Sendbox bypass in Mozilla Firefox and Firefox ESR - CVE-2017-5456
Published: April 19, 2017
Vulnerability identifier: #VU6335
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2017-5456
CWE-ID: CWE-265
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Mozilla
Affected software:
Mozilla Firefox
Firefox ESR
Mozilla Firefox
Firefox ESR
Detailed vulnerability description
The vulnerability allows a remote attacker to read files from local filesystem.
The vulnerability exists due to an error in sendbox implementation. A remote attacker can bypass file system access protections in the sandbox using the file system request constructor through an IPC message.
Successful exploitation of the vulnerability may allow an attacker to read arbitrary files from the vulnerable system.
How to mitigate CVE-2017-5456
Update to Firefox 53 or Firefox ESR 52.1.