The UnixWare setuid root applications /usr/X/bin/Launch_Application
and /usr/X/bin/Remote_Apps are vulnerable to a local buffer overflow.
NetWare_Access and App_Sharing are also vulnerable, they are not
installed setuid but get root privs from /etc/security/tbc/privs.
The overflow occurs when the HOME environment variable is too long. The
overflow enables local users to take control over the program and
execute arbitrary code as root.
An exploit has been developed and tested on UnixWare 7.0.1. According to
Launch_Application and Remote_Apps have been removed from UnixWare 7.1.1
HOME=`perl -e 'print "x"x10000'`;export HOME;Launch_Application
A crash indicates that the system is vulnerable.
Remove the suid bits from Launch_Application and Remote_Apps.
Use the filepriv command to revoke the extra privs from
NetWare_Access and App_Sharing.
A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
been assigned yet.
02/11/2003 Initial vendor notification
02/11/2003 Initial vendor response
02/25/2003 Public Disclosure
Texonet Co. is credited with this discovery.
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Copyright © 2004 Verisign, Inc.
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