Local code execution via stale method cache
Published Apr 10, 2022 · Updated Aug 2, 2024
Heap buffer overflow in mrb_vm_exec in mruby before 3.2 allows local users to execute arbitrary code through crafted Ruby code. mrb_remove_method deletes a method-table entry without clearing the class method cache, leaving stale dispatch state that drives an out-of-bounds heap write during VM execution. Exploitation requires attacker-controlled Ruby code to run in an affected interpreter or embedding process, where successful corruption grants code execution in that process.
Summary
What happened
Heap buffer overflow in mrb_vm_exec in mruby before 3.2 allows local users to execute arbitrary code through crafted Ruby code. mrb_remove_method deletes a method-table entry without clearing the class method cache, leaving stale dispatch state that drives an out-of-bounds heap write during VM execution. Exploitation requires attacker-controlled Ruby code to run in an affected interpreter or embedding process, where successful corruption grants code execution in that process.
The record
- CVE
- CVE-2022-1286
- Published
- Apr 10, 2022
- Updated
- Aug 2, 2024
- Vendor
- mruby
- Product
- mruby
- Classifications
- CWE-787, CWE-122, T1203
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 10, 2022CVE publishedPublication date reported by the CVE source.
- Aug 2, 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?
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- Affected versionversion=unspecified <3.2
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
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Technologies
Your stack
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Your stack
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