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.
Weakness
The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Tinyproxy | Tinyproxy_project | * | 1.8.4 (including) |
| Tinyproxy | Ubuntu | artful | * |
| Tinyproxy | Ubuntu | bionic | * |
| Tinyproxy | Ubuntu | esm-apps/bionic | * |
| Tinyproxy | Ubuntu | esm-apps/xenial | * |
| Tinyproxy | Ubuntu | esm-infra-legacy/trusty | * |
| Tinyproxy | Ubuntu | trusty | * |
| Tinyproxy | Ubuntu | trusty/esm | * |
| Tinyproxy | Ubuntu | upstream | * |
| Tinyproxy | Ubuntu | xenial | * |
| Tinyproxy | Ubuntu | zesty | * |
Potential Mitigations
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/122.html
- https://cwe.mitre.org/data/definitions/233.html
- https://cwe.mitre.org/data/definitions/58.html