CVE-2023-34243: Windows user name disclosure in TGstation
TGstation is a toolset to manage production BYOND servers. In affected versions if a Windows user was registered in tgstation-server (TGS), an attacker could discover their username by brute-forcing the login endpoint with an invalid password. When a valid Windows logon was found, a distinct response would be generated. This issue has been addressed in version 5.12.5. Users are advised to upgrade. Users unable to upgrade may be mitigated by rate-limiting API calls with software that sits in front of TGS in the HTTP pipeline such as fail2ban.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
tgstation-server (TGS)to a version that resolves this vulnerability.Fixed in 5.12.5 - Compensating control
If unable to upgrade, apply rate-limiting to API calls to the TGS login endpoint using software in front of TGS in the HTTP pipeline such as fail2ban.
Event History
Frequently Asked Questions
What is the vulnerability ID for this vulnerability?
The vulnerability ID for this vulnerability is CVE-2023-34243.
What is the severity of CVE-2023-34243?
The severity of CVE-2023-34243 is medium with a severity value of 5.3.
What is TGstation?
TGstation is a toolset to manage production BYOND servers.
How can an attacker exploit CVE-2023-34243?
An attacker can exploit CVE-2023-34243 by brute-forcing the login endpoint with an invalid password to discover the username of a registered Windows user in tgstation-server.
How can I fix CVE-2023-34243?
To fix CVE-2023-34243, update tgstation-server to a version higher than 5.12.5.