Title: Webmin / Usermin Authentication Bypass Vulnerability
Severity: CRITICAL
Description:
Webmin is a web-based interface for system administration of Unix and Linux operating systems. Usermin is a related product designed for user level tasks.
It is possible to bypass authentication for a known user account in some versions of Webmin and Usermin. A remote attacker may gain access as any known username without requiring the password for that account.
Reportedly, both scripts communicate with another process during the authentication process. It is possible to include control characters in the authentication information passed between the processes. Under some circumstances, this ability allows an attacker to authenticate as any known username.
Webmin defines the user 'admin' with administrative privileges by default. This user has access to a command shell by default.
This vulnerability requires that the password timeout configuration option be set.
No further technical details are currently available.
Affected Products:
- Caldera OpenLinux Server 3.1.0
- Caldera OpenLinux Server 3.1.1
- Caldera OpenLinux Workstation 3.1.0
- Caldera OpenLinux Workstation 3.1.1
- Usermin Usermin 0.7.0
- Usermin Usermin 0.80.0
- Usermin Usermin 0.90.0
- Webmin Webmin 0.89.0
- Webmin Webmin 0.91.0
- Webmin Webmin 0.92.0
- Webmin Webmin 0.92.0 -1
- Webmin Webmin 0.93.0
- Webmin Webmin 0.94.0
- Webmin Webmin 0.950.0
- Webmin Webmin 0.960.0
References:
- Webmin: Webmin Homepage
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