CVE-2022-2309— NULL Pointer Dereference in lxml/lxml
Quick assessment
Affected
lxml lxml/lxml
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2022-2309
Vulnerability Information
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Vulnerability Title
NULL Pointer Dereference in lxml/lxml
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
lxml 和 libxml2 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
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。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2022-2309
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Patches & Fixes for CVE-2022-2309 (1)
Vendor Advisories for CVE-2022-2309 (3)
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https://security.netapp.com/advisory/ntap-20220915-0006/ x_refsource_CONFIRM
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https://huntr.dev/bounties/8264e74f-edda-4c40-9956-49de635105ba x_refsource_CONFIRM
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Mailing List Discussions for CVE-2022-2309 (2)
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/URHHSIBTPTALXMECRLAC2EVDNAFSR5NO/ vendor-advisory x_refsource_FEDORA
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HGYC6L7ENH5VEGN3YWFBYMGKX6WNS7HZ/ vendor-advisory x_refsource_FEDORA
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V. Comments for CVE-2022-2309
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