CVE-2023-1732

Summary

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.

Affected Software

Weaknesses

• CWE-20: CWE-20 Improper Input Validation
• CWE-755: CWE-755 Improper Handling of Exceptional Conditions

ADP Enrichment

CVE Program Container

Additional References

• https://github.com/cloudflare/circl/security/advisories/GHSA-2q89-485c-9j2x

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://github.com/cloudflare/circl/security/advisories/GHSA-2q89-485c-9j2x

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