socket.c in GNU Screen through 4.9.0, when installed setuid or setgid (the default on platforms such as Arch Linux and FreeBSD), allows local users to send a privileged SIGHUP signal to any PID, causing a denial of service or disruption of the target process.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Screen | Gnu | * | 4.9.0 (including) |
| Screen | Ubuntu | bionic | * |
| Screen | Ubuntu | esm-infra-legacy/trusty | * |
| Screen | Ubuntu | esm-infra-legacy/xenial | * |
| Screen | Ubuntu | esm-infra/bionic | * |
| Screen | Ubuntu | esm-infra/xenial | * |
| Screen | Ubuntu | focal | * |
| Screen | Ubuntu | jammy | * |
| Screen | Ubuntu | kinetic | * |
| Screen | Ubuntu | lunar | * |
| Screen | Ubuntu | mantic | * |
| Screen | Ubuntu | trusty | * |
| Screen | Ubuntu | trusty/esm | * |
| Screen | Ubuntu | upstream | * |
| Screen | Ubuntu | xenial | * |
References
- https://git.savannah.gnu.org/cgit/screen.git/patch/?id=e9ad41bfedb4537a6f0de20f00b27c7739f168f7
- https://savannah.gnu.org/bugs/?63195
- https://www.exploit-db.com/exploits/51252
- https://git.savannah.gnu.org/cgit/screen.git/patch/?id=e9ad41bfedb4537a6f0de20f00b27c7739f168f7
- https://savannah.gnu.org/bugs/?63195
- https://security.netapp.com/advisory/ntap-20250509-0003/
- https://www.exploit-db.com/exploits/51252
- https://www.exploit-db.com/exploits/51252