Local code execution via unchecked target class
Published Apr 22, 2022 · Updated Aug 3, 2024
An out-of-bounds read in mruby before 3.2 allows local users to crash the interpreter or execute arbitrary code via crafted Ruby. During super dispatch for a prepended class, mrb_vm_exec passes an unvalidated target_class to mrb_obj_is_kind_of, which reads outside the intended object. The user must be able to run Ruby code through the interpreter or an embedding application, and successful exploitation affects that process.
Summary
What happened
An out-of-bounds read in mruby before 3.2 allows local users to crash the interpreter or execute arbitrary code via crafted Ruby. During super dispatch for a prepended class, mrb_vm_exec passes an unvalidated target_class to mrb_obj_is_kind_of, which reads outside the intended object. The user must be able to run Ruby code through the interpreter or an embedding application, and successful exploitation affects that process.
The record
- CVE
- CVE-2022-1427
- Published
- Apr 22, 2022
- Updated
- Aug 3, 2024
- Vendor
- mruby
- Product
- mruby
- Classifications
- CWE-125, T1203
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 22, 2022CVE 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=unspecified <3.2
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.
Public exploit references
- huntr proof-of-concept Ruby scriptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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