CVE-2017-7761 Information

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.

CVSS Vector

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Reference

http://www.securityfocus.com/bid/99057 http://www.securitytracker.com/id/1038689 https://bugzilla.mozilla.org/show_bug.cgi?id=1215648 https://sourceforge.net/p/nsis/bugs/1125/ https://www.mozilla.org/security/advisories/mfsa2017-15/ https://www.mozilla.org/security/advisories/mfsa2017-16/

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

5.5