To: bugtraq@securityfocus.com announce@lists.caldera.com scoannmod@xenitec.on.ca full-disclosure@lists.netsys.com ______________________________________________________________________________ SCO Security Advisory Subject: UnixWare 7.1.1 Open UNIX 8.0.0 : uudecode performs inadequate checks on user-specified output files Advisory number: CSSA-2002-SCO.44 Issue date: 2002 December 11 Cross reference: ______________________________________________________________________________ 1. Problem Description From CERT VU#336083: If an attacker can convince a user to invoke uudecode on a malicious file without reviewing the included file name, the attacker can cause the user to overwrite any file accessible by the user. If the victim user has root privileges, the attacker can exploit this vulnerability to overwrite arbitrary files. With respect to symbolic links and named pipes, attackers who exploit this vulnerability can alter the normal operation of system scripts and running processes, significantly increasing the risk of system compromise. 2. Vulnerable Supported Versions System Binaries ---------------------------------------------------------------------- UnixWare 7.1.1 /usr/bin/uudecode Open UNIX 8.0.0 /usr/bin/uudecode 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-2002-SCO.44 4.2 Verification MD5 (erg712093.pkg.Z) = e893c7c27e181a576fa2289ee807884d 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 erg712093.pkg.Z to the /var/spool/pkg directory # uncompress /var/spool/pkg/erg712093.pkg.Z # pkgadd -d /var/spool/pkg/erg712093.pkg 5. Open UNIX 8.0.0 5.1 Location of Fixed Binaries ftp://ftp.sco.com/pub/updates/OpenUNIX/CSSA-2002-SCO.44 5.2 Verification MD5 (erg712093.pkg.Z) = e893c7c27e181a576fa2289ee807884d 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: Download erg712093.pkg.Z to the /var/spool/pkg directory # uncompress /var/spool/pkg/erg712093.pkg.Z # pkgadd -d /var/spool/pkg/erg712093.pkg 6. References Specific references for this advisory: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0178 http://www.kb.cert.org/vuls/id/336083 http://www.aerasec.de/security/index.html?id=ae-200204-033&lang=en SCO security resources: http://www.sco.com/support/security/index.html This security fix closes SCO incidents sr866875, fz521051, erg712093. 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 AERAsec discovered and researched this vulnerability. ______________________________________________________________________________
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