Unauthorized User Impersonation when Using X.509 Client Certificates
SubjectDnX509PrincipalExtractor does not correctly handle certain malformed X.509 certificate CN values, which can lead to reading the wrong value for the username. In a carefully crafted certificate, this can lead to an attacker impersonating another user.
Affected versions:
Spring Security 5.7.0 through 5.7.24; 5.8.0 through 5.8.26; 6.3.0 through 6.3.17; 6.4.0 through 6.4.17; 6.5.0 through 6.5.10.
An attacker who can present a carefully crafted X.509 certificate with a malformed CN value can impersonate another user via SubjectDnX509PrincipalExtractor.
CAPEC ID: N/A
Description: An attacker who can present a carefully crafted X.509 certificate with a malformed CN value can impersonate another user via SubjectDnX509PrincipalExtractor.