Vulnerability Name:

CVE-2021-21359 (CCN-198298)

Assigned:2020-12-22
Published:2021-03-16
Updated:2021-03-26
Summary:TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 9.5.25, 10.4.14, 11.1.1 requesting invalid or non-existing resources via HTTP triggers the page error handler which again could retrieve content to be shown as error message from another page. This leads to a scenario in which the application is calling itself recursively - amplifying the impact of the initial attack until the limits of the web server are exceeded. This is fixed in versions 9.5.25, 10.4.14, 11.1.1.
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)
6.5 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: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): None
Availibility (A): High
5.9 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
5.2 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): High
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
5.4 Medium (CCN CVSS v2 Vector: AV:N/AC:H/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): High
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-405
CWE-674
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-21359

Source: XF
Type: UNKNOWN
typo3-cve202121359-dos(198298)

Source: CONFIRM
Type: Third Party Advisory
https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-4p9g-qgx9-397p

Source: MISC
Type: Release Notes, Third Party Advisory
https://packagist.org/packages/typo3/cms-core

Source: CCN
Type: TYPO3-CORE-SA-2021-005
Denial of Service in Page Error Handling

Source: MISC
Type: Vendor Advisory
https://typo3.org/security/advisory/typo3-core-sa-2021-005

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2021-21359

Vulnerable Configuration:Configuration 1:
  • cpe:/a:typo3:typo3:*:*:*:*:*:*:*:* (Version >= 9.0.0 and < 9.5.25)
  • OR cpe:/a:typo3:typo3:*:*:*:*:*:*:*:* (Version >= 10.0.0 and < 10.4.14)
  • OR cpe:/a:typo3:typo3:*:*:*:*:*:*:*:* (Version >= 11.0.0 and < 11.1.1)

    • Configuration CCN 1:
  • cpe:/a:typo3:typo3:11.1.0:*:*:*:*:*:*:*
  • OR cpe:/a:typo3:typo3:10.4.13:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    typo3 typo3 *
    typo3 typo3 *
    typo3 typo3 *
    typo3 typo3 11.1.0
    typo3 typo3 10.4.13