 12 | firefox-esr | 60.2.0esr-1 | — |
| Debian 12 | thunderbird | 1:60.2.1-1 | — |
| Debian 9 | thunderbird | 1:60.2.1-2~deb9u1 | DSA-4327-1 |
| Debian 8 | thunderbird | 1:60.3.0-1~deb8u1 | DLA-1575-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | firefox | 60.2.0-1.el7_5 | RHSA-2018:2692 |
| RHEL 7 | thunderbird | 60.2.1-4.el7_5 | RHSA-2018:3458 |
| RHEL 6 | firefox | 60.2.0-1.el6 | RHSA-2018:2693 |
| RHEL 6 | thunderbird | 60.2.1-5.el6 | RHSA-2018:3403 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | MozillaFirefox | 60.2.0-3.10.1 | SUSE-SU-2018:2890-1 |
| SLES 15 | MozillaFirefox-branding-SLE | 60-4.3.1 | SUSE-SU-2018:2890-1 |
| SLES 12 SP4 | MozillaFirefox | 60.2.2esr-109.46.1 | SUSE-SU-2018:3591-2 |
| SLES 12 SP4 | MozillaFirefox-branding-SLE | 60-32.3.1 | SUSE-SU-2018:3591-2 |
| SLES 12 SP4 | apache2-mod_nss | 1.0.14-19.6.3 | SUSE-SU-2018:3591-2 |
| SLES 12 SP4 | mozilla-nspr | 4.19-19.3.1 | SUSE-SU-2018:3591-2 |
| SLES 12 SP4 | mozilla-nss | 3.36.4-58.15.3 | SUSE-SU-2018:3591-2 |
| SLES 12 SP3 | MozillaFirefox | 60.2.2esr-109.46.1 | SUSE-SU-2018:3591-1 |
| SLES 12 SP3 | MozillaFirefox-branding-SLE | 60-32.3.1 | SUSE-SU-2018:3591-1 |
| SLES 12 SP3 | apache2-mod_nss | 1.0.14-19.6.3 | SUSE-SU-2018:3591-1 |
| SLES 12 SP3 | mozilla-nspr | 4.19-19.3.1 | SUSE-SU-2018:3591-1 |
| SLES 12 SP3 | mozilla-nss | 3.36.4-58.15.3 | SUSE-SU-2018:3591-1 |
| SLES 12 SP2 | MozillaFirefox | 60.2.2esr-109.46.1 | SUSE-SU-2018:3591-1 |
| SLES 12 SP2 | MozillaFirefox-branding-SLE | 60-32.3.1 | SUSE-SU-2018:3591-1 |
| SLES 12 SP2 | apache2-mod_nss | 1.0.14-19.6.3 | SUSE-SU-2018:3591-1 |
| SLES 12 SP2 | mozilla-nspr | 4.19-19.3.1 | SUSE-SU-2018:3591-1 |
| SLES 12 SP2 | mozilla-nss | 3.36.4-58.15.3 | SUSE-SU-2018:3591-1 |
| SLES 12 SP1 | MozillaFirefox | 60.2.2esr-109.46.1 | SUSE-SU-2018:3591-1 |
| SLES 12 SP1 | MozillaFirefox-branding-SLE | 60-32.3.1 | SUSE-SU-2018:3591-1 |
| SLES 12 SP1 | apache2-mod_nss | 1.0.14-19.6.3 | SUSE-SU-2018:3591-1 |
| SLES 12 SP1 | mozilla-nspr | 4.19-19.3.1 | SUSE-SU-2018:3591-1 |
| SLES 12 SP1 | mozilla-nss | 3.36.4-58.15.3 | SUSE-SU-2018:3591-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | MozillaFirefox | 60.2.2esr-109.46.1 | SUSE-SU-2018:3591-1 |
| SLES 12 | MozillaFirefox-branding-SLE | 60-32.3.1 | SUSE-SU-2018:3591-1 |
| SLES 12 | mozilla-nspr | 4.19-19.3.1 | SUSE-SU-2018:3591-1 |
| SLES 12 | mozilla-nss | 3.36.4-58.15.3 | SUSE-SU-2018:3591-1 |
| SLES for SAP 12 SP4 | MozillaFirefox | 60.2.2esr-109.46.1 | SUSE-SU-2018:3591-2 |
| SLES for SAP 12 SP4 | MozillaFirefox-branding-SLE | 60-32.3.1 | SUSE-SU-2018:3591-2 |
| SLES for SAP 12 SP4 | apache2-mod_nss | 1.0.14-19.6.3 | SUSE-SU-2018:3591-2 |
| SLES for SAP 12 SP4 | mozilla-nspr | 4.19-19.3.1 | SUSE-SU-2018:3591-2 |
| SLES for SAP 12 SP4 | mozilla-nss | 3.36.4-58.15.3 | SUSE-SU-2018:3591-2 |
| SLES for SAP 12 SP3 | MozillaFirefox | 60.2.2esr-109.46.1 | SUSE-SU-2018:3591-1 |
| SLES for SAP 12 SP3 | MozillaFirefox-branding-SLE | 60-32.3.1 | SUSE-SU-2018:3591-1 |
| SLES for SAP 12 SP3 | apache2-mod_nss | 1.0.14-19.6.3 | SUSE-SU-2018:3591-1 |
| SLES for SAP 12 SP3 | mozilla-nspr | 4.19-19.3.1 | SUSE-SU-2018:3591-1 |
| SLES for SAP 12 SP3 | mozilla-nss | 3.36.4-58.15.3 | SUSE-SU-2018:3591-1 |
| SLES for SAP 12 SP2 | MozillaFirefox | 60.2.2esr-109.46.1 | SUSE-SU-2018:3591-1 |
| SLES for SAP 12 SP2 | MozillaFirefox-branding-SLE | 60-32.3.1 | SUSE-SU-2018:3591-1 |
