Headline

CVE-2023-28436: Release 1.38.2 · tailscale/tailscale

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.

1 year ago

CVE

Open in Source

#vulnerability #git #auth #ssh

- Actions
  
  Automate any workflow
- Packages
  
  Host and manage packages
- Security
  
  Find and fix vulnerabilities
- Codespaces
  
  Instant dev environments
- Copilot
  
  Write better code with AI
- Code review
  
  Manage code changes
- Issues
  
  Plan and track work
- Discussions
  
  Collaborate outside of code

*   Explore
*   All features
*   Documentation
*   GitHub Skills
*   Blog

- For
- Enterprise
- Teams
- Startups
- Education
- By Solution
- CI/CD & Automation
- DevOps
- DevSecOps
- Case Studies
- Customer Stories
- Resources
- GitHub Sponsors
  
  Fund open source developers

*   The ReadME Project
    
    GitHub community articles
    

*   Repositories
*   Topics
*   Trending
*   Collections

Pricing

A vulnerability identified in the implementation of Tailscale SSH in FreeBSD allowed commands to be run with a higher privilege group ID than that specified by Tailscale SSH access rules. **Affected platforms**: FreeBSD **Patched Tailscale client versions**: v1.38.2 or later ### What happened? 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. ### Who is affected? 9 tailnets with 22 FreeBSD nodes running Tailscale SSH since Tailscale v1.34 (released on 2022-12-04) may have had Tailscale SSH sessions with a higher privilege group ID than that specified in Tailscale SSH access rules. We have notified the affected organizations where we have [secu...

1 year ago

ghsa

Open in Source

#vulnerability #mac #git #ssh