Python zlib模块远程溢出漏洞

<a href="http://www.cnnvd.org.cn/web/xxk/ldxqById.tag?CNNVD=CNNVD-200804-317" target="_blank">http://www.cnnvd.org.cn/web/xxk/ldxqById.tag?CNNVD=CNNVD-200804-317</a><br/>

Python是一种开放源代码的脚本编程语言。Python的zlib扩展模块中用于flush解压流的方式获取一个输入参数来确定应flush多少数据。这个参数是一个有符型整数，没有经过过滤检查，因此如果传送了负值的话就会导致错误的内存分配，然后有符型整数会被转换为无符整数，触发缓冲区溢出。Python-2.5.2/Modules/zlibmodule.c：761PyDoc_STRVAR(decomp_flush__doc__,762"flush([length])--Returnastringcontaininganyremaining\n"763"decompresseddata.length,ifgiven,istheinitialsizeofthe\n"764"outputbuffer.\n"765"\n"766"Thedecompressorobjectcannolongerbeusedafterthiscall.");767768staticPyObject*769PyZlib_unflush(compobject*self,PyObject*args)770{771interr,length=DEFAULTALLOC;772PyObject*retval=NULL;773unsignedlongstart_total_out;774775if(!PyArg_ParseTuple(args,"|i:flush",&length))776returnNULL;777if(!(retval=PyString_FromStringAndSize(NULL,length)))778returnNULL;779780781ENTER_ZLIB782783start_total_out=self->zst.total_out;784self->zst.avail_out=length;785self->zst.next_out=(Byte*)PyString_AS_STRING(retval);786787Py_BEGIN_ALLOW_THREADS788err=inflate(&(self->zst),Z_FINISH);789Py_END_ALLOW_THREADSPyArg_ParseTuple()函数为Python和C之间的转换方式，如果提供了的话就会初始化长度变

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