Authenticated code execution via trash filename reconstruction
Published Jun 20, 2023 · Updated Apr 16, 2025
Unrestricted file upload in Pluck CMS 4.7.10 allows remote authenticated users to execute arbitrary code through trashcan_restoreitem.php. During trash restoration, trashcan_restoreitem.php splits shell.php.txt at the first two dots and rebuilds a name such as shell_copy.php, turning an allowed double-extension upload into executable PHP. Administrator access, a valid session, a staged file in the trash, and a web server that executes PHP from the files directory are required for host-level code execution.
Summary
What happened
Unrestricted file upload in Pluck CMS 4.7.10 allows remote authenticated users to execute arbitrary code through trashcan_restoreitem.php. During trash restoration, trashcan_restoreitem.php splits shell.php.txt at the first two dots and rebuilds a name such as shell_copy.php, turning an allowed double-extension upload into executable PHP. Administrator access, a valid session, a staged file in the trash, and a web server that executes PHP from the files directory are required for host-level code execution.
The record
- CVE
- CVE-2020-20969
- Published
- Jun 20, 2023
- Updated
- Apr 16, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-434, T1505.003
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Jun 20, 2023CVE publishedPublication date reported by the CVE source.
- Apr 16, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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
- CVE-2020-20969 proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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