CVE-2017-7761

low-risk
Published 2018-06-11

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.

Do I need to act?

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0.09% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.5/10 Medium
LOCAL / LOW complexity

Affected Products (1)

Affected Vendors

Mozilla

References (12)

Third Party Advisory http://www.securityfocus.com/bid/99057
Third Party Advisory http://www.securitytracker.com/id/1038689
Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1215648
Issue Tracking https://sourceforge.net/p/nsis/bugs/1125/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2017-15/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2017-16/
Third Party Advisory http://www.securityfocus.com/bid/99057
Third Party Advisory http://www.securitytracker.com/id/1038689
Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1215648
Issue Tracking https://sourceforge.net/p/nsis/bugs/1125/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2017-15/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2017-16/
23
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal