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Caldera International, Inc. Security Advisory
Subject: Linux - webmin root account leak
Advisory number: CSSA-2001-019.1
Issue date: 2001 May, 29
Last change: 2001 July, 2
Cross reference:
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1. Problem Description
When starting system daemons from the webmin webfrontend, webmin
does not clear its environment variables. Since these variables
contain the authorization of the administrator, any daemon gets
these variables.
A simple attack would be to write a CGI scripts which just dumps
all environment variables and wait for the administrator to restart
apache using webmin.
There is also a environment variable leakage in cron script creation,
and a file viewing vulnerability, which makes an upgrade necessary.
This additional CSSA releases fixed packages for the OpenLinux
3.1 series of products.
2. Vulnerable Versions
System Package
-----------------------------------------------------------
OpenLinux 2.3 not vulnerable
OpenLinux eServer 2.3.1 All packages previous to
and OpenLinux eBuilder webmin-0.749-7
OpenLinux eDesktop 2.4 All packages previous to
webmin-0.78-11
OpenLinux 3.1 Server All packages previous to
webmin-0.87-2
OpenLinux 3.1 Workstation All packages previous to
webmin-0.87-2
3. Solution
Workaround
none
The proper solution is to upgrade to the latest packages.
4. OpenLinux 2.3
not vulnerable
5. OpenLinux eServer 2.3.1 and OpenLinux eBuilder for ECential 3.0
5.1 Location of Fixed Packages
The upgrade packages can be found on Caldera's FTP site at:
ftp://ftp.caldera.com/pub/updates/eServer/2.3/current/RPMS/
The corresponding source code package can be found at:
ftp://ftp.caldera.com/pub/updates/eServer/2.3/current/SRPMS
5.2 Verification
8b978c8a6a6bf56da5f3eb56a2768e6b RPMS/webmin-0.749-7.i386.rpm
dad6505cde59262187828d9d2b6fe0e7 SRPMS/webmin-0.749-7.src.rpm
5.3 Installing Fixed Packages
Upgrade the affected packages with the following commands:
/etc/rc.d/init.d/webmin stop
rpm -Fvh webmin*i386.rpm
/etc/rc.d/init.d/webmin start
6. OpenLinux eDesktop 2.4
6.1 Location of Fixed Packages
The upgrade packages can be found on Caldera's FTP site at:
ftp://ftp.caldera.com/pub/updates/eDesktop/2.4/current/RPMS/
The corresponding source code package can be found at:
ftp://ftp.caldera.com/pub/updates/eDesktop/2.4/current/SRPMS
6.2 Verification
cd03a53b35407547b5f4b339fcb60fda RPMS/webmin-0.78-11.i386.rpm
13d2b8d05eb94f7b501c231e33b06e8d SRPMS/webmin-0.78-11.src.rpm
6.3 Installing Fixed Packages
Upgrade the affected packages with the following commands:
/etc/rc.d/init.d/webmin stop
rpm -Fvh webmin*i386.rpm
/etc/rc.d/init.d/webmin start
7. OpenLinux 3.1 Server
7.1 Location of Fixed Packages
The upgrade packages can be found on Caldera's FTP site at:
ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1/Server/current/RPMS/
The corresponding source code package can be found at:
ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1/Server/current/SRPMS
7.2 Verification
10e9f27eb7e61d9d89880d8136500264 RPMS/webmin-0.87-2.i386.rpm
5d99e6b87e9c3d58cca778ecd25a5a03 SRPMS/webmin-0.87-2.src.rpm
7.3 Installing Fixed Packages
Upgrade the affected packages with the following commands:
/etc/rc.d/init.d/webmin stop
rpm -Fvh webmin*i386.rpm
/etc/rc.d/init.d/webmin start
or start kcupdate, the Caldera OpenLinux Update Manager.
8. OpenLinux 3.1 Workstation
8.1 Location of Fixed Packages
The upgrade packages can be found on Caldera's FTP site at:
ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1/Workstation/current/RPMS/
The corresponding source code package can be found at:
ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1/Workstation/current/SRPMS
8.2 Verification
10e9f27eb7e61d9d89880d8136500264 RPMS/webmin-0.87-2.i386.rpm
5d99e6b87e9c3d58cca778ecd25a5a03 SRPMS/webmin-0.87-2.src.rpm
8.3 Installing Fixed Packages
Upgrade the affected packages with the following commands:
/etc/rc.d/init.d/webmin stop
rpm -Fvh webmin*i386.rpm
/etc/rc.d/init.d/webmin start
or start kcupdate, the Caldera OpenLinux Update Manager.
9. References
This and other Caldera security resources are located at:
http://www.caldera.com/support/security/index.html
This security fix closes Caldera's internal Problem Report 10039.
10.Disclaimer
Caldera International, Inc. is not responsible for the misuse of
any of the information we provide on this website and/or through our
security advisories. Our advisories are a service to our customers
intended to promote secure installation and use of Caldera International
products.
11.Acknowledgements:
Caldera International wants to thank J. Nick Koston for reporting
the problem and Jamie Cameron for providing a timely fix.
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