Sicherheit: Pufferüberlauf in telnetd

Lesezeichen hinzufügen

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Caldera International, Inc. Security Advisory

Subject: Linux - Telnet AYT remote exploit
Advisory number: CSSA-2001-030.0
Issue date: 2001, August 10
Cross reference:
______________________________________________________________________________

1. Problem Description

Recently, a security problem was discovered in various BSD derived
implementations of the telnet daemon. Initially, it was thought that
the Linux netkit-telnet was not vulnerable to this problem. It turne
out that this was wrong.

On OpenLinux previous to version 3.1, this bug allows remote attackers
to gain root privilege.

Starting with OpenLinux 3.1, the telnet daemon is split into
two processes, a privileged one running the login session, and a
restricted one handling the network protocol where the bug occurs. As
a consequence, attempts to exploit this problem on OpenLinux 3.1 will
give an attacker a process running as user "nobody", and confined to
an empty chroot directory.

2. Vulnerable Versions

System Package
-----------------------------------------------------------
OpenLinux 2.3 All packages previous to
netkit-telnet-0.17-12a

OpenLinux eServer 2.3.1 All packages previous to
and OpenLinux eBuilder netkit-telnet-0.17-12a

OpenLinux eDesktop 2.4 All packages previous to
netkit-telnet-0.17-12a

OpenLinux Server 3.1 All packages previous to
netkit-telnet-0.17-12

OpenLinux Workstation 3.1 All packages previous to
netkit-telnet-0.17-12

3. Solution

Workaround

none

The proper solution is to upgrade to the latest packages.

4. OpenLinux 2.3

4.1 Location of Fixed Packages

The upgrade packages can be found on Caldera's FTP site at:

ftp://ftp.caldera.com/pub/updates/OpenLinux/2.3/current/RPMS

The corresponding source code package can be found at:

ftp://ftp.caldera.com/pub/updates/OpenLinux/2.3/current/SRPMS

4.2 Verification

70f6d9fd0083167b23c0f22043b5f72c RPMS/netkit-telnet-0.17-12a.i386.rpm
394490b87437bd04ca4aff661c4f5fff SRPMS/netkit-telnet-0.17-12a.src.rpm

4.3 Installing Fixed Packages

Upgrade the affected packages with the following commands:

rpm -Fvh netkit-telnet-0.17-12a.i386.rpm

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

82e95fe89d065e3116253701004de600 RPMS/netkit-telnet-0.17-12a.i386.rpm
394490b87437bd04ca4aff661c4f5fff SRPMS/netkit-telnet-0.17-12a.src.rpm

5.3 Installing Fixed Packages

Upgrade the affected packages with the following commands:

rpm -Fvh netkit-telnet-0.17-12a.i386.rpm

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

e35ae266e108a9494f8dd89f96e4b889 RPMS/netkit-telnet-0.17-12a.i386.rpm
394490b87437bd04ca4aff661c4f5fff SRPMS/netkit-telnet-0.17-12a.src.rpm

6.3 Installing Fixed Packages

Upgrade the affected packages with the following commands:

rpm -Fvh netkit-telnet-0.17-12a.i386.rpm

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

498c44cc801022653ee6c692a8633d74 RPMS/netkit-telnet-0.17-12.i386.rpm
ddd8cf299465d84d1044a13b8e340a23 SRPMS/netkit-telnet-0.17-12.src.rpm

7.3 Installing Fixed Packages

Upgrade the affected packages with the following commands:

rpm -Fvh netkit-telnet-0.17-12.i386.rpm

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:

SRPMS

8.2 Verification

498c44cc801022653ee6c692a8633d74 RPMS/netkit-telnet-0.17-12.i386.rpm
ddd8cf299465d84d1044a13b8e340a23 SRPMS/netkit-telnet-0.17-12.src.rpm

8.3 Installing Fixed Packages

Upgrade the affected packages with the following commands:

rpm -Fvh netkit-telnet-0.17-12.i386.rpm

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 10351.

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 OpenLinux.

11. Acknowledgements

Caldera wishes to thank Zen-Parse (zen-parse@gmx.net) for advance
notification of this bug and his cooperation.
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