Vulnerability Name:

CVE-2022-2309 (CCN-230470)

Assigned:2022-06-18
Published:2022-06-18
Updated:2022-10-28
Summary: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 v3 Severity:7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.7 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
4.8 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Low
7.5 High (REDHAT CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.7 Medium (REDHAT Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
Vulnerability Type:CWE-476
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2022-2309

Source: XF
Type: UNKNOWN
libxml2-cve20222309-dos(230470)

Source: CCN
Type: lxml GIT Repository
Fix a crash when incorrect parser input occurs together with usages of iterwalk() on trees generated by the same parser.

Source: MISC
Type: Patch, Third Party Advisory
https://github.com/lxml/lxml/commit/86368e9cf70a0ad23cccd5ee32de847149af0c6f

Source: CONFIRM
Type: Exploit, Issue Tracking, Patch, Third Party Advisory
https://huntr.dev/bounties/8264e74f-edda-4c40-9956-49de635105ba

Source: CCN
Type: huntr Web site
NULL Pointer Dereference in function _appendStartNsEvents in lxml/lxml

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2022-ed17f59c1d

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2022-ed0eeb6a20

Source: GENTOO
Type: Third Party Advisory
GLSA-202208-06

Source: CONFIRM
Type: Third Party Advisory
https://security.netapp.com/advisory/ntap-20220915-0006/

Vulnerable Configuration:Configuration 1:
  • cpe:/a:lxml:lxml:*:*:*:*:*:*:*:* (Version < 4.9.1)
  • AND
  • cpe:/a:xmlsoft:libxml2:*:*:*:*:*:*:*:* (Version >= 2.9.10 and <= 2.9.14)

    • Configuration 2:
  • cpe:/o:fedoraproject:fedora:36:*:*:*:*:*:*:*
  • OR

    • Configuration RedHat 1:
  • cpe:/a:redhat:enterprise_linux:9:*:*:*:*:*:*:*

    • Configuration RedHat 2:
  • cpe:/a:redhat:enterprise_linux:9::appstream:*:*:*:*:*

    • Configuration RedHat 3:
  • cpe:/a:redhat:enterprise_linux:9:*:*:*:*:*:*:*

    • Configuration RedHat 4:
  • cpe:/a:redhat:enterprise_linux:9::appstream:*:*:*:*:*

    • Configuration RedHat 5:
  • cpe:/a:redhat:enterprise_linux:9:*:*:*:*:*:*:*

    • Configuration RedHat 6:
  • cpe:/a:redhat:enterprise_linux:9::appstream:*:*:*:*:*

    • Configuration RedHat 7:
  • cpe:/a:redhat:enterprise_linux:9:*:*:*:*:*:*:*

    • Configuration RedHat 8:
  • cpe:/a:redhat:enterprise_linux:9::appstream:*:*:*:*:*

    • Configuration RedHat 9:
  • cpe:/a:redhat:enterprise_linux:9:*:*:*:*:*:*:*

    • Configuration RedHat 10:
  • cpe:/a:redhat:enterprise_linux:9::appstream:*:*:*:*:*

    • Configuration RedHat 11:
  • cpe:/a:redhat:enterprise_linux:9:*:*:*:*:*:*:*

    • Configuration RedHat 12:
  • cpe:/a:redhat:enterprise_linux:9::appstream:*:*:*:*:*

    • Configuration RedHat 13:
  • cpe:/a:redhat:enterprise_linux:9:*:*:*:*:*:*:*

    • Configuration RedHat 14:
  • cpe:/a:redhat:enterprise_linux:9::appstream:*:*:*:*:*

    • Configuration RedHat 15:
  • cpe:/a:redhat:enterprise_linux:9:*:*:*:*:*:*:*

    • Configuration RedHat 16:
  • cpe:/a:redhat:enterprise_linux:9::appstream:*:*:*:*:*

    • Configuration RedHat 17:
  • cpe:/a:redhat:enterprise_linux:9:*:*:*:*:*:*:*

    • Configuration RedHat 18:
  • cpe:/a:redhat:enterprise_linux:9::appstream:*:*:*:*:*

