Vulnerability · Published Apr 29, 2025 · Assigned by mozilla
CVE-2025-2817Privilege escalation in Thunderbird Updater
High 8.8
In plain English
A high-severity path traversal in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Thunderbird's update mechanism allowed a medium-integrity user process to interfere with the SYSTEM-level updater by manipulating the file-locking behavior. By injecting code into the user-privileged process, an attacker could bypass intended access controls, allowing SYSTEM-level file operations on paths controlled by a non-privileged user and enabling privilege escalation. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Firefox ESR 115.23, Thunderbird 138, and Thunderbird 128.10.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | firefox | 128.10.0-1.el10_0 | ALSA-2025:7506 |
| AlmaLinux:8 | firefox | 128.10.0-1.el8_10.alma.1 | ALSA-2025:4458 |
| AlmaLinux:9 | firefox | 128.10.0-1.el9_5.alma.1 | ALSA-2025:4443 |
| AlmaLinux:9 | firefox | 128.10.0-1.el9_6.alma.1 | ALSA-2025:7428 |
| AlmaLinux:9 | firefox-x11 | 128.10.0-1.el9_6.alma.1 | ALSA-2025:7428 |
| AlmaLinux:9 | firefox-x11 | 128.10.0-1.el9_5.alma.1 | ALSA-2025:4443 |
| AlmaLinux:10 | thunderbird | 128.10.0-1.el10_0.alma.1 | ALSA-2025:7507 |
| AlmaLinux:8 | thunderbird | 128.10.0-1.el8_10.alma.1 | ALSA-2025:4797 |
| AlmaLinux:9 | thunderbird | 128.10.0-1.el9_5.alma.1 | ALSA-2025:4460 |
| Rocky Linux:8 | firefox | 0:128.10.0-1.el8_10 | RLSA-2025:4458 |
| Rocky Linux:9 | firefox | 0:128.10.0-1.el9_5 | RLSA-2025:4443 |
| Rocky Linux:9 | firefox | 0:128.10.0-1.el9_5 | RLSA-2025:7428 |
| Rocky Linux:8 | thunderbird | 0:128.10.0-1.el8_10 | RLSA-2025:4797 |
| Rocky Linux:9 | thunderbird | 0:128.10.0-1.el9_5 | RLSA-2025:4460 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | see references |
| Mozilla | Thunderbird | see references |
Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1917536
- https://www.mozilla.org/security/advisories/mfsa2025-28/
- https://www.mozilla.org/security/advisories/mfsa2025-29/
- https://www.mozilla.org/security/advisories/mfsa2025-30/
- https://www.mozilla.org/security/advisories/mfsa2025-31/
- https://www.mozilla.org/security/advisories/mfsa2025-32/
- https://lists.debian.org/debian-lts-announce/2025/05/msg00022.html