| SLES for SAP 12 SP2 | apache2-mod_nss | 1.0.14-19.6.3 | SUSE-SU-2018:3591-1 |
| SLES for SAP 12 SP2 | mozilla-nspr | 4.19-19.3.1 | SUSE-SU-2018:3591-1 |
| SLES for SAP 12 SP2 | mozilla-nss | 3.36.4-58.15.3 | SUSE-SU-2018:3591-1 |
| SLES for SAP 12 SP1 | MozillaFirefox | 60.2.2esr-109.46.1 | SUSE-SU-2018:3591-1 |
| SLES for SAP 12 SP1 | MozillaFirefox-branding-SLE | 60-32.3.1 | SUSE-SU-2018:3591-1 |
| SLES for SAP 12 SP1 | apache2-mod_nss | 1.0.14-19.6.3 | SUSE-SU-2018:3591-1 |
| SLES for SAP 12 SP1 | mozilla-nspr | 4.19-19.3.1 | SUSE-SU-2018:3591-1 |
| SLES for SAP 12 SP1 | mozilla-nss | 3.36.4-58.15.3 | SUSE-SU-2018:3591-1 |
| SUSE OpenStack Cloud 7 | MozillaFirefox | 60.2.2esr-109.46.1 | SUSE-SU-2018:3591-1 |
| SUSE OpenStack Cloud 7 | MozillaFirefox-branding-SLE | 60-32.3.1 | SUSE-SU-2018:3591-1 |
| SUSE OpenStack Cloud 7 | apache2-mod_nss | 1.0.14-19.6.3 | SUSE-SU-2018:3591-1 |
| SUSE OpenStack Cloud 7 | mozilla-nspr | 4.19-19.3.1 | SUSE-SU-2018:3591-1 |
| SUSE OpenStack Cloud 7 | mozilla-nss | 3.36.4-58.15.3 | SUSE-SU-2018:3591-1 |
| SUSE Enterprise Storage 4 | MozillaFirefox | 60.2.2esr-109.46.1 | SUSE-SU-2018:3591-1 |
| SUSE Enterprise Storage 4 | MozillaFirefox-branding-SLE | 60-32.3.1 | SUSE-SU-2018:3591-1 |
| SUSE Enterprise Storage 4 | apache2-mod_nss | 1.0.14-19.6.3 | SUSE-SU-2018:3591-1 |
| SUSE Enterprise Storage 4 | mozilla-nspr | 4.19-19.3.1 | SUSE-SU-2018:3591-1 |
| SUSE Enterprise Storage 4 | mozilla-nss | 3.36.4-58.15.3 | SUSE-SU-2018:3591-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 92.0-1.2 | openSUSE-SU-2024:10600-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | firefox | 60.2.0-1.0.1.el7_5 | ELSA-2018-2692 |
| Oracle Linux 7 | thunderbird | 60.2.1-4.0.1.el7_5 | ELSA-2018-3458 |
Advisories 13
- RHSA-2018:3458 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2018:3403 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2018:2692 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2018:2693 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-4327-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1575-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2018:2890-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10600-1 MozillaFirefox-92.0-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14572-1 firefox-esr-128.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3591-1 Security update for MozillaFirefox, MozillaFirefox-branding-SLE, llvm4, mozilla-nspr, mozilla-nss, apache2-mod_nss SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2018:3591-2 Security update for MozillaFirefox, MozillaFirefox-branding-SLE, llvm4, mozilla-nspr, mozilla-nss, apache2-mod_nss SUSE / openSUSE Security Updates · May 2, 2025
- ELSA-2018-3458 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 7, 2018
- ELSA-2018-2692 Critical: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 12, 2018
References
- 105280 vdb-entry
- GLSA-201810-01 vendor-advisory
- RHSA-2018:2693 vendor-advisory
- [debian-lts-announce] 20181112 [SECURITY] [DLA 1575-1] thunderbird security update mailing-list
- GLSA-201811-13 vendor-advisory
- DSA-4327 vendor-advisory
- RHSA-2018:3403 vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2018-20/
- 1041610 vdb-entry
- RHSA-2018:2692 vendor-advisory
- RHSA-2018:3458 vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2018-21/
- https://www.mozilla.org/security/advisories/mfsa2018-25/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1473113