If a malicious attacker has used another vulnerability to gain full control over a content process, they may be able to replace the alternate data resources stored in the JavaScript Start-up Bytecode Cache (JSBC) for other JavaScript code. If the parent process then runs this replaced code, the executed script would be run with the parent process' privileges, escaping the sandbox on content processes. This vulnerability affects Firefox < 60.



Source: MITRE

Published: 2018-06-11

Modified: 2018-08-03

Type: CWE-264

Risk Information

CVSS v2.0

Base Score: 5.1

Vector: (AV:N/AC:H/Au:N/C:P/I:P/A:P)

Impact Score: 6.4

Exploitability Score: 4.9

Severity: MEDIUM

CVSS v3.0

Base Score: 8.1

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

Impact Score: 5.9

Exploitability Score: 2.2

Severity: HIGH