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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 65 | 65 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | firefox-esr | 60.6.0esr-1 | — |
| Debian 14 | thunderbird | 1:60.6.1-1 | — |
| Debian 13 | firefox-esr | 60.6.0esr-1 | — |
| Debian 13 | thunderbird | 1:60.6.1-1 | — |
| Debian 12 | firefox-esr | 60.6.0esr-1 | — |
| Debian 12 | thunderbird | 1:60.6.1-1 | — |
| Debian 9 | firefox-esr | 60.6.0esr-1~deb9u1 | DSA-4411-1 |
| Debian 9 | thunderbird | 1:60.6.1-1~deb9u1 | DSA-4420-1 |
| Debian 8 | firefox-esr | 60.6.0esr-1~deb8u1 | DLA-1722-1 |
| Debian 8 | thunderbird | 1:60.6.1-1~deb8u1 | DLA-1743-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | mozjs52 | No fix yet | — |
| Ubuntu 18.04 LTS | firefox | 65.0+build2-0ubuntu0.18.04.1 | USN-3874-1 |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | thunderbird | 1:60.6.1+build2-0ubuntu0.18.04.1 | USN-3927-1 |
| Ubuntu 16.04 LTS | firefox | 65.0+build2-0ubuntu0.16.04.1 | USN-3874-1 |
| Ubuntu 16.04 LTS | thunderbird | 1:60.6.1+build2-0ubuntu0.16.04.1 | USN-3927-1 |
| Ubuntu 14.04 LTS | firefox | 65.0+build2-0ubuntu0.14.04.1 | USN-3874-1 |
| Ubuntu 14.04 LTS | thunderbird | 1:60.6.1+build2-0ubuntu0.14.04.1 | USN-3927-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | firefox +1 | 60.6.1-1.el8 | RHSA-2019:1144, RHSA-2019:0966 |
| RHEL 7 | firefox | 60.6.0-3.el7_6 | RHSA-2019:0622 |
| RHEL 7 | thunderbird | 60.6.1-1.el7_6 | RHSA-2019:0681 |
| RHEL 6 | firefox | 60.6.0-3.el6_10 | RHSA-2019:0623 |
| RHEL 6 | thunderbird | 60.6.1-1.el6_10 | RHSA-2019:0680 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | MozillaFirefox | 60.6.1-3.29.3 | SUSE-SU-2019:0871-1 |
| SLES 15 | MozillaThunderbird | 60.6.1-3.28.1 | SUSE-SU-2019:0853-1 |
| SLES 12 SP4 | MozillaFirefox | 60.6.1esr-109.63.2 | SUSE-SU-2019:0852-1 |
| SLES 12 SP3 | MozillaFirefox | 60.6.1esr-109.63.2 | SUSE-SU-2019:0852-1 |
| SLES 12 SP2 | MozillaFirefox | 60.6.1esr-109.63.2 | SUSE-SU-2019:0852-1 |
| SLES 12 SP1 | MozillaFirefox | 60.6.1esr-109.63.2 | SUSE-SU-2019:0852-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | MozillaFirefox | 60.6.1esr-109.63.2 | SUSE-SU-2019:0852-1 |
| SLES for SAP 12 SP4 | MozillaFirefox | 60.6.1esr-109.63.2 | SUSE-SU-2019:0852-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 60.6.1esr-109.63.2 | SUSE-SU-2019:0852-1 |
| SLES for SAP 12 SP2 | MozillaFirefox | 60.6.1esr-109.63.2 | SUSE-SU-2019:0852-1 |
| SLES for SAP 12 SP1 | MozillaFirefox | 60.6.1esr-109.63.2 | SUSE-SU-2019:0852-1 |
| SUSE Package Hub 12 | MozillaThunderbird | 60.6.1-82.1 | openSUSE-SU-2019:1126-1 |
| SUSE OpenStack Cloud 7 | MozillaFirefox | 60.6.1esr-109.63.2 | SUSE-SU-2019:0852-1 |
| SUSE Enterprise Storage 4 | MozillaFirefox | 60.6.1esr-109.63.2 | SUSE-SU-2019:0852-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 92.0-1.2 | openSUSE-SU-2024:10600-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Leap 15.0 | MozillaFirefox | 60.6.1-lp150.3.45.1 | openSUSE-SU-2019:1077-1 |
| openSUSE Leap 15.0 | MozillaThunderbird | 60.6.1-lp150.3.37.1 | openSUSE-SU-2019:1162-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.23 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.22 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.21 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.20 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.19 | firefox-esr | 60.6.1-r0 | — |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.18 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.17 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.16 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.15 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.14 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.13 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.12 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.11 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.10 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.9 | firefox-esr | 60.6.1-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 60.6.1-1.amzn2.0.1 | ALAS2-2019-1195 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | firefox | 60.6.1-1.0.2.el8 | ELSA-2019-0966 |
| Oracle Linux 8 | thunderbird | 60.6.1-1.0.1.el8 | ELSA-2019-1144 |
| Oracle Linux 7 | firefox | 60.6.0-3.0.1.el7_6 | ELSA-2019-0622 |
| Oracle Linux 7 | thunderbird | 60.6.1-1.0.1.el7_6 | ELSA-2019-0681 |
Advisories 25
- RHSA-2019:1144 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2019:0680 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2019:0681 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2019:0966 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2019:0623 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2019:0622 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- USN-3927-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3874-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4420-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4411-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1722-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1743-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2019:0853-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1162-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10600-1 MozillaFirefox-92.0-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1126-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0871-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0852-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1077-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14572-1 firefox-esr-128.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2019-1144 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 30, 2019
- ELSA-2019-0966 Critical: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 30, 2019
- ALAS2-2019-1195 Critical: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Apr 26, 2019
- ELSA-2019-0681 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 28, 2019
- ELSA-2019-0622 Critical: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 20, 2019
References
- https://www.mozilla.org/security/advisories/mfsa2019-01/
- 106773 vdb-entry
- USN-3874-1 vendor-advisory
- RHSA-2019:0623 vendor-advisory
- RHSA-2019:0622 vendor-advisory
- 20190320 [SECURITY] [DSA 4411-1] firefox-esr security update mailing-list
- DSA-4411 vendor-advisory
- [debian-lts-announce] 20190321 [SECURITY] [DLA 1722-1] firefox-esr security update mailing-list
- openSUSE-SU-2019:1056 vendor-advisory
- RHSA-2019:0680 vendor-advisory
- RHSA-2019:0681 vendor-advisory
- USN-3927-1 vendor-advisory
- openSUSE-SU-2019:1077 vendor-advisory
- DSA-4420 vendor-advisory
- 20190401 [SECURITY] [DSA 4420-1] thunderbird security update mailing-list
- [debian-lts-announce] 20190401 [SECURITY] [DLA 1743-1] thunderbird security update mailing-list
- GLSA-201904-07 vendor-advisory
- openSUSE-SU-2019:1126 vendor-advisory
- openSUSE-SU-2019:1162 vendor-advisory
- RHSA-2019:0966 vendor-advisory
- RHSA-2019:1144 vendor-advisory