CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
75.5%
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.
github.com/advisories/GHSA-wrxv-2j5q-m38w
github.com/lxml/lxml
github.com/lxml/lxml/blob/master/CHANGES.txt
github.com/lxml/lxml/commit/86368e9cf70a0ad23cccd5ee32de847149af0c6f
github.com/pypa/advisory-database/tree/main/vulns/lxml/PYSEC-2022-230.yaml
huntr.dev/bounties/8264e74f-edda-4c40-9956-49de635105ba
lists.fedoraproject.org/archives/list/[email protected]/message/HGYC6L7ENH5VEGN3YWFBYMGKX6WNS7HZ
lists.fedoraproject.org/archives/list/[email protected]/message/URHHSIBTPTALXMECRLAC2EVDNAFSR5NO
nvd.nist.gov/vuln/detail/CVE-2022-2309
security.gentoo.org/glsa/202208-06
security.netapp.com/advisory/ntap-20220915-0006
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
75.5%