Description
The add-on installation feature in Mozilla Firefox before 40.0.3 and Firefox ESR 38.x before 38.2.1 allows remote attackers to bypass an intended user-confirmation requirement by constructing a crafted data: URL and triggering navigation to an arbitrary http: or https: URL at a certain early point in the installation process.
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 8 | iceweasel | 38.2.1esr-1~deb8u1 | DSA-3345-1 |
| Debian 7 | iceweasel | 38.2.1esr-1~deb7u1 | DSA-3345-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | firefox | 40.0.3+build1-0ubuntu0.14.04.1 | USN-2723-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | firefox | 38.2.1-1.el7_1 | RHSA-2015:1693 |
| RHEL 6 | firefox | 38.2.1-1.el6_7 | RHSA-2015:1693 |
| RHEL 5 | firefox | 38.2.1-1.el5_11 | RHSA-2015:1693 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | MozillaFirefox | 38.2.1esr-45.1 | SUSE-SU-2015:1476-1 |
| SLES 12 | MozillaFirefox-branding-SLE | 31.0-14.1 | SUSE-SU-2015:1476-1 |
| SLES 12 | mozilla-nss | 3.19.2.0-26.2 | SUSE-SU-2015:1476-1 |
| SLES 11 SP2 | MozillaFirefox | 38.2.1esr-17.1 | SUSE-SU-2015:1504-1 |
| SLES 11 SP1 | MozillaFirefox | 38.2.1esr-17.1 | SUSE-SU-2015:1504-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 | MozillaFirefox | 38.2.1esr-45.1 | SUSE-SU-2015:1476-1 |
| SLES for SAP 12 | MozillaFirefox-branding-SLE | 31.0-14.1 | SUSE-SU-2015:1476-1 |
| SLES for SAP 12 | mozilla-nss | 3.19.2.0-26.2 | SUSE-SU-2015:1476-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 50.1.0-1.1 | openSUSE-SU-2024:10071-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | firefox | 38.2.1-1.0.1.el7_1 | ELSA-2015-1693 |
Advisories 8
- RHSA-2015:1693 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-2723-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3345-1 iceweasel - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2015:1476-1 Security update for MozillaFirefox, mozilla-nss 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
- SUSE-SU-2015:1504-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10071-1 MozillaFirefox-50.1.0-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- ELSA-2015-1693 Critical: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 27, 2015
References
- DSA-3345 vendor-advisory
- SUSE-SU-2015:2081 vendor-advisory
- USN-2723-1 vendor-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1042699
- 76505 vdb-entry
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- SUSE-SU-2015:1504 vendor-advisory
- 1033396 vdb-entry
- openSUSE-SU-2015:1492 vendor-advisory
- RHSA-2015:1693 vendor-advisory
- http://www.mozilla.org/security/announce/2015/mfsa2015-95.html