VULNERABILITY

Ubuntu: (Multiple Advisories) (CVE-2022-2309): libxml2 vulnerabilities

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Ubuntu: (Multiple Advisories) (CVE-2022-2309): libxml2 vulnerabilities

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:P)
Published
07/05/2022
Created
12/06/2022
Added
12/05/2022
Modified
06/08/2023

Description

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.

Solution(s)

  • ubuntu-upgrade-libxml2
  • ubuntu-upgrade-libxml2-utils

References

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