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.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2018-12379 from the MITRE CVE dictionary dictionary and NIST NVD.
This flaw cannot be exploited through email in Thunderbird as scripting is disabled in this for email content. It may be possible to exploit through Feeds (Atom or RSS) or other browser-like contexts.
| CVSS3 Base Score | 6.1 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | Required |
| Scope | Changed |
| Confidentiality | Low |
| Integrity Impact | Low |
| Availability Impact | None |
| Platform | Errata | Release Date |
|---|---|---|
| Red Hat Enterprise Linux 6 (firefox) | RHSA-2018:2693 | 2018-09-12 |
| Red Hat Enterprise Linux 7 (firefox) | RHSA-2018:2692 | 2018-09-12 |
| Red Hat Enterprise Linux 7 (thunderbird) | RHSA-2018:3458 | 2018-11-05 |
| Red Hat Enterprise Linux 6 (thunderbird) | RHSA-2018:3403 | 2018-10-30 |
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