Description
main.c in Tinyproxy 1.8.4 and earlier creates a /run/tinyproxy/tinyproxy.pid file after dropping privileges to a non-root account, which might allow local users to kill arbitrary processes by leveraging access to this non-root account for tinyproxy.pid modification before a root script executes a "kill `cat /run/tinyproxy/tinyproxy.pid`" command.
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 | tinyproxy | 1.10.0-1 | — |
| Debian 13 | tinyproxy | 1.10.0-1 | — |
| Debian 12 | tinyproxy | 1.10.0-1 | — |
| Debian 8 | tinyproxy | 1.8.3-3+deb8u1 | DLA-2163-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | tinyproxy | 1.8.4-5ubuntu0.1~esm1 | USN-4808-1 |
| Ubuntu Pro 16.04 LTS | tinyproxy | 1.8.3-3ubuntu16.04.1~esm1 | USN-4808-1 |
| Ubuntu Pro 14.04 LTS | tinyproxy | 1.8.3-3ubuntu14.04.1~esm1 | USN-4808-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 15 SP5 | tinyproxy | 1.11.2-bp155.3.3.1 | openSUSE-SU-2024:0119-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | tinyproxy | 1.11.0-1.3 | openSUSE-SU-2024:11465-1 |
| openSUSE Leap 15.5 | tinyproxy | 1.11.2-bp155.3.3.1 | openSUSE-SU-2024:0119-1 |
Advisories 4
- USN-4808-1 tinyproxy vulnerability Ubuntu Security Notices (USN) · Jun 29, 2026
- DLA-2163-1 tinyproxy - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:11465-1 tinyproxy-1.11.0-1.3 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:0119-1 Security update for tinyproxy SUSE / openSUSE Security Updates · Feb 4, 2026