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seebugRootSSV:1598
HistoryApr 03, 2007 - 12:00 a.m.

PHP sqlite_udf_decode_binary()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 sqlite_udf_decode_binary()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。

sqlite_udf_decode_binary()函数不正确处理非法字符串，当传递字符串只包含单个\x01字符会调用sqlite_decode_binary()使用空字符串作为参数，但这个API函数不支持，它需要调用的字符串长度至少为1：

int sqlite_decode_binary(const unsigned char *in, unsigned char *out){
int i, e;
unsigned char c;
e = *(in++);
i = 0;
while( (c = *(in++))!=0 ){
if( c==1 ){
c = *(in++) - 1;
}
out[i++] = c + e;
}
return i;
}

当sqlite_decode_binary()使用空字符串调用，就会跳过ASCIIZ终止符而拷贝字节到目的区，直到遇到下个ASCIIZ字符。这类似标准的strcpy()溢出。

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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>


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