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.

Category

5.5
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.06%
Vendor Advisory mozilla.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org
Affected: Mozilla Firefox ESR
Affected: Mozilla Firefox
Published at:
Updated at:

References

Link Tags
http://www.securityfocus.com/bid/99057 vdb entry third party advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1215648 issue tracking vendor advisory
https://www.mozilla.org/security/advisories/mfsa2017-15/ vendor advisory
http://www.securitytracker.com/id/1038689 vdb entry third party advisory
https://sourceforge.net/p/nsis/bugs/1125/ issue tracking third party advisory
https://www.mozilla.org/security/advisories/mfsa2017-16/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2017-7761?
CVE-2017-7761 has been scored as a medium severity vulnerability.
How to fix CVE-2017-7761?
To fix CVE-2017-7761, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-7761 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2017-7761 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2017-7761?
CVE-2017-7761 affects Mozilla Firefox ESR, Mozilla Firefox.
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