Service interruption via inconsistent parser state
Published Mar 21, 2020 · Updated Aug 5, 2024
Denial of service in UniValue before 1.0.5 allows context-dependent attackers to interrupt applications via malformed JSON input. UniValue::read() returns after parser errors without clearing partially populated object data, leaving key and value arrays at different lengths and triggering an exception during later serialization. Reachability depends on a consuming application passing attacker-controlled JSON to the library; a public Bitcoin Core demonstration used authenticated RPC and deeply nested JSON to cause a segmentation fault.
Summary
What happened
Denial of service in UniValue before 1.0.5 allows context-dependent attackers to interrupt applications via malformed JSON input. UniValue::read() returns after parser errors without clearing partially populated object data, leaving key and value arrays at different lengths and triggering an exception during later serialization. Reachability depends on a consuming application passing attacker-controlled JSON to the library; a public Bitcoin Core demonstration used authenticated RPC and deeply nested JSON to cause a segmentation fault.
The record
- CVE
- CVE-2019-18936
- Published
- Mar 21, 2020
- Updated
- Aug 5, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-674, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 21, 2020CVE publishedPublication date reported by the CVE source.
- Aug 5, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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
- Bitcoin Core RPC high-depth JSON demonstrationproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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