Vulnerability Details : 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.
Products affected by CVE-2017-7761
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2017-7761
0.06%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 23 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2017-7761
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
3.6
|
LOW | AV:L/AC:L/Au:N/C:N/I:P/A:P |
3.9
|
4.9
|
NIST | |
|
5.5
|
MEDIUM | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
1.8
|
3.6
|
NIST |
CWE ids for CVE-2017-7761
-
During installation, installed file permissions are set to allow anyone to modify those files.Assigned by: nvd@nist.gov (Primary)
References for CVE-2017-7761
-
http://www.securityfocus.com/bid/99057
Mozilla Firefox Multiple Security VulnerabilitiesThird Party Advisory;VDB Entry
-
http://www.securitytracker.com/id/1038689
Mozilla Firefox Multiple Bugs Let Remote Users Spoof URLs, Obtain Potentially Sensitive Information, and Execute Arbitrary Code and Let Local Users Gain Elevated Privileges - SecurityTrackerThird Party Advisory;VDB Entry
-
https://www.mozilla.org/security/advisories/mfsa2017-15/
Security vulnerabilities fixed in Firefox 54 — MozillaVendor Advisory
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https://www.mozilla.org/security/advisories/mfsa2017-16/
Security vulnerabilities fixed in Firefox ESR 52.2 — MozillaVendor Advisory
-
https://bugzilla.mozilla.org/show_bug.cgi?id=1215648
1215648 - (CVE-2017-7761) Maintenance Service helper.exe File Deletion Elevation of PrivilegeIssue Tracking;Vendor Advisory
-
https://sourceforge.net/p/nsis/bugs/1125/
NSIS: Nullsoft Scriptable Install System / Bugs / #1125 Code execution / Privilege escalation problems with NSIS installersIssue Tracking;Third Party Advisory
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