XSS in Mozilla Firefox
CVE-2017-7823
The content security policy (CSP) "sandbox" directive did not create a unique origin for the document, causing it to behave as if the "allow-same-origin" keyword were always specified. This could allow a Cross-Site Scripting (XSS) attack to be launched from unsafe content. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.015 (72.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 72.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000
Affected products
- Mozilla Firefox — versions unspecified
- Mozilla Firefox Esr — versions unspecified
- Mozilla Thunderbird — versions unspecified
- Debian Linux — versions 7.0, 8.0, 9.0
- Red Hat Enterprise Linux Desktop — versions 6.0, 7.0
- Red Hat Enterprise Linux Server — versions 6.0, 7.0
- Red Hat Enterprise Linux Server Aus — versions 7.4
- Red Hat Enterprise Linux Server Eus — versions 7.4, 7.5
- Red Hat Enterprise Linux Workstation — versions 6.0, 7.0
Weakness classification (CWE)
References
- bugzilla.mozilla.org/show_bug.cgi (Exploit, Patch, Issue Tracking)
- www.securityfocus.com/bid/101059 (VDB Entry, Third Party Advisory, vdb-entry)
- lists.debian.org/debian-lts-announce/2017/11/msg00000.html (mailing-list, Mailing List, Third Party Advisory)
- www.mozilla.org/security/advisories/mfsa2017-22/ (Vendor Advisory)
- www.securitytracker.com/id/1039465 (VDB Entry, Third Party Advisory, vdb-entry)
- access.redhat.com/errata/RHSA-2017:2831 (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2017:2885 (vendor-advisory, Third Party Advisory)
- www.mozilla.org/security/advisories/mfsa2017-21/ (Vendor Advisory)
- www.debian.org/security/2017/dsa-4014 (vendor-advisory, Third Party Advisory)
- www.mozilla.org/security/advisories/mfsa2017-23/ (Vendor Advisory)
Frequently asked questions
- What is CVE-2017-7823?
- CVE-2017-7823 is a medium-severity vulnerability in Mozilla Firefox, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2018-06-11.
- How severe is CVE-2017-7823?
- Medium severity. CVSS v3 base score is 5.4 out of 10.