NULL Pointer Dereference in lxml/lxml

NULL Pointer Dereference allows attackers to cause a denial of service (or application crash). This only applies when lxml is used together with libxml2 2.9.10 through 2.9.14. libxml2 2.9.9 and earlier are not affected. It allows triggering crashes through forged input data, given a vulnerable code sequence in the application. The vulnerability is caused by the iterwalk function (also used by the canonicalize function). Such code shouldn't be in wide-spread use, given that parsing + iterwalk would usually be replaced with the more efficient iterparse function. However, an XML converter that serialises to C14N would also be vulnerable, for example, and there are legitimate use cases for this code sequence. If untrusted input is received (also remotely) and processed via iterwalk function, a crash can be triggered.

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空指针解引用

lxml 和 libxml2 代码问题漏洞

lxml是lxml个人开发者的一个可与Python交互用于定位Html中元素的软件。libxml2是开源的一个用来解析XML文档的函数库。它用C语言写成，并且能为多种语言所调用，例如C语言，C++，XSH。 lxml和libxml2 2.9.10版本至2.9.14版本存在代码问题漏洞。攻击者利用该漏洞通过伪造的输入数据触发崩溃。

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