Authenticated remote code execution via stream listpack overflow
Published Oct 4, 2021 · Updated Aug 3, 2024
Integer overflow in Redis Streams allows remote authenticated users to corrupt the heap via oversized stream elements. The streamAppendItem path appended attacker-controlled fields to listpacks whose 32-bit length accounting could overflow near 4 GB. Exploitation requires greatly increasing two default input limits and sending huge XADD records; heap corruption is established, while code execution is potential.
Summary
What happened
Integer overflow in Redis Streams allows remote authenticated users to corrupt the heap via oversized stream elements. The streamAppendItem path appended attacker-controlled fields to listpacks whose 32-bit length accounting could overflow near 4 GB. Exploitation requires greatly increasing two default input limits and sending huge XADD records; heap corruption is established, while code execution is potential.
The record
- CVE
- CVE-2021-32627
- Published
- Oct 4, 2021
- Updated
- Aug 3, 2024
- Vendor
- Redis
- Product
- Redis
- Classifications
- CWE-680, T1210
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 4, 2021CVE 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=>= 5.0.0, < 5.0.14
- Affected versionversion=>= 6.0.0, < 6.0.16
- Affected versionversion=>= 6.2.0, < 6.2.6
What conditions does exploitation require?
What is affected?
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
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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