CVE-2023-28436
Summary
| CVE | CVE-2023-28436 |
|---|---|
| State | PUBLIC |
| Assigner | [email protected] |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2023-03-23 20:15:00 UTC |
| Updated | 2023-11-07 04:10:00 UTC |
| Description | Tailscale is software for using Wireguard and multi-factor authentication (MFA). A vulnerability identified in the implementation of Tailscale SSH starting in version 1.34.0 and prior to prior to 1.38.2 in FreeBSD allows commands to be run with a higher privilege group ID than that specified in Tailscale SSH access rules. A difference in the behavior of the FreeBSD `setgroups` system call from POSIX meant that the Tailscale client running on a FreeBSD-based operating system did not appropriately restrict groups on the host when using Tailscale SSH. When accessing a FreeBSD host over Tailscale SSH, the egid of the tailscaled process was used instead of that of the user specified in Tailscale SSH access rules. Tailscale SSH commands may have been run with a higher privilege group ID than that specified in Tailscale SSH access rules if they met all of the following criteria: the destination node was a FreeBSD device with Tailscale SSH enabled; Tailscale SSH access rules permitted access for non-root users; and a non-interactive SSH session was used. Affected users should upgrade to version 1.38.2 to remediate the issue. |
Risk And Classification
Problem Types: CWE-269
NVD Known Affected Configurations (CPE 2.3)
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| Release 1.38.2 · tailscale/tailscale · GitHub | MISC | github.com | |
| Non-interactive Tailscale SSH sessions on FreeBSD may use the effective group ID of the tailscaled process · Advisory · tailscale/tailscale · GitHub | MISC | github.com | |
| ssh/tailssh: fix privilege dropping on FreeBSD; add tests · tailscale/tailscale@d00c046 · GitHub | MISC | github.com | |
| Security Bulletins · Tailscale | MISC | tailscale.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Legacy QID Mappings
- 691096 Free Berkeley Software Distribution (FreeBSD) Security Update for tailscale (1b15a554-c981-11ed-bb39-901b0e9408dc)