cve/2017/CVE-2017-7761.md

### [CVE-2017-7761](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7761)
![](https://img.shields.io/static/v1?label=Product&message=Firefox%20ESR&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Firefox&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2052.2%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2054%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=File%20deletion%20and%20privilege%20escalation%20through%20Mozilla%20Maintenance%20Service%20helper.exe%20application&color=brighgreen)

### 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.

### POC

#### Reference
- https://bugzilla.mozilla.org/show_bug.cgi?id=1215648

#### Github
No PoCs found on GitHub currently.