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CVE-2022-2309

Published: 5 July 2022

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.

Priority

Low

CVSS 3 base score: 7.5

Status

Package Release Status
libxml2
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
focal Needed

jammy Needed

kinetic Needed

trusty Not vulnerable
(code not present)
upstream
Released (2.10.0)
xenial Not vulnerable
(code not present)
Patches:
upstream: https://gitlab.gnome.org/GNOME/libxml2/-/commit/5930fe01963136ab92125feec0c6204d9c9225dc

lxml
Launchpad, Ubuntu, Debian
bionic Needs triage

focal Needs triage

impish Ignored
(reached end-of-life)
jammy Needs triage

kinetic Needs triage

trusty Needs triage

upstream
Released (4.9.1)
xenial Needs triage

Patches:

upstream: https://github.com/lxml/lxml/commit/86368e9cf70a0ad23cccd5ee32de847149af0c6f