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CVE-2022-2309

CVE-2022-2309 · NULL Pointer Dereference in lxml/lxml

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 5.3 · Medium · EPSS 2.4% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • lxml/lxml

    Versions
    • ≥ unspecified, < 4.9.1: Affected (custom)

    Update to 4.9.1

  • libxml2 Debian:12

    Versions
    • 2.9.14+dfsg-1.2
    Affected ranges
    • ECOSYSTEM: < 2.9.14+dfsg-1.3~deb12u1

    Update to 2.9.14+dfsg-1.3~deb12u1

  • libxml2 Debian:13

    Affected ranges
    • ECOSYSTEM: < 2.9.14+dfsg-1.3

    Update to 2.9.14+dfsg-1.3

  • libxml2 Debian:14

    Affected ranges
    • ECOSYSTEM: < 2.9.14+dfsg-1.3

    Update to 2.9.14+dfsg-1.3

  • lxml Debian:12

    Affected ranges
    • ECOSYSTEM: < 4.9.1-1

    Update to 4.9.1-1

  • lxml Debian:13

    Affected ranges
    • ECOSYSTEM: < 4.9.1-1

    Update to 4.9.1-1

  • lxml Debian:14

    Affected ranges
    • ECOSYSTEM: < 4.9.1-1

    Update to 4.9.1-1

  • lxml PyPI

    Versions
    • 1.3.2
    • 1.3.3
    • 1.3.4
    • 1.3.5
    • 1.3.6
    • 2.0
    • 2.0.10
    • 2.0.11
    • 2.0.4
    • 2.0.5
    • 2.0.6
    • 2.0.7
    • 2.0.8
    • 2.0.9
    • 2.1
    • 2.1.1
    • 2.1.2
    • 2.1.3
    • 2.1.4
    • 2.1.5
    • 2.2
    • 2.2.1
    • 2.2.2
    • 2.2.3
    • 2.2.4
    • 2.2.5
    • 2.2.6
    • 2.2.7
    • 2.2.8
    • 2.3
    • 2.3.1
    • 2.3.2
    • 2.3.3
    • 2.3.4
    • 2.3.5
    • 2.3.6
    • 3.0
    • 3.0.2
    • 3.1.0
    • 3.1.1
    • 3.1.2
    • 3.2.0
    • 3.2.1
    • 3.2.2
    • 3.2.3
    • 3.2.4
    • 3.2.5
    • 3.3.0
    • 3.3.1
    • 3.3.2
    • 3.3.3
    • 3.3.4
    • 3.3.5
    • 3.3.6
    • 3.4.0
    • 3.4.1
    • 3.4.2
    • 3.4.3
    • 3.4.4
    • 3.5.0
    • 3.6.0
    • 3.6.1
    • 3.6.2
    • 3.6.3
    • 3.6.4
    • 3.7.0
    • 3.7.1
    • 3.7.2
    • 3.7.3
    • 3.8.0
    • 4.0.0
    • 4.1.0
    • 4.1.1
    • 4.2.0
    • 4.2.1
    • 4.2.2
    • 4.2.3
    • 4.2.4
    • 4.2.5
    • 4.2.6
    • 4.3.0
    • 4.3.2
    • 4.3.3
    • 4.3.4
    • 4.3.5
    • 4.4.0
    • 4.4.1
    • 4.4.2
    • 4.4.3
    • 4.5.0
    • 4.5.1
    • 4.5.2
    • 4.6.0
    • 4.6.1
    • 4.6.2
    • 4.6.3
    • 4.6.4
    • 4.6.5
    • 4.7.1
    • 4.8.0
    • 4.9.0
    Affected ranges
    • ECOSYSTEM: < 4.9.1

    Update to 4.9.1

  • lxml PyPI

    Versions
    • 0.9
    • 0.9.1
    • 0.9.2
    • 1.0
    • 1.0.1
    • 1.0.2
    • 1.0.3
    • 1.0.4
    • 1.0.beta
    • 1.1
    • 1.1.1
    • 1.1.2
    • 1.1alpha
    • 1.1beta
    • 1.2
    • 1.2.1
    • 1.3
    • 1.3.1
    • 1.3.2
    • 1.3.3
    • 1.3.4
    • 1.3.5
    • 1.3.6
    • 1.3beta
    • 2.0
    • 2.0.1
    • 2.0.10
    • 2.0.11
    • 2.0.2
    • 2.0.3
    • 2.0.4
    • 2.0.5
    • 2.0.6
    • 2.0.7
    • 2.0.8
    • 2.0.9
    • 2.0alpha1
    • 2.0alpha2
    • 2.0alpha3
    • 2.0alpha4
    • 2.0alpha5
    • 2.0alpha6
    • 2.0beta1
    • 2.0beta2
    • 2.1
    • 2.1.1
    • 2.1.2
    • 2.1.3
    • 2.1.4
    • 2.1.5
    • 2.1alpha1
    • 2.1beta1
    • 2.1beta2
    • 2.1beta3
    • 2.2
    • 2.2.1
    • 2.2.2
    • 2.2.3
    • 2.2.4
    • 2.2.5
    • 2.2.6
    • 2.2.7
    • 2.2.8
    • 2.2alpha1
    • 2.2beta1
    • 2.2beta2
    • 2.2beta3
    • 2.2beta4
    • 2.3
    • 2.3.1
    • 2.3.2
    • 2.3.3
    • 2.3.4
    • 2.3.5
    • 2.3.6
    • 2.3alpha1
    • 2.3alpha2
    • 2.3beta1
    • 3.0
    • 3.0.1
    • 3.0.2
    • 3.1.0
    • 3.1.1
    • 3.1.2
    • 3.1beta1
    • 3.2.0
    • 3.2.1
    • 3.2.2
    • 3.2.3
    • 3.2.4
    • 3.2.5
    • 3.3.0
    • 3.3.0beta1
    • 3.3.0beta2
    • 3.3.0beta3
    • 3.3.0beta4
    • 3.3.0beta5
    • 3.3.1
    • 3.3.2
    • 3.3.3
    • 3.3.4
    • 3.3.5
    • 3.3.6
    • 3.4.0
    • 3.4.1
    • 3.4.2
    • 3.4.3
    • 3.4.4
    • 3.5.0
    • 3.5.0b1
    • 3.6.0
    • 3.6.1
    • 3.6.2
    • 3.6.3
    • 3.6.4
    • 3.7.0
    • 3.7.1
    • 3.7.2
    • 3.7.3
    • 3.8.0
    • 4.0.0
    • 4.1.0
    • 4.1.1
    • 4.2.0
    • 4.2.1
    • 4.2.2
    • 4.2.3
    • 4.2.4
    • 4.2.5
    • 4.2.6
    • 4.3.0
    • 4.3.1
    • 4.3.2
    • 4.3.3
    • 4.3.4
    • 4.3.5
    • 4.4.0
    • 4.4.1
    • 4.4.2
    • 4.4.3
    • 4.5.0
    • 4.5.1
    • 4.5.2
    • 4.6.0
    • 4.6.1
    • 4.6.2
    • 4.6.3
    • 4.6.4
    • 4.6.5
    • 4.7.0
    • 4.7.1
    • 4.8.0
    • 4.9.0
    Affected ranges
    • GIT: < 86368e9cf70a0ad23cccd5ee32de847149af0c6f
    • ECOSYSTEM: < 4.9.1

