Code execution via deserialized iterator callback
Published Apr 27, 2021 · Updated Aug 3, 2024
Object injection in WordPress.org Requests 1.6.0 through 1.7.0 allows remote attackers to execute PHP callbacks via serialized data. Requests_Utility_FilteredIterator restores an attacker-controlled callback during unserialization, and current() passes an iterated value to call_user_func. Exploitation requires a consuming application to unserialize attacker-controlled data and invoke the iterator, permitting code execution in that application's PHP process.
Summary
What happened
Object injection in WordPress.org Requests 1.6.0 through 1.7.0 allows remote attackers to execute PHP callbacks via serialized data. Requests_Utility_FilteredIterator restores an attacker-controlled callback during unserialization, and current() passes an iterated value to call_user_func. Exploitation requires a consuming application to unserialize attacker-controlled data and invoke the iterator, permitting code execution in that application's PHP process.
The record
- CVE
- CVE-2021-29476
- Published
- Apr 27, 2021
- Updated
- Aug 3, 2024
- Vendor
- WordPress.org
- Product
- Requests
- Classifications
- CWE-502
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 27, 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=>= 1.6.0, < 1.8.0
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
- FilteredIterator serialized callback 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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