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SCO Security Advisory
Subject: UnixWare 7.1.3 Open UNIX 8.0.0 : Xsco contains a buffer
overflow that could be exploited to gain root privileges.
Advisory number: SCOSA-2004.2
Issue date: 2004 July 29
Cross reference: sr889370 fz528865 erg712546 CAN-2004-0083 CAN-2004-0084
CAN-2004-0106
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1. Problem Description
A buffer overflow in ReadFontAlias from dirfile.c of Xsco
may allow local users and remote attackers to execute
arbitrary code via a font alias file with a long token.
The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CAN-2004-0083 to this issue.
Buffer overflow in the ReadFontAlias function in Xsco,
when using the CopyISOLatin1Lowered function, may allow
local or remote authenticated users to execute arbitrary
code via a malformed entry in the font alias file.
The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CAN-2004-0084 to this issue.
Multiple flaws in reading font files.
The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CAN-2004-0106 to these issues.
2. Vulnerable Supported Versions
System Binaries
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UnixWare 7.1.3 /usr/X/bin/Xsco
Open UNIX 8.0.0 /usr/X/bin/Xsco
3. Solution
The proper solution is to install the latest packages.
4. UnixWare 7.1.3 / Open UNIX 8.0.0
4.1 Location of Fixed Binaries
ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2004.2
4.2 Verification
MD5 (erg712546.pkg.Z) = a7ca45fddc3990268e2779a16601b323
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:
Download erg712546.pkg.Z to the /var/spool/pkg directory
# uncompress /var/spool/pkg/erg712546.pkg.Z
# pkgadd -d /var/spool/pkg/erg712546.pkg
5. References
Specific references for this advisory:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0083
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0084
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0106
SCO security resources:
http://www.sco.com/support/security/index.html
SCO security advisories via email:
http://www.sco.com/support/forums/security.html
This security fix closes SCO incidents sr889370 fz528865
erg712546.
6. 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.
7. Acknowledgments
Greg MacManus (iDEFENSE Labs) is credited with the discovery
of this vulnerability. Additionally David Dawes discovered
further flaws in reading font files.
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