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CVE-2022-2309

7.5 · HIGH

NULL Pointer Dereference allows attackers to cause a denial of service (or application crash).

Published Jul 5, 2022CWE-476EPSS 2.43%

Overview

CVE-2022-2309 is a high-severity vulnerability. It was published on July 5, 2022 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/lxml/lxml/commit/86368e9cf70a0ad23cccd5ee32de847149af0c6fRefhuntr.dev/bounties/8264e74f-edda-4c40-9956-49de635105baReflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HGYC6L7ENH5VEGN3YWFBYMGKX6WNS7HZ/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/URHHSIBTPTALXMECRLAC2EVDNAFSR5NO/Refsecurity.gentoo.org/glsa/202208-06Refsecurity.netapp.com/advisory/ntap-20220915-0006/GitHubgithub.com/lxml/lxml/commit/86368e9cf70a0ad23cccd5ee32de847149af0c6fRefhuntr.dev/bounties/8264e74f-edda-4c40-9956-49de635105baReflists.debian.org/debian-lts-announce/2024/09/msg00021.htmlReflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HGYC6L7ENH5VEGN3YWFBYMGKX6WNS7HZ/

How CyberStrike helps

Frequently asked questions

What is CVE-2022-2309?

CVE-2022-2309 is a high-severity vulnerability. It was published on July 5, 2022 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2022-2309?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2022-2309?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-2309?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-2309 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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