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.
Published 2018-06-11 21:29:16
Updated 2019-10-03 00:03:26
View at NVD,   CVE.org

Products affected by CVE-2018-5163

Exploit prediction scoring system (EPSS) score for CVE-2018-5163

2.54%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 85 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2018-5163

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
5.1
MEDIUM AV:N/AC:H/Au:N/C:P/I:P/A:P
4.9
6.4
NIST
8.1
HIGH CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
2.2
5.9
NIST

CWE ids for CVE-2018-5163

  • The product does not preserve permissions or incorrectly preserves permissions when copying, restoring, or sharing objects, which can cause them to have less restrictive permissions than intended.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2018-5163

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