PYSEC-2022-230

Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/lxml/PYSEC-2022-230.yaml
Aliases
Published
2022-07-05T10:15:00Z
Modified
2023-11-08T04:08:16.338038Z
Summary
[none]
Details

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.

References

Affected packages

PyPI / lxml

Package

Name
lxml

Affected ranges

Type
GIT
Repo
https://github.com/lxml/lxml
Events
Introduced
0The exact introduced commit is unknown
Fixed
Type
ECOSYSTEM
Events
Introduced
0The exact introduced commit is unknown
Fixed
4.9.1

Affected versions

0.*

0.9
0.9.1
0.9.2

1.*

1.0.beta
1.0
1.0.1
1.0.2
1.0.3
1.0.4
1.1alpha
1.1beta
1.1
1.1.1
1.1.2
1.2
1.2.1
1.3beta
1.3
1.3.1
1.3.2
1.3.3
1.3.4
1.3.5
1.3.6

2.*

2.0alpha1
2.0alpha2
2.0alpha3
2.0alpha4
2.0alpha5
2.0alpha6
2.0beta1
2.0beta2
2.0
2.0.1
2.0.2
2.0.3
2.0.4
2.0.5
2.0.6
2.0.7
2.0.8
2.0.9
2.0.10
2.0.11
2.1alpha1
2.1beta1
2.1beta2
2.1beta3
2.1
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
2.2alpha1
2.2beta1
2.2beta2
2.2beta3
2.2beta4
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
2.3alpha1
2.3alpha2
2.3beta1
2.3
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2.3.6

3.*

3.0
3.0.1
3.0.2
3.1beta1
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
3.3.0beta1
3.3.0beta2
3.3.0beta3
3.3.0beta4
3.3.0beta5
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
3.5.0b1
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.*

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