Code execution via unrestricted image upload
Published May 5, 2021 · Updated Aug 3, 2024
Arbitrary file upload in denovembre Event Banner 1.3 and earlier allows remote authenticated users to execute code via an uploaded PHP file. The administrative banner form's upload handler accepts the multipart image field and stores its filename and contents under wp-content/uploads/event_banner without checking the file type. Direct exploitation requires an administrator session; absent CSRF checks also let context-dependent attackers induce an administrator to submit the upload, after which the PHP file is web-accessible.
Summary
What happened
Arbitrary file upload in denovembre Event Banner 1.3 and earlier allows remote authenticated users to execute code via an uploaded PHP file. The administrative banner form's upload handler accepts the multipart image field and stores its filename and contents under wp-content/uploads/event_banner without checking the file type. Direct exploitation requires an administrator session; absent CSRF checks also let context-dependent attackers induce an administrator to submit the upload, after which the PHP file is web-accessible.
The record
- CVE
- CVE-2021-24252
- Published
- May 5, 2021
- Updated
- Aug 3, 2024
- Vendor
- denovembre
- Product
- Event Banner
- Classifications
- CWE-434, T1190
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- May 5, 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=1.3 <=1.3
What conditions does exploitation require?
What is affected?
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
- WPScan multipart PHP upload proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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