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SCO Security Advisory

Subject: OpenServer 5.0.5 : Insecure creation of files in /tmp
Advisory number: CSSA-2003-SCO.27
Issue date: 2003 October 20
Cross reference: sr865679 fz521201 erg712072 CAN-2003-0872
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1. Problem Description

Several scripts use files /tmp in a insecure way. These
filenames can be symlinked to by a malicious user, and cause
various nefarious things to happen.

OpenServer 5.0.6 has previously fixed all these scripts,
hence this issue does not affect OpenServer 5.0.6 or 5.0.7.

The Common Vulnerabilities and Exposures (CVE) project has assigned
the name CAN-2003-0872 to this issue. This is a candidate for
inclusion in the CVE list (http://cve.mitre.org), which standardizes
names for security problems. Candidates may change significantly
before they become official CVE entries.

2. Vulnerable Supported Versions

System Binaries
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OpenServer 5.0.5 /etc/init.d/VDISK
/etc/init.d/VDRESTORE
/etc/tcp
/usr/lib/mkdev/hostmib
/etc/init.d/hostmib
/etc/nfs
/etc/nis
/etc/rpcinit
/usr/lib/cleantmp

3. Solution

The proper solution is to install the latest packages.

4. OpenServer 5.0.5

4.1 Location of Fixed Binaries

ftp://ftp.sco.com/pub/updates/OpenServer/CSSA-2003-SCO.27

4.2 Verification

MD5 (VOL.000.000) = 24ea1000e89272a3d2f12d9fd05de83f

md5 is available for download from
ftp://ftp.sco.com/pub/security/tools

4.3 Installing Fixed Binaries

Upgrade the affected binaries with the following sequence:

1) Download the VOL* files to the /tmp directory

2) Run the custom command, specify an install from media
images, and specify the /tmp directory as the location of
the images.

5. References

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0872

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

This security fix closes SCO incidents sr865679 fz521201
erg712072.

6. 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.

7. Acknowledgments

These vulnerabilities were discovered by Tomasz Kusmierz.

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