CVE-2023-28436
Tailscale FreeBSD SSH Privilege Escalation Vulnerability
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.
INFO
Published Date :
March 23, 2023, 8:15 p.m.
Last Modified :
Nov. 21, 2024, 7:55 a.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update the affected packages.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2023-28436.
| URL | 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 |
| 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 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2023-28436 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2023-28436
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2023-28436 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2023-28436 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://github.com/tailscale/tailscale/commit/d00c046b723dff6e3775d7d35f891403ac21a47d Added Reference https://github.com/tailscale/tailscale/releases/tag/v1.38.2 Added Reference https://github.com/tailscale/tailscale/security/advisories/GHSA-vfgq-g5x8-g595 Added Reference https://tailscale.com/security-bulletins/#ts-2023-003 -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Changed 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. 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. -
Initial Analysis by [email protected]
Mar. 31, 2023
Action Type Old Value New Value Added CVSS V3.1 NIST AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://github.com/tailscale/tailscale/commit/d00c046b723dff6e3775d7d35f891403ac21a47d No Types Assigned https://github.com/tailscale/tailscale/commit/d00c046b723dff6e3775d7d35f891403ac21a47d Patch Changed Reference Type https://github.com/tailscale/tailscale/releases/tag/v1.38.2 No Types Assigned https://github.com/tailscale/tailscale/releases/tag/v1.38.2 Patch, Release Notes Changed Reference Type https://github.com/tailscale/tailscale/security/advisories/GHSA-vfgq-g5x8-g595 No Types Assigned https://github.com/tailscale/tailscale/security/advisories/GHSA-vfgq-g5x8-g595 Mitigation, Vendor Advisory Changed Reference Type https://tailscale.com/security-bulletins/#ts-2023-003 No Types Assigned https://tailscale.com/security-bulletins/#ts-2023-003 Vendor Advisory Added CPE Configuration OR *cpe:2.3:a:tailscale:tailscale:*:*:*:*:*:*:*:* versions from (including) 1.34 up to (excluding) 1.38.2
Vulnerability Scoring Details
Base CVSS Score: 8
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.06 }} -0.10%
score
0.18675
percentile