CVE-2017-7761

MEDIUM

Firefox < 52.2.0 - Privilege Escalation via Maintenance Service Junction Attack

Title source: llm

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.

References (6)

Core 6

Core References

Third Party Advisory, VDB Entry vdb-entry x_refsource_bid

http://www.securityfocus.com/bid/99057

Issue Tracking, Vendor Advisory x_refsource_confirm

https://bugzilla.mozilla.org/show_bug.cgi?id=1215648

Vendor Advisory x_refsource_confirm

https://www.mozilla.org/security/advisories/mfsa2017-15/

Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack

http://www.securitytracker.com/id/1038689

Issue Tracking, Third Party Advisory x_refsource_misc

https://sourceforge.net/p/nsis/bugs/1125/

Vendor Advisory x_refsource_confirm

https://www.mozilla.org/security/advisories/mfsa2017-16/

Scores

CVSS v3 5.5

EPSS 0.0009

EPSS Percentile 24.7%

Attack Vector LOCAL

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Details

CWE

CWE-276

Status published

Products (1)

mozilla/firefox < 52.2.0

Published Jun 11, 2018

Tracked Since Feb 18, 2026