To: bugtraq (at) securityfocus (dot) com [email concealed] announce (at) lists.caldera (dot) com [email concealed]

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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:
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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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