To: bugtraqat_private announceat_private ______________________________________________________________________________ SCO Security Advisory Subject: UnixWare 7.1.1 Open UNIX 8.0.0 : Several vulnerabilities in XDR/RPC routines Advisory number: CSSA-2003-SCO.7 Issue date: 2003 March 19 Cross reference: ______________________________________________________________________________ 1. Problem Description The implementation of xdr_array can be tricked into writing beyond the buffers it allocated when deserializing the XDR stream. The xdrmem_getbytes() function in the XDR library provided by Sun Microsystems contains an integer overflow that can lead to improperly sized dynamic memory allocation. 2. Vulnerable Supported Versions System Binaries ---------------------------------------------------------------------- UnixWare 7.1.1 /etc/conf/pack.d/krpc/Driver_atup.o /etc/conf/pack.d/krpc/Driver_mp.o /usr/lib/tmp/libnsl.so Open UNIX 8.0.0 /etc/conf/pack.d/krpc/Driver_atup.o /etc/conf/pack.d/krpc/Driver_mp.o /usr/lib/tmp/libnsl.so 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-2003-SCO.7 4.2 Verification MD5 (erg712182.pkg.Z) = a696dd236701b8b643e5f37660499dbe 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: NOTE: THE uw711m2 MAINTENANCE SUPPLEMENT MUST BE INSTALLED PRIOR TO INSTALLING THIS UPDATE. Download erg712182.pkg.Z to the /var/spool/pkg directory # uncompress /var/spool/pkg/erg712182.pkg.Z # pkgadd -d /var/spool/pkg/erg712182.pkg 5. Open UNIX 8.0.0 5.1 Location of Fixed Binaries ftp://ftp.sco.com/pub/updates/OpenUNIX/CSSA-2003-SCO.7 5.2 Verification MD5 (erg712182b.pkg.Z) = 9e973d410d7a9d9f0df971b0ceb7d140 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: NOTE: THE ou800pk4 MAINTENANCE SUPPLEMENT MUST BE INSTALLED PRIOR TO INSTALLING THIS UPDATE. Download erg712182b.pkg.Z to the /var/spool/pkg directory # uncompress /var/spool/pkg/erg712182b.pkg.Z # pkgadd -d /var/spool/pkg/erg712182b.pkg 6. References Specific references for this advisory: xdr_array: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0391 http://www.cert.org/advisories/CA-2002-25.html http://www.kb.cert.org/vuls/id/192995 http://bvlive01.iss.net/issEn/delivery/xforce/alertdetail.jsp?oid=20823 xdrmem_getbytes: http://www.kb.cert.org/vuls/id/516825 SCO security resources: http://www.sco.com/support/security/index.html This security fix closes SCO incidents sr872623, sr867443, fz526861, fz525725, erg712182, erg501642 . 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 ISS.net discovered and researched the xdr_array vulnerability. Riley Hassell of eEye discovered and researched the xdrmem_getbytes vulnerability. ______________________________________________________________________________
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