PHP Str_Replace()整数溢出漏洞

PHP是一款广泛使用的WEB开发脚本语言。

PHP str_replace()内存分配存在整数溢出，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str_replace()调用后，代码会根据搜索路径长度切换到两个不同代码路径。单个字符搜索字符串会又不同函数处理，因为这可导致效率更高。有效方法部分代码如下：

Z_STRLEN_P(result) = len + (char_count * (to_len - 1));
Z_STRVAL_P(result) = target = emalloc(Z_STRLEN_P(result) + 1);
Z_TYPE_P(result) = IS_STRING;

很显然当char_count和to_len超过65537字节时会导致32位长度计数期整数溢出，在emalloc()调用处理时分配不够内存，在之后的替代操作时可溢出缓冲区。

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