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Home » Hacking News » CSSA-2002-SCO.39-Buffer Overflow in Multiple DNS Resolver Libraries

CSSA-2002-SCO.39-Buffer Overflow in Multiple DNS Resolver Libraries

by Nikola Strahija on October 12th, 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
----------------------------------------------------------------------
OpenServer 5.0.5 /etc/named
/etc/named-xfer
/etc/dig
/etc/host
/etc/nsupdate
/etc/dnsquery
/etc/addr
/etc/dnskeygen
/etc/ndc
/usr/bin/nslookup
/usr/lib/libresolv.so.1
/usr/lib/libresolv.so
/usr/lib/libsocket.so.2
/usr/lib/libp/libresolv.so.1
/usr/lib/libp/libresolv.so
/usr/lib/libp/libsocket.so.2
/usr/lib/libp/libresolv.a
/usr/lib/libp/libsocket.a
/usr/lib/libresolv.a
/usr/lib/libsocket.a
/usr/include/arpa/nameser.h
/usr/include/resolv.h
/usr/include/netdb.h
/usr/include/rpc/raw.h

OpenServer 5.0.6 /etc/named
/etc/named-xfer
/etc/dig
/etc/host
/etc/nsupdate
/etc/dnsquery
/etc/addr
/etc/dnskeygen
/etc/ndc
/usr/bin/nslookup
/usr/lib/libresolv.so.1
/usr/lib/libresolv.so
/usr/lib/libsocket.so.2
/usr/lib/libp/libresolv.so.1
/usr/lib/libp/libresolv.so
/usr/lib/libp/libsocket.so.2
/usr/lib/libp/libresolv.a
/usr/lib/libp/libsocket.a
/usr/lib/libresolv.a
/usr/lib/libsocket.a
/usr/include/arpa/nameser.h
/usr/include/resolv.h
/usr/include/netdb.h
/usr/include/rpc/raw.h


3. Solution

The proper solution is to install the latest packages.


4. OpenServer 5.0.5

4.1 Location of Fixed Binaries

ftp://ftp.caldera.com/pub/updates/OpenServer/CSSA-2002-SCO.39


4.2 Verification

MD5 (VOL.000.000) = e2521962d5f6004c7c4a78c149806123
MD5 (VOL.001.000) = 4ee7bee645809f331d18f8ce27e72e82

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 commands:

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

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


5. OpenServer 5.0.6

5.1 Location of Fixed Binaries

ftp://ftp.caldera.com/pub/updates/OpenServer/CSSA-2002-SCO.39


5.2 Verification

MD5 (VOL.000.000) = e2521962d5f6004c7c4a78c149806123
MD5 (VOL.001.000) = 4ee7bee645809f331d18f8ce27e72e82

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 commands:

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

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


6. References

Specific references for this advisory:
http://www.cert.org/advisories/CA-2002-19.html
http://www.pine.nl/advisories/pine-cert-20020601.asc

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

This security fix closes SCO incidents sr866550, fz521495,
erg501625.


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

Joost Pol discovered and researched this
vulnerability.


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