    • Configuration RedHat 19:
  • cpe:/a:redhat:enterprise_linux:9:*:*:*:*:*:*:*

    • Configuration RedHat 20:
  • cpe:/a:redhat:enterprise_linux:9::appstream:*:*:*:*:*

    • Configuration RedHat 21:
  • cpe:/a:redhat:enterprise_linux:9:*:*:*:*:*:*:*

    • Configuration RedHat 22:
  • cpe:/a:redhat:enterprise_linux:9::appstream:*:*:*:*:*

    • Configuration RedHat 23:
  • cpe:/a:redhat:enterprise_linux:9:*:*:*:*:*:*:*

    • Configuration RedHat 24:
  • cpe:/a:redhat:enterprise_linux:9::appstream:*:*:*:*:*

    • Configuration RedHat 25:
  • cpe:/a:redhat:enterprise_linux:9:*:*:*:*:*:*:*

    • Configuration RedHat 26:
  • cpe:/a:redhat:enterprise_linux:9::appstream:*:*:*:*:*

    • Configuration RedHat 27:
  • cpe:/a:redhat:enterprise_linux:9:*:*:*:*:*:*:*

    • Configuration RedHat 28:
  • cpe:/a:redhat:enterprise_linux:9::appstream:*:*:*:*:*

    • Configuration RedHat 29:
  • cpe:/a:redhat:enterprise_linux:9:*:*:*:*:*:*:*

    • Configuration RedHat 30:
  • cpe:/a:redhat:enterprise_linux:9::appstream:*:*:*:*:*

    • Configuration RedHat 31:
  • cpe:/a:redhat:enterprise_linux:9:*:*:*:*:*:*:*

    • Configuration RedHat 32:
  • cpe:/a:redhat:enterprise_linux:9::appstream:*:*:*:*:*

    • Configuration RedHat 33:
  • cpe:/a:redhat:enterprise_linux:9:*:*:*:*:*:*:*

    • Configuration RedHat 34:
  • cpe:/a:redhat:enterprise_linux:9::appstream:*:*:*:*:*

    • Configuration RedHat 35:
  • cpe:/a:redhat:enterprise_linux:9:*:*:*:*:*:*:*

    • Configuration RedHat 36:
  • cpe:/a:redhat:enterprise_linux:9::appstream:*:*:*:*:*

    • Configuration RedHat 37:
  • cpe:/a:redhat:enterprise_linux:9:*:*:*:*:*:*:*

    • Configuration RedHat 38:
  • cpe:/a:redhat:enterprise_linux:9::appstream:*:*:*:*:*

    • Configuration RedHat 39:
  • cpe:/a:redhat:enterprise_linux:9:*:*:*:*:*:*:*

    • Configuration RedHat 40:
  • cpe:/a:redhat:enterprise_linux:9::appstream:*:*:*:*:*

    • Configuration RedHat 41:
  • cpe:/a:redhat:enterprise_linux:9:*:*:*:*:*:*:*

    • Configuration RedHat 42:
  • cpe:/a:redhat:enterprise_linux:9::appstream:*:*:*:*:*

    • Configuration RedHat 43:
  • cpe:/a:redhat:enterprise_linux:9:*:*:*:*:*:*:*

    • Configuration RedHat 44:
  • cpe:/a:redhat:enterprise_linux:9::appstream:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:xmlsoft:libxml2:2.9.10:-:*:*:*:*:*:*
  • OR cpe:/a:xmlsoft:libxml2:2.9.9:-:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.redhat.rhsa:def:20228226
    P
    		RHSA-2022:8226: python-lxml security update (Moderate)
    2022-11-15
    oval:org.opensuse.security:def:711
    P
    		Security update for python-lxml (Important)
    2022-08-26
    BACK
    lxml lxml *
    xmlsoft libxml2 *
    fedoraproject fedora 36
    xmlsoft libxml2 2.9.10 -
    xmlsoft libxml2 2.9.9 -