    Update to 4.9.1

  • lxml Ubuntu:Pro:14.04:LTS

    Versions
    • 3.2.0-1
    • 3.3.0~beta2-1
    • 3.3.0~beta4-1
    • 3.3.1-1
    • 3.3.2-1
    • 3.3.2-1build1
    • 3.3.3-1
    • 3.3.3-1ubuntu0.1
    • 3.3.3-1ubuntu0.2
    • 3.3.3-1ubuntu0.2+esm1
    • 3.3.3-1ubuntu0.2+esm2
    • 3.3.3-1ubuntu0.2+esm3
    • 3.3.3-1ubuntu0.2+esm5
    • 3.3.3-1ubuntu0.2+esm6
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • lxml Ubuntu:Pro:16.04:LTS

    Versions
    • 3.4.4-1
    • 3.5.0-1
    • 3.5.0-1build1
    • 3.5.0-1ubuntu0.1
    • 3.5.0-1ubuntu0.2
    • 3.5.0-1ubuntu0.3
    • 3.5.0-1ubuntu0.4
    • 3.5.0-1ubuntu0.4+esm2
    • 3.5.0-1ubuntu0.4+esm3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • lxml Ubuntu:Pro:18.04:LTS

    Versions
    • 4.0.0-1
    • 4.1.0-1
    • 4.2.0-1
    • 4.2.1-1
    • 4.2.1-1ubuntu0.1
    • 4.2.1-1ubuntu0.2
    • 4.2.1-1ubuntu0.3
    • 4.2.1-1ubuntu0.4
    • 4.2.1-1ubuntu0.6
    • 4.2.1-1ubuntu0.6+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libxml2 Ubuntu:20.04:LTS

    Versions
    • 2.9.4+dfsg1-7ubuntu3
    • 2.9.4+dfsg1-7ubuntu5
    • 2.9.4+dfsg1-8ubuntu1
    • 2.9.4+dfsg1-8ubuntu2
    • 2.9.4+dfsg1-8ubuntu3
    • 2.9.10+dfsg-1ubuntu3
    • 2.9.10+dfsg-4build1
    • 2.9.10+dfsg-5
    • 2.9.10+dfsg-5ubuntu0.20.04.1
    • 2.9.10+dfsg-5ubuntu0.20.04.2
    • 2.9.10+dfsg-5ubuntu0.20.04.3
    • 2.9.10+dfsg-5ubuntu0.20.04.4
    Affected ranges
    • ECOSYSTEM: < 2.9.10+dfsg-5ubuntu0.20.04.5

    Update to 2.9.10+dfsg-5ubuntu0.20.04.5

  • lxml Ubuntu:Pro:20.04:LTS

    Versions
    • 4.4.1-1
    • 4.4.1-1build1
    • 4.4.2-1
    • 4.5.0-1
    • 4.5.0-1ubuntu0.1
    • 4.5.0-1ubuntu0.2
    • 4.5.0-1ubuntu0.3
    • 4.5.0-1ubuntu0.5
    • 4.5.0-1ubuntu0.5+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libxml2 Ubuntu:22.04:LTS

    Versions
    • 2.9.12+dfsg-4
    • 2.9.12+dfsg-5
    • 2.9.12+dfsg-6
    • 2.9.13+dfsg-1
    • 2.9.13+dfsg-1build1
    • 2.9.13+dfsg-1ubuntu0.1
    Affected ranges
    • ECOSYSTEM: < 2.9.13+dfsg-1ubuntu0.2

    Update to 2.9.13+dfsg-1ubuntu0.2

  • lxml Ubuntu:22.04:LTS

    Versions
    • 4.6.3+dfsg-0.1
    • 4.6.4-1
    • 4.6.4-1ubuntu1
    • 4.7.1-1
    • 4.8.0-1
    • 4.8.0-1build1
    • 4.8.0-1ubuntu0.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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