Security Update: [CSSA-2003-019.0] OpenLinux: tcp SYN with FIN packets are not discarded

[security@sco.com]

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To: bugtraq@securityfocus.com announce@lists.caldera.com security-alerts@linuxsecurity.com

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SCO Security Advisory

Subject: OpenLinux: tcp SYN with FIN packets are not discarded
Advisory number: CSSA-2003-019.0
Issue date: 2003 May 5
Cross reference:
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1. Problem Description

Allowing TCP packets with both the SYN and FIN bits set
significantly improve an attacker's chances of circumventing
a firewall.


2. Vulnerable Supported Versions

System Package
----------------------------------------------------------------------

OpenLinux 3.1.1 Server prior to tcp_sec-1.0-1.i386.rpm
OpenLinux 3.1.1 Workstation prior to tcp_sec-1.0-1.i386.rpm


3. Solution

The proper solution is to install the latest packages. Many
customers find it easier to use the Caldera System Updater, called
cupdate (or kcupdate under the KDE environment), to update these
packages rather than downloading and installing them by hand.


4. OpenLinux 3.1.1 Server

4.1 Package Location

ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Server/CSSA-2003-019.0/RPMS

4.2 Packages

57270040e72d49ac888b9967cc86cac8 tcp_sec-1.0-1.i386.rpm

4.3 Installation

- rpm -ivh tcp_sec-1.0-1.i386.rpm
- reboot the machine

4.4 Source Package Location

ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Server/CSSA-2003-019.0/SRPMS

4.5 Source Packages

acee43450be1a90b11bfc6049e9b788e tcp_sec-1.0-1.src.rpm


5. OpenLinux 3.1.1 Workstation

5.1 Package Location

ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Workstation/CSSA-2003-019.0/RPMS

5.2 Packages

24b4643542d6c0fbd6b8dc18462fb99e tcp_sec-1.0-1.i386.rpm

5.3 Installation

- rpm -ivh tcp_sec-1.0-1.i386.rpm
- reboot the machine

5.4 Source Package Location

ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Workstation/CSSA-2003-019.0/SRPMS

5.5 Source Packages

a20384e0690e90a6d0528dd3bb4b9843 tcp_sec-1.0-1.src.rpm

8. References

Specific references for this advisory:

http://www.securityfocus.com/archive/1/296122/2002-10-19/2002-10-25/2
http://www.kb.cert.org/vuls/id/464113

SCO security resources:

http://www.sco.com/support/security/index.html

This security fix closes SCO incidents sr876423, fz527624,
erg712275.


9. Disclaimer

SCO 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 SCO products.


10. Acknowledgements

Paul Starzetz discovered and researched this vulnerability.

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