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SCO Security Advisory

Subject: UnixWare 7.1.1 Open UNIX 8.0.0 : in.talkd format string vulnerabilities
Advisory number: CSSA-2002-SCO.42
Issue date: 2002 November 12
Cross reference:
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1. Problem Description

The in.talkd program is vulnerable to a format string bug
which can be exploited remotely. An attacker can request
a talk session with a crafted luser field and be able to
write memory and gain control of the flow of the in.talkd.
This vulnerability can also be exploited with the clt_addr
field and its resolved name (in conjuction with a DNS).

2. Vulnerable Supported Versions

System Binaries
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UnixWare 7.1.1 /usr/sbin/in.otalkd
/usr/sbin/in.talkd
Open UNIX 8.0.0 /usr/sbin/in.otalkd
/usr/sbin/in.talkd

3. Solution

The proper solution is to install the latest packages.

4. UnixWare 7.1.1

4.1 Location of Fixed Binaries

ftp://ftp.sco.com/pub/updates/OpenUNIX/CSSA-2002-SCO.42

4.2 Verification

MD5 (erg712055.pkg.Z) = 5cd91b194857bb3149efee8bf6e3e804

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:

Download erg712055.pkg.Z to the /var/spool/pkg directory

# uncompress /var/spool/pkg/erg712055.pkg.Z
# pkgadd -d /var/spool/pkg/erg712055.pkg

5. Open UNIX 8.0.0

5.1 Location of Fixed Binaries

ftp://ftp.sco.com/pub/updates/OpenUNIX/CSSA-2002-SCO.42

5.2 Verification

MD5 (erg712055.pkg.Z) = 5cd91b194857bb3149efee8bf6e3e804

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

5.3 Installing Fixed Binaries

Upgrade the affected binaries with the following sequence:

Download erg712055.pkg.Z to the /var/spool/pkg directory

# uncompress /var/spool/pkg/erg712055.pkg.Z
# pkgadd -d /var/spool/pkg/erg712055.pkg

6. References

Specific references for this advisory:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2000-1010
http://www.ngsec.com/docs/advisories/NGSEC-2002-3.txt

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

This security fix closes SCO incidents sr864879, fz521053,
erg712055.

7. 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.

8. Acknowledgements

It is difficult to say who actually discovered this
vulnerability. There are many candidates.

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