cve-2023-28436
Vulnerability from cvelistv5
Published
2023-03-23 19:27
Modified
2025-02-25 14:50
Severity ?
5.7 (Medium) - CVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:C/C:H/I:N/A:N
EPSS score ?
0.16% (0.33476)
Summary
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
security-advisories@github.comhttps://github.com/tailscale/tailscale/commit/d00c046b723dff6e3775d7d35f891403ac21a47dPatch
security-advisories@github.comhttps://github.com/tailscale/tailscale/releases/tag/v1.38.2Patch, Release Notes
security-advisories@github.comhttps://github.com/tailscale/tailscale/security/advisories/GHSA-vfgq-g5x8-g595Mitigation, Vendor Advisory
security-advisories@github.comhttps://tailscale.com/security-bulletins/#ts-2023-003Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/tailscale/tailscale/commit/d00c046b723dff6e3775d7d35f891403ac21a47dPatch
af854a3a-2127-422b-91ae-364da2661108https://github.com/tailscale/tailscale/releases/tag/v1.38.2Patch, Release Notes
af854a3a-2127-422b-91ae-364da2661108https://github.com/tailscale/tailscale/security/advisories/GHSA-vfgq-g5x8-g595Mitigation, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://tailscale.com/security-bulletins/#ts-2023-003Vendor Advisory
Impacted products
Vendor Product Version
tailscale tailscale Version: >= 1.34.0, < 1.38.2
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