Arbitrary file persistence via unchecked form options
Published Mar 23, 2021 · Updated Aug 3, 2024
Broken access control in affected TYPO3 CMS releases allows remote authenticated users to persist files in writable directories. The Form Designer backend accepts arbitrary values for predefined Form Framework options, enabling upload MIME-type changes and attacker-chosen storage paths. Access to the form module is required; the default fileDenyPattern still blocks executable names such as .htaccess and malicious.php, bounding default exposure to nonblocked file types.
Summary
What happened
Broken access control in affected TYPO3 CMS releases allows remote authenticated users to persist files in writable directories. The Form Designer backend accepts arbitrary values for predefined Form Framework options, enabling upload MIME-type changes and attacker-chosen storage paths. Access to the form module is required; the default fileDenyPattern still blocks executable names such as .htaccess and malicious.php, bounding default exposure to nonblocked file types.
The record
- CVE
- CVE-2021-21357
- Published
- Mar 23, 2021
- Updated
- Aug 3, 2024
- Vendor
- in2code GmbH
- Product
- TYPO3 CMS
- Classifications
- CWE-20, CWE-434, CWE-22, T1105
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 23, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 10.0.0, <= 10.4.13
- Affected versionversion=>= 11.0.0, <= 11.1.0
- Affected versionversion=>= 8.0.0, <= 8.7.39
- Affected versionversion=>= 9.0.0, <= 9.5.24
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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