// For flags

CVE-2023-45287

Before Go 1.20, the RSA based key exchange methods in crypto/tls may exhibit a timing side channel

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

Antes de Go 1.20, los intercambios de claves TLS basados en RSA utilizaban la librería math/big, que no es un tiempo constante. Se aplicó blinding RSA para prevenir ataques sincronizados, pero el análisis muestra que esto puede no haber sido completamente efectivo. En particular, parece que la eliminación del relleno PKCS#1 puede filtrar información de tiempo, que a su vez podría usarse para recuperar bits de clave de sesión. En Go 1.20, la librería crypto/tls cambió a una implementación RSA de tiempo completamente constante, que no creemos que muestre ningún canal lateral de temporización.

A flaw was found in the Golang crypto/tls standard library. In previous versions, the package was vulnerable to a Timing Side Channel attack by observing the time it took for RSA-based TLS key exchanges, which was not constant. This flaw allows a malicious user to gather information from the environment.

An update for containernetworking-plugins is now available for Red Hat Enterprise Linux 9.2 Extended Update Support.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Complete
Integrity
None
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2023-10-06 CVE Reserved
  • 2023-12-05 CVE Published
  • 2025-02-13 CVE Updated
  • 2025-03-30 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-203: Observable Discrepancy
  • CWE-208: Observable Timing Discrepancy
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Golang
Search vendor "Golang"
 Go
Search vendor "Golang" for product "Go"
 < 1.20.0
Search vendor "Golang" for product "Go" and version " < 1.20.0"
-
Affected