CVE-2023-45287

Description

Before Go 1.20, the RSA based TLS key exchanges used the math/big library, which is not constant time. RSA blinding was applied to prevent timing attacks, but analysis shows this may not have been fully effective. In particular it appears as if the removal of PKCS#1 padding may leak timing information, which in turn could be used to recover session key bits. In Go 1.20, the crypto/tls library switched to a fully constant time RSA implementation, which we do not believe exhibits any timing side channels.

CVSS Metrics

• v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Trends

Current EPSS score: 0.18%• Percentile: 40%

Techniques & Countermeasures

• CWE-203•Observable Discrepancy

  The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.

Affected Systems

• go standard library•crypto/tls

  < 1.20.0

• golang•go

  < 1.20.0

• Go•stdlib

  < 1.20.0

References (6)

• https://go.dev/issue/20654
• https://go.dev/cl/326012/26
• https://groups.google.com/g/golang-announce/c/QMK8IQALDvA
• https://people.redhat.com/~hkario/marvin/
• https://pkg.go.dev/vuln/GO-2023-2375
• https://security.netapp.com/advisory/ntap-20240112-0005/