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.
EPSS: 0.022 (80.5th percentile) — read the EPSS interpretation.
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.
Affected products
- Mozilla Firefox — versions unspecified
- Canonical Ubuntu_linux — versions 14.04, 16.04, 18.04
- Debian Debian_linux — versions 8.0, 9.0
- Opensuse Leap — versions 15.0, 42.3
- Redhat Enterprise_linux — versions 8.0
- Redhat Enterprise_linux_desktop — versions 6.0, 7.0
- Redhat Enterprise_linux_eus — versions 8.1, 8.2, 8.4
- Redhat Enterprise_linux_server — versions 6.0, 7.0
- Redhat Enterprise_linux_server_aus — versions 7.6, 8.2, 8.4
- Redhat Enterprise_linux_server_eus — versions 7.6
Public proof-of-concept exploits
References
- security@mozilla.org (x_refsource_CONFIRM, Vendor Advisory)
- security@mozilla.org (VDB Entry, Third Party Advisory, vdb-entry, Broken Link, x_refsource_BID)
- security@mozilla.org (x_refsource_UBUNTU, vendor-advisory, Third Party Advisory)
- security@mozilla.org (x_refsource_REDHAT, vendor-advisory, Third Party Advisory)
- security@mozilla.org (x_refsource_REDHAT, vendor-advisory, Third Party Advisory)
- security@mozilla.org (mailing-list, x_refsource_BUGTRAQ, Mailing List, Third Party Advisory)
- security@mozilla.org (vendor-advisory, Third Party Advisory, x_refsource_DEBIAN)
- security@mozilla.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- security@mozilla.org (vendor-advisory, Mailing List, Third Party Advisory, Broken Link, x_refsource_SUSE)
- security@mozilla.org (x_refsource_REDHAT, 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.