Service interruption via debug parser out-of-bounds read
Published Jun 14, 2023 · Updated Jan 2, 2025
Out-of-bounds read in Cloudflare lua-resty-json allows attackers to interrupt a service when debug parsing handles untrusted JSON. The dump_obj debug function reads reverse_nesting_order unconditionally even when the parsed object is not composite, accessing outside the intended bounds. The path exists only in tests and demos, so standard deployments are not exploitable; a consumer must expose the debug parser to untrusted data for service interruption.
Summary
What happened
Out-of-bounds read in Cloudflare lua-resty-json allows attackers to interrupt a service when debug parsing handles untrusted JSON. The dump_obj debug function reads reverse_nesting_order unconditionally even when the parsed object is not composite, accessing outside the intended bounds. The path exists only in tests and demos, so standard deployments are not exploitable; a consumer must expose the debug parser to untrusted data for service interruption.
The record
- CVE
- CVE-2023-3040
- Published
- Jun 14, 2023
- Updated
- Jan 2, 2025
- Vendor
- Cloudflare
- Product
- lua-resty-json
- Classifications
- CWE-125, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 14, 2023CVE publishedPublication date reported by the CVE source.
- Jan 2, 2025Record 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 <14 changes=[{"at":"14","status":"unaffected"}]
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
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Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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