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Home » Hacking News » CSSA-2002-SCO.37-buffer overflow in DNS resolver

CSSA-2002-SCO.37-buffer overflow in DNS resolver

by Nikola Strahija on August 25th, 2002 From CERT CA-2002-19: A buffer overflow vulnerability exists in multiple implementations of DNS resolver libraries. Operating systems and applications that utilize vulnerable DNS resolver libraries may be affected. A remote attacker who is able to send malicious DNS responses could potentially exploit this vulnerability to execute arbitrary code or cause a denial of service on a vulnerable system.


2. Vulnerable Supported Versions

System Binaries
----------------------------------------------------------------------
UnixWare 7.1.1 /usr/lib/nslookup.help
/usr/sbin/addr
/usr/sbin/dig
/usr/sbin/dnskeygen
/usr/sbin/dnsquery
/usr/sbin/host
/usr/sbin/in.named
/usr/sbin/irpd
/usr/sbin/mkservdb
/usr/sbin/named-bootconf
/usr/sbin/named-xfer
/usr/sbin/ndc
/usr/sbin/nslookup
/usr/sbin/nsupdate


3. Solution

The proper solution is to install the latest packages.


4. UnixWare 7.1.1

4.1 Location of Fixed Binaries

ftp://ftp.caldera.com/pub/updates/UnixWare/CSSA-2002-SCO.37


4.2 Verification

MD5 (erg501624.pkg.Z) = cb425affbc7740e3338dfd55409ba0f0

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


4.3 Installing Fixed Binaries

Upgrade the affected binaries with the following commands:

Download erg501624.pkg.Z to the /var/spool/pkg directory

# uncompress /var/spool/pkg/erg501624.pkg.Z
# pkgadd -d /var/spool/pkg/erg501624.pkg


5. References

Specific references for this advisory:
http://www.isc.org/products/BIND/bind-security.html
http://www.pine.nl/advisories/pine-cert-20020601.asc
http://www.kb.cert.org/vuls/id/803539
http://www.cert.org/advisories/CA-2002-19.html
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0651

Caldera security resources:
http://www.caldera.com/support/security/index.html

This security fix closes Caldera incidents sr866551, fz521493,
erg501624.


6. 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 products.


7. Acknowledgements

Caldera thanks Joost Pol of PINE-CERT and the FreeBSD Project
for their analysis of these vulnerabilities.

______________________________________________________________________________


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