Vulnerability Details : CVE-2018-5143
URLs using "javascript:" have the protocol removed when pasted into the addressbar to protect users from cross-site scripting (XSS) attacks, but if a tab character is embedded in the "javascript:" URL the protocol is not removed and the script will execute. This could allow users to be socially engineered to run an XSS attack against themselves. This vulnerability affects Firefox < 59.
Vulnerability category: Cross site scripting (XSS)
Products affected by CVE-2018-5143
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2018-5143
0.22%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 59 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2018-5143
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:N/I:P/A:N |
8.6
|
2.9
|
NIST | |
|
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
|
NIST |
CWE ids for CVE-2018-5143
-
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-2018-5143
-
https://usn.ubuntu.com/3596-1/
USN-3596-1: Firefox vulnerabilities | Ubuntu security noticesThird Party Advisory
-
https://bugzilla.mozilla.org/show_bug.cgi?id=1422643
1422643 - (CVE-2018-5143) Self-XSS protection bypass with tab charactersIssue Tracking;Vendor Advisory
-
http://www.securitytracker.com/id/1040514
Mozilla Firefox Multiple Bugs Let Remote Users Spoof URLs, Bypass Security Restrictions, Deny Service, Obtain Potentially Sensitive Information, and Execute Arbitrary Code - SecurityTrackerThird Party Advisory;VDB Entry
-
https://www.mozilla.org/security/advisories/mfsa2018-06/
Security vulnerabilities fixed in Firefox 59 — MozillaVendor Advisory
-
http://www.securityfocus.com/bid/103386
Mozilla Firefox MFSA2018-06 Multiple Security VulnerabilitiesThird Party Advisory;VDB Entry
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