Vulnerability in Microsoft Windows
CVE-2017-7761
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (21.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 21.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Microsoft Windows
- Mozilla Firefox — versions unspecified
- Mozilla Firefox Esr — versions unspecified
Weakness classification (CWE)
References
- www.securityfocus.com/bid/99057 (VDB Entry, Third Party Advisory, vdb-entry)
- bugzilla.mozilla.org/show_bug.cgi (Issue Tracking, Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2017-15/ (Vendor Advisory)
- www.securitytracker.com/id/1038689 (VDB Entry, Third Party Advisory, vdb-entry)
- sourceforge.net/p/nsis/bugs/1125/ (Third Party Advisory, Issue Tracking)
- www.mozilla.org/security/advisories/mfsa2017-16/ (Vendor Advisory)
Frequently asked questions
- What is CVE-2017-7761?
- CVE-2017-7761 is a medium-severity vulnerability in Microsoft Windows, classified under Incorrect Default Permissions. CVSS score: 5.5/10. Published 2018-06-11.
- How severe is CVE-2017-7761?
- Medium severity. CVSS v3 base score is 5.5 out of 10.