| Name | CVE-2025-2817 |
| 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 affects Firefox < 138, Firefox ESR < 128.10, Firefox ESR < 115.23, Thunderbird < 138, and Thunderbird < 128.10. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| firefox (PTS) | sid | 138.0.1-1 | fixed |
| firefox-esr (PTS) | bullseye | 115.14.0esr-1~deb11u1 | fixed |
| bullseye (security) | 128.9.0esr-1~deb11u1 | fixed | |
| bookworm | 128.8.0esr-1~deb12u1 | fixed | |
| bookworm (security) | 128.10.0esr-1~deb12u1 | fixed | |
| trixie | 128.9.0esr-2 | fixed | |
| sid | 128.10.0esr-1 | fixed | |
| thunderbird (PTS) | bullseye | 1:115.12.0-1~deb11u1 | fixed |
| bullseye (security) | 1:128.10.0esr-1~deb11u1 | fixed | |
| bookworm | 1:128.8.0esr-1~deb12u1 | fixed | |
| bookworm (security) | 1:128.10.0esr-1~deb12u1 | fixed | |
| trixie | 1:128.9.0esr-1 | fixed | |
| sid | 1:128.10.0esr-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| firefox | source | (unstable) | (not affected) | |||
| firefox-esr | source | (unstable) | (not affected) | |||
| thunderbird | source | (unstable) | (not affected) |
- firefox <not-affected> (Only affects Firefox Updater on Windows)
- firefox-esr <not-affected> (Only affects Firefox ESR Updater on Windows)
- thunderbird <not-affected> (Only affects Thunderbird Updater on Windows)
https://www.mozilla.org/en-US/security/advisories/mfsa2025-28/#CVE-2025-2817
https://www.mozilla.org/en-US/security/advisories/mfsa2025-29/#CVE-2025-2817
https://www.mozilla.org/en-US/security/advisories/mfsa2025-32/#CVE-2025-2817