If a TLS 1.3 client gets neither a PSK (pre shared key) extension nor a KSE (key share extension) when connecting to a malicious server, a default predictable buffer gets used for the IKM (Input Keying Material) value when generating the session master secret. Using a potentially known IKM value when generating the session master secret key compromises the key generated, allowing an eavesdropper to reconstruct it and potentially allowing access to or meddling with message contents in the session. This issue does not affect client validation of connected servers, nor expose private key information, but could result in an insecure TLS 1.3 session when not controlling both sides of the connection. wolfSSL recommends that TLS 1.3 client side users update the version of wolfSSL used. 
Published 2023-07-17 22:15:10
Updated 2023-07-28 13:54:15
Source wolfSSL Inc.
View at NVD,   CVE.org
Vulnerability category: Input validation

Products affected by CVE-2023-3724

Exploit prediction scoring system (EPSS) score for CVE-2023-3724

0.09%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 38 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2023-3724

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
9.1
CRITICAL CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
2.3
6.0
wolfSSL Inc.
8.8
HIGH CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
2.8
5.9
NIST

CWE ids for CVE-2023-3724

  • The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
    Assigned by: facts@wolfssl.com (Secondary)
  • The product does not validate, or incorrectly validates, a certificate.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2023-3724

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