Vulnerability in Mozilla Firefox
CVE-2018-18506
When proxy auto-detection is enabled, if a web server serves a Proxy Auto-Configuration (PAC) file or if a PAC file is loaded locally, this PAC file can specify that requests to the localhost are to be sent through the proxy to another server. This behavior is disallowed by default when a proxy is manually configured, but when enabled could allow for attacks on services and tools that bind to the localhost for networked behavior if they are accessed through browsing. This vulnerability affects Firefox < 65.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.022 (81.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 81.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.022 · newest: 0.022 · change: +0.000
Affected products
- Mozilla Firefox — versions unspecified
- Canonical Ubuntu Linux — versions 14.04, 16.04, 18.04
- Debian Linux — versions 8.0, 9.0
- openSUSE Leap — versions 15.0, 42.3
- Red Hat Enterprise Linux — versions 8.0
- Red Hat Enterprise Linux Desktop — versions 6.0, 7.0
- Red Hat Enterprise Linux Eus — versions 8.1, 8.2, 8.4
- Red Hat Enterprise Linux Server — versions 6.0, 7.0
- Red Hat Enterprise Linux Server Aus — versions 7.6, 8.2, 8.4
- Red Hat Enterprise Linux Server Eus — versions 7.6
Public proof-of-concept exploits
References
- www.mozilla.org/security/advisories/mfsa2019-01/ (Vendor Advisory)
- www.securityfocus.com/bid/106773 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
- usn.ubuntu.com/3874-1/ (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2019:0623 (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2019:0622 (vendor-advisory, Third Party Advisory)
- seclists.org/bugtraq/2019/Mar/28 (mailing-list, Mailing List, Third Party Advisory)
- www.debian.org/security/2019/dsa-4411 (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2019/03/msg00024.html (mailing-list, Mailing List, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2019-03/msg00035.html (vendor-advisory, Mailing List, Third Party Advisory, Broken Link)
- access.redhat.com/errata/RHSA-2019:0680 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2018-18506?
- CVE-2018-18506 is a medium-severity vulnerability in Mozilla Firefox. CVSS score: 5.9/10. Published 2019-02-05.
- How severe is CVE-2018-18506?
- Medium severity. CVSS v3 base score is 5.9 out of 10.
- Is CVE-2018-18506 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.