RSA key disclosure via cache-indexed base64 decoding
Published Jul 14, 2021 · Updated Aug 3, 2024
Information disclosure in wolfSSL before 4.6.0 allows local users to recover RSA key information during PEM decoding. The base64 decoder uses a secret-dependent lookup table instead of constant-time decoding, exposing accessed cache lines during key loading. Exploitation requires system-level control of an isolated environment that can single-step execution, as demonstrated with Intel SGX.
Summary
What happened
Information disclosure in wolfSSL before 4.6.0 allows local users to recover RSA key information during PEM decoding. The base64 decoder uses a secret-dependent lookup table instead of constant-time decoding, exposing accessed cache lines during key loading. Exploitation requires system-level control of an isolated environment that can single-step execution, as demonstrated with Intel SGX.
The record
- CVE
- CVE-2021-24116
- Published
- Jul 14, 2021
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-203
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Jul 14, 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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What is affected?
Affected products and versions are unavailable in this record.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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