Description
Heap-based buffer overflow in the nsTransformedTextRun function in Mozilla Firefox before 33.0, Firefox ESR 31.x before 31.2, and Thunderbird 31.x before 31.2 allows remote attackers to execute arbitrary code via Cascading Style Sheets (CSS) token sequences that trigger changes to capitalization style.
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 7 | icedove | 31.2.0-1~deb7u1 | DSA-3061-1 |
| Debian 7 | iceweasel | 31.2.0esr-2~deb7u1 | DSA-3050-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | firefox | 33.0+build2-0ubuntu0.14.04.1 | USN-2372-1 |
| Ubuntu 14.04 LTS | thunderbird | 1:31.2.0+build2-0ubuntu0.14.04.1 | USN-2373-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | firefox | 31.2.0-3.el7_0 | RHSA-2014:1635 |
| RHEL 7 | xulrunner +1 | 31.2.0-1.el7_0 | RHSA-2014:1635 |
| RHEL 6 | firefox | 31.2.0-3.el6_6 | RHSA-2014:1635 |
| RHEL 5 | firefox | 31.2.0-3.el5_11 | RHSA-2014:1635 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 50.1.0-1.1 | openSUSE-SU-2024:10071-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 45.5.1-1.1 | openSUSE-SU-2024:10230-1 |
| 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 | 31.2.0-3.0.1.el7_0 | ELSA-2014-1635 |
| Oracle Linux 7 | xulrunner +1 | 31.2.0-1.0.1.el7_0 | ELSA-2014-1635 |
Advisories 9
- RHSA-2014:1635 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- USN-2373-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-2372-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3061-1 icedove - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3050-1 iceweasel - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10230-1 MozillaThunderbird-45.5.1-1.1 on GA media 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
- openSUSE-SU-2024:10071-1 MozillaFirefox-50.1.0-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- ELSA-2014-1635 Critical: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 15, 2014
References
- 62021 third-party-advisory
- openSUSE-SU-2015:0138 vendor-advisory
- openSUSE-SU-2014:1344 vendor-advisory
- openSUSE-SU-2014:1346 vendor-advisory
- FEDORA-2014-13042 vendor-advisory
- 1031028 vdb-entry
- openSUSE-SU-2014:1345 vendor-advisory
- http://www.mozilla.org/security/announce/2014/mfsa2014-75.html
- USN-2373-1 vendor-advisory
- https://advisories.mageia.org/MGASA-2014-0421.html
- GLSA-201504-01 vendor-advisory
- RHSA-2014:1635 vendor-advisory
- FEDORA-2014-14084 vendor-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1041512
- 61387 third-party-advisory
- USN-2372-1 vendor-advisory
- http://www.oracle.com/technetwork/topics/security/bulletinapr2015-2511959.html
- 62022 third-party-advisory
- openSUSE-SU-2015:1266 vendor-advisory
- 1031030 vdb-entry
- 62023 third-party-advisory
- openSUSE-SU-2014:1343 vendor-advisory
- DSA-3050 vendor-advisory
- 61854 third-party-advisory
- DSA-3061 vendor-advisory
- 70430 vdb-entry