Vulnerability Details : CVE-2017-7834

A "data:" URL loaded in a new tab did not inherit the Content Security Policy (CSP) of the original page, allowing for bypasses of the policy including the execution of JavaScript. In prior versions when "data:" documents also inherited the context of the original page this would allow for potential cross-site scripting (XSS) attacks. This vulnerability affects Firefox < 57.

Vulnerability category: Cross site scripting (XSS)

Published 2018-06-11 21:29:12

Updated 2018-06-25 18:46:06

Source Mozilla Corporation

View at NVD, CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2017-7834

Probability of exploitation activity in the next 30 days: 0.22%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 60 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2017-7834

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Source
4.3	MEDIUM	AV:N/AC:M/Au:N/C:N/I:P/A:N	8.6	2.9	nvd@nist.gov
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: None Integrity Impact: Partial Availability Impact: None
6.1	MEDIUM	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N	2.8	2.7	nvd@nist.gov
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Changed Confidentiality: Low Integrity: Low Availability: None

CWE ids for CVE-2017-7834

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2017-7834

https://bugzilla.mozilla.org/show_bug.cgi?id=1358009

1358009 - (CVE-2017-7834) Content-Security-Policy Bypass with data: URL opened in a new tab
Issue Tracking;Permissions Required
http://www.securitytracker.com/id/1039803

Mozilla Firefox Multiple Bugs Let Remote Users Spoof URLs, Conduct Cross-Site Scripting Attacks, Bypass Security Controls, Obtain Potentially Sensitive Information, and Execute Arbitrary Code and Let
Third Party Advisory;VDB Entry

CVEs referencing this url
http://www.securityfocus.com/bid/101832

Mozilla Firefox Prior to 57 Multiple Security Vulnerabilities
Third Party Advisory;VDB Entry

CVEs referencing this url
https://www.mozilla.org/security/advisories/mfsa2017-24/

Security vulnerabilities fixed in Firefox 57 — Mozilla
Vendor Advisory

CVEs referencing this url

Products affected by CVE-2017-7834

Mozilla » Firefox
Versions up to, including, (<=) 56.0.2
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
Matching versions