Memory disclosure and crash via wrapped bounds calculation
Published May 12, 2022 · Updated Aug 3, 2024
Out-of-bounds read in the XS engine in Moddable allows local users to read process memory by running crafted JavaScript. The DataView and TypedArray constructors calculate an end offset without detecting integer wraparound, so a crafted length can pass the bounds check and make fxUint8Getter dereference memory beyond the backing ArrayBuffer. Exploitation requires attacker-supplied JavaScript to run in the affected XS runtime; the demonstrated consequences are arbitrary memory disclosure and a process crash.
Summary
What happened
Out-of-bounds read in the XS engine in Moddable allows local users to read process memory by running crafted JavaScript. The DataView and TypedArray constructors calculate an end offset without detecting integer wraparound, so a crafted length can pass the bounds check and make fxUint8Getter dereference memory beyond the backing ArrayBuffer. Exploitation requires attacker-supplied JavaScript to run in the affected XS runtime; the demonstrated consequences are arbitrary memory disclosure and a process crash.
The record
- CVE
- CVE-2022-29368
- Published
- May 12, 2022
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-125, CAPEC-540
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 12, 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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What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
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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
- fxUint8Getter out-of-bounds read proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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