Vulnerability Name:

CVE-2019-20041 (CCN-173605)

Assigned:2019-12-13
Published:2019-12-13
Updated:2022-11-23
Summary:wp_kses_bad_protocol in wp-includes/kses.php in WordPress before 5.3.1 mishandles the HTML5 colon named entity, allowing attackers to bypass input sanitization, as demonstrated by the javascript: substring.
CVSS v3 Severity:9.8 Critical (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
8.5 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/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): High
Integrity (I): High
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:L/A:N)
4.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/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): Low
Availibility (A): None
CVSS v2 Severity:7.5 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Partial
5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
Vulnerability Type:CWE-20
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2019-20041

Source: XF
Type: UNKNOWN
wp-cve201920041-sec-bypass(173605)

Source: CCN
Type: wordpress-develop GIT Repository
Update `wp_kses_bad_protocol()` to recognize `:` on uri attributes

Source: MISC
Type: Patch
https://github.com/WordPress/wordpress-develop/commit/b1975463dd995da19bb40d3fa0786498717e3c53

Source: MLIST
Type: Mailing List, Third Party Advisory
[debian-lts-announce] 20200114 [SECURITY] [DLA 2067-1] wordpress security update

Source: BUGTRAQ
Type: Mailing List, Third Party Advisory
20200108 [SECURITY] [DSA 4599-1] wordpress security update

Source: MISC
Type: Release Notes, Vendor Advisory
https://wordpress.org/news/2019/12/wordpress-5-3-1-security-and-maintenance-release/

Source: DEBIAN
Type: Third Party Advisory
DSA-4599

Source: DEBIAN
Type: Third Party Advisory
DSA-4677

Vulnerable Configuration:Configuration 1:
  • cpe:/a:wordpress:wordpress:*:*:*:*:*:*:*:* (Version < 5.3.1)

    • Configuration 2:
  • cpe:/o:debian:debian_linux:8.0:*:*:*:*:*:*:*
  • OR cpe:/o:debian:debian_linux:9.0:*:*:*:*:*:*:*
  • OR cpe:/o:debian:debian_linux:10.0:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:bufferapp:digg_digg:5.3.0::~~~wordpress~~:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.disco:def:2019200410000000
    V
    		CVE-2019-20041 on Ubuntu 19.04 (disco) - medium.
    2019-12-27
    oval:com.ubuntu.bionic:def:2019200410000000
    V
    		CVE-2019-20041 on Ubuntu 18.04 LTS (bionic) - medium.
    2019-12-27
    oval:com.ubuntu.xenial:def:2019200410000000
    V
    		CVE-2019-20041 on Ubuntu 16.04 LTS (xenial) - medium.
    2019-12-27
    BACK
    wordpress wordpress *
    debian debian linux 8.0
    debian debian linux 9.0
    debian debian linux 10.0
    bufferapp digg digg 5.3.0