CSP policy bypass in Mozilla Firefox - CVE-2017-7834
Published: November 15, 2017
Vulnerability identifier: #VU9321
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2017-7834
CWE-ID: CWE-264
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass certain security restrictions.
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.
Affected software
Mozilla Firefox
Arch Linux
Ubuntu
Arch Linux
Ubuntu
How to mitigate CVE-2017-7834
Update to version Firefox 57.