Vulnerability Details CVE-2023-1732
When sampling randomness for a shared secret, the implementation of Kyber and FrodoKEM, did not check whether crypto/rand.Read() returns an error. In rare deployment cases (error thrown by the Read() function), this could lead to a predictable shared secret.
The tkn20 and blindrsa components did not check whether enough randomness was returned from the user provided randomness source. Typically the user provides crypto/rand.Reader, which in the vast majority of cases will always return the right number random bytes. In the cases where it does not, or the user provides a source that does not, the blinding for blindrsa is weak and integrity of the plaintext is not ensured in tkn20.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 41.5%
CVSS Severity
CVSS v3 Score 5.3
References
Products affected by CVE-2023-1732
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cpe:2.3:a:cloudflare:circl:-
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cpe:2.3:a:cloudflare:circl:1.0.0
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cpe:2.3:a:cloudflare:circl:1.1.0
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cpe:2.3:a:cloudflare:circl:1.2.0
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cpe:2.3:a:cloudflare:circl:1.3.0
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cpe:2.3:a:cloudflare:circl:1.3.1
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cpe:2.3:a:cloudflare:circl:1.3.2