Code execution via overflowed SDS buffer growth
Published Oct 4, 2021 · Updated Aug 4, 2024
Integer overflow in Redis before 5.0.14 and in 6.0.0 through 6.0.15 or 6.2.0 through 6.2.5 allows remote authenticated users to corrupt the heap. The sdsMakeRoomFor function doubles a requested SDS allocation length but checked header overhead against the old string length, allowing size_t wraparound and an undersized heap allocation. Exploitation requires permission to raise proto-max-bulk-len and crafted network payloads or commands, resulting in a server crash or code execution in the Redis process.
Summary
What happened
Integer overflow in Redis before 5.0.14 and in 6.0.0 through 6.0.15 or 6.2.0 through 6.2.5 allows remote authenticated users to corrupt the heap. The sdsMakeRoomFor function doubles a requested SDS allocation length but checked header overhead against the old string length, allowing size_t wraparound and an undersized heap allocation. Exploitation requires permission to raise proto-max-bulk-len and crafted network payloads or commands, resulting in a server crash or code execution in the Redis process.
The record
- CVE
- CVE-2021-41099
- Published
- Oct 4, 2021
- Updated
- Aug 4, 2024
- Vendor
- Redis
- Product
- Redis
- Classifications
- CWE-680, CWE-190, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 4, 2021CVE 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=< 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?
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
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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