Vulnerability Name:

CVE-2021-21355 (CCN-198278)

Assigned:2020-03-16
Published:2020-03-16
Updated:2021-03-26
Summary:TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 8.7.40, 9.5.25, 10.4.14, 11.1.1, due to the lack of ensuring file extensions belong to configured allowed mime-types, attackers can upload arbitrary data with arbitrary file extensions - however, default _fileDenyPattern_ successfully blocked files like _.htaccess_ or _malicious.php_. Besides that, _UploadedFileReferenceConverter_ transforming uploaded files into proper FileReference domain model objects handles possible file uploads for other extensions as well - given those extensions use the Extbase MVC framework, make use of FileReference items in their direct or inherited domain model definitions and did not implement their own type converter. In case this scenario applies, _UploadedFileReferenceConverter_ accepts any file mime-type and persists files in the default location. In any way, uploaded files are placed in the default location _/fileadmin/user_upload/_, in most scenarios keeping the submitted filename - which allows attackers to directly reference files, or even correctly guess filenames used by other individuals, disclosing this information. No authentication is required to exploit this vulnerability. This is fixed in versions 8.7.40, 9.5.25, 10.4.14, 11.1.1.
CVSS v3 Severity:8.6 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L)
7.5 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L/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): Low
Integrity (I): High
Availibility (A): Low
8.6 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L)
7.5 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L/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): Low
Integrity (I): High
Availibility (A): Low
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
9.0 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:C/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Complete
Availibility (A): Partial
Vulnerability Type:CWE-552
CWE-434
Vulnerability Consequences:Gain Access
References:Source: MITRE
Type: CNA
CVE-2021-21355

Source: XF
Type: UNKNOWN
typo3-cve202121355-file-upload(198278)

Source: CONFIRM
Type: Third Party Advisory
https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-2r6j-862c-m2v2

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

Source: CCN
Type: TYPO3-CORE-SA-2021-002
Unrestricted File Upload in Form Framework

Source: MISC
Type: Vendor Advisory
https://typo3.org/security/advisory/typo3-core-sa-2021-002

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2021-21355

Vulnerable Configuration:Configuration 1:
  • cpe:/a:typo3:typo3:*:*:*:*:*:*:*:* (Version >= 8.0.0 and < 8.7.40)
  • OR 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 *
    typo3 typo3 11.1.0
    typo3 typo3 10.4.13