Arbitrary file write via deserialization gadget chain
Published Dec 6, 2021 · Updated Aug 4, 2024
Deserialization in ThinkPHP 6.0.8 allows remote attackers to write arbitrary files through crafted serialized PHP objects. Adapter::__destruct invokes save on attacker-controlled adapter and file properties, reaching Local::write and file_put_contents with an attacker-chosen path and content. Exploitation requires an application endpoint that passes untrusted data to PHP unserialize; a writable web root turns the file write into PHP code execution.
Summary
What happened
Deserialization in ThinkPHP 6.0.8 allows remote attackers to write arbitrary files through crafted serialized PHP objects. Adapter::__destruct invokes save on attacker-controlled adapter and file properties, reaching Local::write and file_put_contents with an attacker-chosen path and content. Exploitation requires an application endpoint that passes untrusted data to PHP unserialize; a writable web root turns the file write into PHP code execution.
The record
- CVE
- CVE-2021-36564
- Published
- Dec 6, 2021
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-502, T1505.003
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 6, 2021CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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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.
Public exploit references
- ThinkPHP CacheStore command-execution proof of conceptproof of concept · demonstrated
- ThinkPHP Adapter arbitrary-file-write proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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