** Changed in: libxml2 (Ubuntu)
Status: New => Confirmed
** Information type changed from Private Security to Public Security
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https://bugs.launchpad.net/bugs/1996494
Title:
CVE-2022-2309: NULL Pointer Dereference allows attackers to cause a
denial of service (or application crash)
Status in libxml2 package in Ubuntu:
Confirmed
Bug 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.
Reference: https://ubuntu.com/security/CVE-2022-2309
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