CVE-2018-18506
MEDIUMCVSS 5.9/10EPSS 2.18%
Last modified
CVE-2018-18506 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. 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. EPSS estimates a 2.18% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 65.0 |
| Canonical | Ubuntu Linux | 14.04 |
| Canonical | Ubuntu Linux | 16.04 |
| Canonical | Ubuntu Linux | 18.04 |
| Canonical | Ubuntu Linux | 18.10 |
| Debian | Debian Linux | 8.0 |
| Debian | Debian Linux | 9.0 |
| Redhat | Enterprise Linux | 8.0 |
| Redhat | Enterprise Linux Desktop | 6.0 |
| Redhat | Enterprise Linux Desktop | 7.0 |
| Redhat | Enterprise Linux Eus | 8.1 |
| Redhat | Enterprise Linux Eus | 8.2 |
| Redhat | Enterprise Linux Eus | 8.4 |
| Redhat | Enterprise Linux Eus | 8.6 |
| Redhat | Enterprise Linux Server | 6.0 |
| Redhat | Enterprise Linux Server | 7.0 |
| Redhat | Enterprise Linux Server Aus | 7.6 |
| Redhat | Enterprise Linux Server Aus | 8.2 |
| Redhat | Enterprise Linux Server Aus | 8.4 |
| Redhat | Enterprise Linux Server Aus | 8.6 |
| Redhat | Enterprise Linux Server Eus | 7.6 |
| Redhat | Enterprise Linux Server Tus | 7.6 |
| Redhat | Enterprise Linux Server Tus | 8.2 |
| Redhat | Enterprise Linux Server Tus | 8.4 |
| Redhat | Enterprise Linux Server Tus | 8.6 |
| Redhat | Enterprise Linux Workstation | 6.0 |
| Redhat | Enterprise Linux Workstation | 7.0 |
| Opensuse | Leap | 15.0 |
| Opensuse | Leap | 42.3 |
References
- http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00035.htmlBroken Link, Mailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00043.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00023.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00043.htmlMailing List, Third Party Advisory
- http://www.securityfocus.com/bid/106773Broken Link, Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2019:0622Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0623Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0680Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0681Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0966Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1144Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/03/msg00024.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/04/msg00000.htmlMailing List, Third Party Advisory
- https://seclists.org/bugtraq/2019/Apr/0Mailing List, Third Party Advisory
- https://seclists.org/bugtraq/2019/Mar/28Mailing List, Third Party Advisory
- https://security.gentoo.org/glsa/201904-07Third Party Advisory
- https://usn.ubuntu.com/3874-1/Third Party Advisory
- https://usn.ubuntu.com/3927-1/Third Party Advisory
- https://www.debian.org/security/2019/dsa-4411Third Party Advisory
- https://www.debian.org/security/2019/dsa-4420Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-01/Vendor Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00035.htmlBroken Link, Mailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00043.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00023.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00043.htmlMailing List, Third Party Advisory
- http://www.securityfocus.com/bid/106773Broken Link, Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2019:0622Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0623Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0680Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0681Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0966Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1144Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/03/msg00024.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/04/msg00000.htmlMailing List, Third Party Advisory
- https://seclists.org/bugtraq/2019/Apr/0Mailing List, Third Party Advisory
- https://seclists.org/bugtraq/2019/Mar/28Mailing List, Third Party Advisory
- https://security.gentoo.org/glsa/201904-07Third Party Advisory
- https://usn.ubuntu.com/3874-1/Third Party Advisory
- https://usn.ubuntu.com/3927-1/Third Party Advisory
- https://www.debian.org/security/2019/dsa-4411Third Party Advisory
- https://www.debian.org/security/2019/dsa-4420Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-01/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2018-18506?
CVE-2018-18506 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 2.18% probability of exploitation in the next 30 days.
How do I fix CVE-2018-18506?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2018-18506?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST