To: bugtraqat_private announceat_private scoannmodat_private full-disclosureat_private ______________________________________________________________________________ Caldera International, Inc. Security Advisory Subject: UnixWare 7.1.1 : buffer overflow in DNS resolver Advisory number: CSSA-2002-SCO.37 Issue date: 2002 August 23 Cross reference: ______________________________________________________________________________ 1. Problem Description 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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