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.
References
Link | Resource |
---|---|
https://github.com/tailscale/tailscale/commit/d00c046b723dff6e3775d7d35f891403ac21a47d | Patch |
https://github.com/tailscale/tailscale/releases/tag/v1.38.2 | Patch Release Notes |
https://github.com/tailscale/tailscale/security/advisories/GHSA-vfgq-g5x8-g595 | Mitigation Vendor Advisory |
https://tailscale.com/security-bulletins/#ts-2023-003 | Vendor Advisory |
History
No history.
MITRE Information
Status: PUBLISHED
Assigner: GitHub_M
Published: 2023-03-23T19:27:48.051Z
Updated: 2023-03-23T19:27:48.051Z
Reserved: 2023-03-15T15:59:10.053Z
Link: CVE-2023-28436
JSON object: View
NVD Information
Status : Modified
Published: 2023-03-23T20:15:15.487
Modified: 2023-11-07T04:10:36.033
Link: CVE-2023-28436
JSON object: View
Redhat Information
No data.
CWE