Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Lxml | Lxml | < 4.9.1 |
| Xmlsoft | Libxml2 | >= 2.9.10, <= 2.9.14 |
| Fedoraproject | Fedora | 36 |
Related Weaknesses (CWE)
References
- https://github.com/lxml/lxml/commit/86368e9cf70a0ad23cccd5ee32de847149af0c6fPatchThird Party Advisory
- https://huntr.dev/bounties/8264e74f-edda-4c40-9956-49de635105baExploitIssue TrackingPatch
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202208-06Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220915-0006/Third Party Advisory
- https://github.com/lxml/lxml/commit/86368e9cf70a0ad23cccd5ee32de847149af0c6fPatchThird Party Advisory
- https://huntr.dev/bounties/8264e74f-edda-4c40-9956-49de635105baExploitIssue TrackingPatch
- https://lists.debian.org/debian-lts-announce/2024/09/msg00021.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202208-06Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220915-0006/Third Party Advisory
FAQ
What is CVE-2022-2309?
CVE-2022-2309 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 earlie...
How severe is CVE-2022-2309?
CVE-2022-2309 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-2309?
Check the references section above for vendor advisories and patch information. Affected products include: Lxml Lxml, Xmlsoft Libxml2, Fedoraproject Fedora.