HPI-VDB — Database for IT-Attack Analysis


ID: CVE-2023-28436

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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EPSS History

Current EPSS Score: 0.00042

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Reddit Posts: 2

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Github Repos

Github Repos: 0

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Exploits

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

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CWE-269

Condition Configuration
OR
OR
Alle Schwachstellen für tailscale
Date: March 31, 2023

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:*:*:*:*:*:*:*:*


Date: Nov. 7, 2023

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>