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NULL Pointer Dereference Affecting libxml2 package, versions <2.9.14-r1

0.0
high

Snyk CVSS

    Attack Complexity Low
    Availability High

    Threat Intelligence

    EPSS 0.46% (76th percentile)
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NVD
7.5 high
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SUSE
6.5 medium
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Red Hat
7.5 high

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  • Snyk ID SNYK-ALPINE314-LIBXML2-3040797
  • published 7 Oct 2022
  • disclosed 5 Jul 2022
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Introduced: 5 Jul 2022

CVE-2022-2309 Open this link in a new tab
CWE-476 Open this link in a new tab

How to fix?

Upgrade Alpine:3.14 libxml2 to version 2.9.14-r1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libxml2 package and not the libxml2 package as distributed by Alpine. See How to fix? for Alpine:3.14 relevant fixed versions and status.

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.