Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-3vg7-jw9m-pc3f
Advisory ID github_osv/GHSA-3vg7-jw9m-pc3f
Aliases CVE-2021-21357
Summary Broken Access Control in Form Framework ### Problem Due to improper input validation, attackers can by-pass restrictions of predefined options and submit arbitrary data in the Form Designer backend module of the Form Framework. In the default configuration of the Form Framework this allows attackers to explicitly allow arbitrary mime-types for file uploads - however, default _fileDenyPattern_ successfully blocked files like _.htaccess_ or _malicious.php_. Besides that, attackers can persist those files in any writable directory of the corresponding TYPO3 installation. A valid backend user account with access to the form module is needed to exploit this vulnerability. ### Solution Update to TYPO3 versions 8.7.40, 9.5.25, 10.4.14, 11.1.1 that fix the problem described. ### Credits Thanks to Richie Lee who reported this issue and to TYPO3 contributor Ralf Zimmermann who fixed the issue. ### References * [TYPO3-CORE-SA-2021-003](https://typo3.org/security/advisory/typo3-core-sa-2021-003)
Status Published
Exploitability 0.5
Weighted Severity 7.5
Risk 3.8
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (3)
CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-20 Improper Input Validation
CWE-434 Unrestricted Upload of File with Dangerous Type
System Score Found at
cvssv3.1 8.3 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/03/GHSA-3vg7-jw9m-pc3f/GHSA-3vg7-jw9m-pc3f.json
generic_textual HIGH
Reference id Reference type URL
https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-21357.yaml
https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-21357.yaml
https://packagist.org/packages/typo3/cms-form
https://typo3.org/security/advisory/typo3-core-sa-2021-003
CVE-2021-21357 https://nvd.nist.gov/vuln/detail/CVE-2021-21357
GHSA-3vg7-jw9m-pc3f https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-3vg7-jw9m-pc3f
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H/E:H/RL:O/RC:C Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/03/GHSA-3vg7-jw9m-pc3f/GHSA-3vg7-jw9m-pc3f.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

There are no SSVC decisions available.