Auth bypass in Mozilla Firefox
CVE-2018-18505
An earlier fix for an Inter-process Communication (IPC) vulnerability, CVE-2011-3079, added authentication to communication between IPC endpoints and server parents during IPC process creation. This authentication is insufficient for channels created after the IPC process is started, leading to the authentication not being correctly applied to later channels. This could allow for a sandbox escape through IPC channels due to lack of message validation in the listener process. This vulnerability affects Thunderbird < 60.5, Firefox ESR < 60.5, and Firefox < 65.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.044 (91.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 91.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.045 · newest: 0.044 · change: -0.001
Affected products
- Mozilla Firefox — versions unspecified
- Mozilla Firefox Esr — versions unspecified
- Mozilla Thunderbird — versions unspecified
- Canonical Ubuntu Linux — versions 14.04, 16.04, 18.04
- Debian Linux — versions 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 7.6
- Red Hat Enterprise Linux Server Eus — versions 7.6
- Red Hat Enterprise Linux Server Tus — versions 7.6
Weakness classification (CWE)
References
- access.redhat.com/errata/RHSA-2019:0219 (vendor-advisory, Third Party Advisory)
- www.mozilla.org/security/advisories/mfsa2019-01/ (Vendor Advisory)
- usn.ubuntu.com/3897-1/ (vendor-advisory, Third Party Advisory)
- bugzilla.mozilla.org/show_bug.cgi (Patch, Issue Tracking, Vendor Advisory)
- www.securityfocus.com/bid/106781 (VDB Entry, Third Party Advisory, vdb-entry)
- security.gentoo.org/glsa/201903-04 (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/3874-1/ (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2019:0269 (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2019:0218 (vendor-advisory, Third Party Advisory)
- www.mozilla.org/security/advisories/mfsa2019-02/ (Vendor Advisory)
Frequently asked questions
- What is CVE-2018-18505?
- CVE-2018-18505 is a critical-severity vulnerability in Mozilla Firefox, classified under Improper Authentication. CVSS score: 10.0/10. Published 2019-02-05.
- How severe is CVE-2018-18505?
- Critical severity. CVSS v3 base score is 10.0 out of 10.