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Advisory details: gitlab / packagist/typo3/cms/CVE-2021-21357
Advisory ID gitlab/packagist/typo3/cms/CVE-2021-21357
Aliases CVE-2021-21357
GHSA-3vg7-jw9m-pc3f
Summary Path Traversal 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.
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (5)
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
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv2 https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/typo3/cms/CVE-2021-21357.yml
cvssv3.1 https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/typo3/cms/CVE-2021-21357.yml
Reference id Reference type URL
https://typo3.org/security/advisory/typo3-core-sa-2021-003
CVE-2021-21357 https://nvd.nist.gov/vuln/detail/CVE-2021-21357
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: AV:N/AC:L/Au:S/C:P/I:P/A:P Found at https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/typo3/cms/CVE-2021-21357.yml
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H Found at https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/typo3/cms/CVE-2021-21357.yml
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.