CVE-2017-7761

Published: 11 June 2018

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.

Notes

Author	Note
chrisccoulson	Windows only

Priority

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package	Release	Status
firefox Launchpad, Ubuntu, Debian	trusty	Does not exist (trusty was not-affected)
	upstream	Released (54.0)
	xenial	Not vulnerable
	yakkety	Not vulnerable
	zesty	Not vulnerable

Severity score breakdown

Parameter	Value
Base score	5.5
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	None
Vector	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

References

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