CVE-2017-7761

Description

The Mozilla Maintenance Service "helper.exe" application creates a temporary directory writable by non-privileged users. When this is combined with creation of a junction (a form of symbolic link), protected files in the target directory of the junction can be deleted by the Mozilla Maintenance Service, which has privileged access. Note: This attack requires local system access and only affects Windows. Other operating systems are not affected. This vulnerability affects Firefox ESR < 52.2 and Firefox < 54.

Weakness classification

• CWE-276: Incorrect Default Permissions

Primary references

• security@mozilla.org — Third Party Advisory, VDB Entry
• security@mozilla.org — Third Party Advisory, VDB Entry
• security@mozilla.org — Issue Tracking, Vendor Advisory
• security@mozilla.org — Issue Tracking, Third Party Advisory
• security@mozilla.org — Vendor Advisory
• security@mozilla.org — Vendor Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory, VDB Entry
• af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory, VDB Entry
• af854a3a-2127-422b-91ae-364da2661108 — Issue Tracking, Vendor Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Issue Tracking, Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Vendor Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Vendor Advisory