Vulnerability Description
If Firefox is installed to a user-writable directory, the Mozilla Maintenance Service would execute updater.exe from the install location with system privileges. Although the Mozilla Maintenance Service does ensure that updater.exe is signed by Mozilla, the version could have been rolled back to a previous version which would have allowed exploitation of an older bug and arbitrary code execution with System Privileges. *Note: This issue only affected Windows operating systems. Other operating systems are unaffected.*. This vulnerability affects Firefox < 80, Thunderbird < 78.2, Thunderbird < 68.12, Firefox ESR < 68.12, and Firefox ESR < 78.2.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 80.0 |
| Mozilla | Firefox Esr | >= 68.0, < 68.12 |
| Mozilla | Thunderbird | >= 68.0, < 68.12 |
Related Weaknesses (CWE)
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1643199Issue TrackingPermissions RequiredVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-36/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-37/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-38/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-40/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-41/Release NotesVendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1643199Issue TrackingPermissions RequiredVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-36/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-37/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-38/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-40/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-41/Release NotesVendor Advisory
FAQ
What is CVE-2020-15663?
CVE-2020-15663 is a vulnerability with a CVSS score of 8.8 (HIGH). If Firefox is installed to a user-writable directory, the Mozilla Maintenance Service would execute updater.exe from the install location with system privileges. Although the Mozilla Maintenance Servi...
How severe is CVE-2020-15663?
CVE-2020-15663 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-15663?
Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird.