Authenticated code execution via unchecked LZ4 copy
Published Mar 14, 2022 · Updated Aug 4, 2024
Heap buffer overflow in ClickHouse before 21.10.2.15 allows remote authenticated users to execute code via a malicious LZ4 query. LZ4::decompressImpl passes attacker-controlled lengths to wildCopy before bounding the copy target to the destination buffer, allowing controlled bytes to overwrite adjacent heap memory. Any valid low-privilege account with read permissions can reach the decoder, and successful corruption can crash the server or execute code in its process.
Summary
What happened
Heap buffer overflow in ClickHouse before 21.10.2.15 allows remote authenticated users to execute code via a malicious LZ4 query. LZ4::decompressImpl passes attacker-controlled lengths to wildCopy before bounding the copy target to the destination buffer, allowing controlled bytes to overwrite adjacent heap memory. Any valid low-privilege account with read permissions can reach the decoder, and successful corruption can crash the server or execute code in its process.
The record
- CVE
- CVE-2021-43304
- Published
- Mar 14, 2022
- Updated
- Aug 4, 2024
- Vendor
- ClickHouse
- Product
- ClickHouse
- Classifications
- CWE-122, CWE-787, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 14, 2022CVE publishedPublication date reported by the CVE source.
- Aug 4, 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 <21.10.2.15-stable
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.
Weakness, pattern, technique
Public exploit references
- JFrog crafted LZ4 decompression payloadproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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