lxml: CVE-2022-2309

Debian Bug report logs - #1014766
lxml: CVE-2022-2309

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Moritz Mühlenhoff <jmm@inutil.org>

To: submit@bugs.debian.org

Subject: lxml: CVE-2022-2309

Date: Mon, 11 Jul 2022 19:56:50 +0200

Source: lxml
X-Debbugs-CC: team@security.debian.org
Severity: important
Tags: security

Hi,

The following vulnerability was published for lxml.

CVE-2022-2309[0]:
| 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.

https://huntr.dev/bounties/8264e74f-edda-4c40-9956-49de635105ba/
https://github.com/lxml/lxml/commit/86368e9cf70a0ad23cccd5ee32de847149af0c6f (lxml-4.9.1)

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-2022-2309
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-2309

Please adjust the affected versions in the BTS as needed.

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