Heap corruption via BITFIELD integer overflow
Published Jul 21, 2021 · Updated Aug 3, 2024
Integer overflow in Redis 2.2 and later before fixed releases allows remote authenticated users to corrupt heap memory via crafted BITFIELD commands. The BITFIELD implementation on 32-bit builds overflows bit offsets after an attacker raises proto-max-bulk-len and submits specially crafted requests, causing out-of-bounds access and buffer overflow. Exploitation requires Redis command access and a 32-bit executable; consequences include heap disclosure, corruption, or possible remote code execution, while 64-bit builds are not affected.
Summary
What happened
Integer overflow in Redis 2.2 and later before fixed releases allows remote authenticated users to corrupt heap memory via crafted BITFIELD commands. The BITFIELD implementation on 32-bit builds overflows bit offsets after an attacker raises proto-max-bulk-len and submits specially crafted requests, causing out-of-bounds access and buffer overflow. Exploitation requires Redis command access and a 32-bit executable; consequences include heap disclosure, corruption, or possible remote code execution, while 64-bit builds are not affected.
The record
- CVE
- CVE-2021-32761
- Published
- Jul 21, 2021
- Updated
- Aug 3, 2024
- Vendor
- Redis
- Product
- Redis
- Classifications
- CWE-125, CWE-680, T1210
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 21, 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=>= 2.2, < 5.0.13
- Affected versionversion=>= 6.0.0, < 6.0.15
- Affected versionversion=>= 6.2.0, < 6.2.5
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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