Bug#1034843: vtk6: CVE-2021-42521

[Moritz Mühlenhoff]

Source: vtk6
X-Debbugs-CC: team at security.debian.org
Severity: important
Tags: security

Hi,

The following vulnerability was published for vtk6.

CVE-2021-42521[0]:
| There is a NULL pointer dereference vulnerability in VTK before 9.2.5,
| and it lies in IO/Infovis/vtkXMLTreeReader.cxx. The vendor didn't
| check the return value of libxml2 API 'xmlDocGetRootElement', and try
| to dereference it. It is unsafe as the return value can be NULL and
| that NULL pointer dereference may crash the application.

https://gitlab.kitware.com/vtk/vtk/-/issues/17818


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2021-42521
    https://www.cve.org/CVERecord?id=CVE-2021-42521

Please adjust the affected versions in the BTS as needed.