CVE-2018-12402 Information

Description

The internal WebBrowserPersist code does not use correct origin context for a resource being saved. This manifests when sub-resources are loaded as part of \Save Page As…\ functionality. For example a malicious page could recover a visitor’s Windows username and NTLM hash by including resources otherwise unreachable to the malicious page if they can convince the visitor to save the complete web page. Similarly SameSite cookies are sent on cross-origin requests when the \Save Page As…\ menu item is selected to save a page which can result in saving the wrong version of resources based on those cookies. This vulnerability affects Firefox 63.

CVSS Vector

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

Reference

http://www.securityfocus.com/bid/105721 http://www.securitytracker.com/id/1041944 https://bugzilla.mozilla.org/show_bug.cgi?id=1447087 https://bugzilla.mozilla.org/show_bug.cgi?id=1469916 https://usn.ubuntu.com/3801-1/ https://www.mozilla.org/security/advisories/mfsa2018-26/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

6.5