NULL Pointer Dereference Affecting libxml2 package, versions <2.9.14+dfsg-1.3~deb12u1


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.6% (80th percentile)

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  • Snyk IDSNYK-DEBIAN12-LIBXML2-5747748
  • published6 Jul 2022
  • disclosed5 Jul 2022

Introduced: 5 Jul 2022

CVE-2022-2309  (opens in a new tab)
CWE-476  (opens in a new tab)

How to fix?

Upgrade Debian:12 libxml2 to version 2.9.14+dfsg-1.3~deb12u1 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 Debian. See How to fix? for Debian:12 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.

CVSS Scores

version 3.1