Last Modified: Nov. 7, 2023
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.
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Found exploits:
Attack Vector: Adjacent
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High
Base Score: 8.0
Exploitability Score:
2.1
Impact Score: 5.9
CVSS V3: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-269
Condition | Configuration | |
---|---|---|
OR | ||
OR | ||
cpe:2.3:a:tailscale:tailscale:*:*:*:*:*:*:*:* Part: a Vendor: tailscale | Alle Schwachstellen für tailscale |
Base Score V3:
Not defined
Exploitability Score V3:
Not defined
Impact Score V3:
Not defined
Cvss Vector V3:
Not defined
Configuration:
added:
cpe:2.3:a:tailscale:tailscale:*:*:*:*:*:*:*:*
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.
<?xml version="1.0" ?> <set operator="and"> <set operator="or"> <prop key="application" value="cpe:2.3:a:tailscale:tailscale:*:*:*:*:*:*:*:*"/> </set> </set>
<?xml version="1.0" ?> <set operator="and"> <set operator="or"> <prop key="application" value="cpe:2.3:a:tailscale:tailscale:*:*:*:*:*:*:*:*"/> </set> <prop key="program_influence" value="input"/> </set>