CVE-2022-2309
Published: 5 July 2022
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.
Priority
Status
| Package | Release | Status |
|---|---|---|
|
libxml2 Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(code not present)
|
| lunar |
Released
(2.9.14+dfsg-1.1ubuntu0.1)
|
|
| focal |
Released
(2.9.10+dfsg-5ubuntu0.20.04.5)
|
|
| jammy |
Released
(2.9.13+dfsg-1ubuntu0.2)
|
|
| kinetic |
Released
(2.9.14+dfsg-1ubuntu0.1)
|
|
| mantic |
Not vulnerable
(2.9.14+dfsg-1.3)
|
|
| upstream |
Released
(2.10.0,2.9.14+dfsg-1.3)
|
|
|
Patches: upstream: https://gitlab.gnome.org/GNOME/libxml2/-/commit/5930fe01963136ab92125feec0c6204d9c9225dc |
||
|
lxml Launchpad, Ubuntu, Debian |
kinetic |
Ignored
(end of life, was needs-triage)
|
| jammy |
Needs triage
|
|
| lunar |
Not vulnerable
(4.9.1-1)
|
|
| trusty |
Needs triage
|
|
| upstream |
Released
(4.9.1)
|
|
| xenial |
Needs triage
|
|
| bionic |
Needs triage
|
|
| focal |
Needs triage
|
|
| impish |
Ignored
(end of life)
|
|
| mantic |
Not vulnerable
(4.9.1-1)
|
|
|
Patches: upstream: https://github.com/lxml/lxml/commit/86368e9cf70a0ad23cccd5ee32de847149af0c6f |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-2309
- https://huntr.dev/bounties/8264e74f-edda-4c40-9956-49de635105ba/
- https://github.com/lxml/lxml/commit/86368e9cf70a0ad23cccd5ee32de847149af0c6f (lxml-4.9.1)
- https://huntr.dev/bounties/8264e74f-edda-4c40-9956-49de635105ba
- https://github.com/lxml/lxml/commit/86368e9cf70a0ad23cccd5ee32de847149af0c6f
- https://gitlab.gnome.org/GNOME/libxml2/-/issues/378
- https://ubuntu.com/security/notices/USN-5760-1
- https://ubuntu.com/security/notices/USN-6028-2
- NVD
- Launchpad
- Debian