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TI-2018-08880 Aliases CVE-2018-12379GHSA-77mg-phf5-3h8g

Out-of-bounds write in Mozilla Firefox

Priority LOW 34CWE-787Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.

Summary

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.

Why it matters now

EPSS 0.00393 33rd percentileScored 2026-11-07
Fix Fixed Firefox (Mozilla): 62Firefox ESR (Mozilla): 60.2+1 more productRed Hat: 4 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
MozillaFirefoxbefore 6262Patch availableCNA
MozillaFirefox ESRbefore 60.260.2Patch availableCNA
MozillaThunderbirdbefore 60.2.160.2.1Patch availableCNA
  • Firefox VendorMozilla Affected before 62 Fixed in 62 Patch available CNA
  • Firefox ESR VendorMozilla Affected before 60.2 Fixed in 60.2 Patch available CNA
  • Thunderbird VendorMozilla Affected before 60.2.1 Fixed in 60.2.1 Patch available CNA

CPE configurations NVD · 14

CPEVersionsRoleVendor
cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*6.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*6.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*7.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:*:*:*:*:*:*:*7.5VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:*7.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:*7.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*6.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
  • cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:*:*:*:*:*:*:* Versions 7.5 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
Show 4 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*8.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*before 60.2.0; before 62.0VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*before 60.2.1VulnerableMozilla
  • cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 60.2.0; before 62.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 60.2.1 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox (Mozilla) Fixed in 62
  • Fix · CNA Firefox ESR (Mozilla) Fixed in 60.2
  • Fix · CNA Thunderbird (Mozilla) Fixed in 60.2.1

Red Hat 4 advisories

  • RHSA-2018:3458 Released 2018-11-05 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux Client (v. 7) thunderbird-60.2.1-4.el7_5
    • Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-60.2.1-4.el7_5
    • Red Hat Enterprise Linux Workstation (v. 7) thunderbird-60.2.1-4.el7_5
    • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) thunderbird-60.2.1-4.el7_5
  • RHSA-2018:3403 Released 2018-10-30 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux Desktop (v. 6) thunderbird-60.2.1-5.el6
    • Red Hat Enterprise Linux Server Optional (v. 6) thunderbird-60.2.1-5.el6
    • Red Hat Enterprise Linux Workstation (v. 6) thunderbird-60.2.1-5.el6
  • RHSA-2018:2693 Released 2018-09-12 · Red Hat rating Critical
    firefox security update
    • Red Hat Enterprise Linux Desktop (v. 6) firefox-60.2.0-1.el6
    • Red Hat Enterprise Linux Desktop Optional (v. 6) firefox-60.2.0-1.el6
    • Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox-60.2.0-1.el6
    • Red Hat Enterprise Linux Server (v. 6) firefox-60.2.0-1.el6
    • Red Hat Enterprise Linux Server Optional (v. 6) firefox-60.2.0-1.el6
    • Red Hat Enterprise Linux Workstation (v. 6) firefox-60.2.0-1.el6
    • Red Hat Enterprise Linux Workstation Optional (v. 6) firefox-60.2.0-1.el6
Show 1 more Red Hat advisories
  • RHSA-2018:2692 Released 2018-09-12 · Red Hat rating Critical
    firefox security update
    • Red Hat Enterprise Linux Client (v. 7) firefox-60.2.0-1.el7_5
    • Red Hat Enterprise Linux Client Optional (v. 7) firefox-60.2.0-1.el7_5
    • Red Hat Enterprise Linux Server (v. 7) firefox-60.2.0-1.el7_5
    • Red Hat Enterprise Linux Server Optional (v. 7) firefox-60.2.0-1.el7_5
    • Red Hat Enterprise Linux Workstation (v. 7) firefox-60.2.0-1.el7_5
    • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-60.2.0-1.el7_5
    • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) firefox-60.2.0-1.el7_5

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Mozilla Firefox 62

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2018-08881 Manually dragging and dropping an Outlook email message into the browser will trigger a…Priority LOW 28
    • TI-2018-08882 Improper input validation in Mozilla FirefoxPriority LOW 27
    Show all 3 records →
  • Release ·

    Mozilla Firefox ESR 60.2

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2018-08881 Manually dragging and dropping an Outlook email message into the browser will trigger a…Priority LOW 28
    Show all 2 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2018:2692, RHSA-2018:3458
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2018:2692
Red Hat Enterprise Linux Desktop (v. 6)Fixed RHSA-2018:2693, RHSA-2018:3403
Red Hat Enterprise Linux Desktop Optional (v. 6)Fixed RHSA-2018:2693
Red Hat Enterprise Linux HPC Node Optional (v. 6)Fixed RHSA-2018:2693
Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2018:2693
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2018:2692
Red Hat Enterprise Linux Server Optional (v. 6)Fixed RHSA-2018:2693, RHSA-2018:3403
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2018:2692, RHSA-2018:3458
Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2018:2693, RHSA-2018:3403
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2018:2692, RHSA-2018:3458
Red Hat Enterprise Linux Workstation Optional (v. 6)Fixed RHSA-2018:2693
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2018:2692
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)Fixed RHSA-2018:2692
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7)Fixed RHSA-2018:3458

Timeline

  1. 2026-10-02 Threatist record created from CVE-2018-12379
  2. 2026-10-03 Alias added: GHSA-77mg-phf5-3h8g

References

Advisory 12

  • TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
  • TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
  • TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
  • TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
See all 3444 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences