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Moderate severityNVD Advisory· Published May 10, 2023· Updated Jan 27, 2025

Improper random reading in CIRCL

CVE-2023-1732

Description

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
github.com/cloudflare/circlGo
< 1.3.31.3.3

Affected products

29

Patches

Vulnerability mechanics

References

5

News mentions

0

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