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seebugRootSSV:1600
HistoryApr 03, 2007 - 12:00 a.m.

PHP 5 PHP_Stream_Filter_Create()函数缓冲区溢出漏洞

2007-04-0300:00:00
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PHP是一款广泛使用的WEB开发脚本语言。

PHP php_stream_filter_create()存在缓冲区溢出，远程攻击者可利用此漏洞以应用程序进程权限执行任意指令。

当一个过滤器通过php_stream_filter_create()函数建立时，会首先在HASH表中通过名字搜索过滤器，如果不成功会检查是否有通用过滤器支持请求的过滤器，这通过如下代码执行：

if (SUCCESS == zend_hash_find(filter_hash, (char*)filtername, n, (void**)&factory)) {
    filter = factory->create_filter(filtername, filterparams, persistent TSRMLS_CC);
} else if ((period = strrchr(filtername, '.'))) {
    /* try a wildcard */
    char *wildname;

    wildname = estrdup(filtername);
    period = wildname + (period - filtername);
    while (period && !filter) {
        *period = '\0';
        strcat(wildname, ".*");
        if (SUCCESS == zend_hash_find(filter_hash, wildname, strlen(wildname), (void**)&factory)) {
            filter = factory->create_filter(filtername, filterparams, persistent TSRMLS_CC);
        }

        *period = '\0';
        period = strrchr(wildname, '.');
    }
    efree(wildname);
}

很显然这个函数假定字符串结尾不会包含点，因为没有为此保留额外的内存字节，因此尝试建立过滤器以点结尾的名字，可导致单字节溢出。

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不受影响系统

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升级到最新程序：

PHP PHP 5.2

* PHP PHP 5.2.1
  <a href="http://www.php.net/downloads.php#v5" target="_blank">http://www.php.net/downloads.php#v5</a>

PHP PHP 4.4.4

* PHP PHP 4.4.5
  <a href="http://www.php.net/downloads.php#v4" target="_blank">http://www.php.net/downloads.php#v4</a>


                                                &lt;?php

&nbsp;&nbsp;&nbsp;&nbsp;$url&nbsp;=&nbsp;&quot;php://filter/read=OFF_BY_ONE./resource=/etc/passwd&quot;;
&nbsp;&nbsp;&nbsp;&nbsp;fopen($url,&nbsp;&quot;r&quot;);
?&gt;
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