An issue was discovered in Mbed TLS before 2.28.1 and 3.x before 3.2.0. In some configurations, an unauthenticated attacker can send an invalid ClientHello message to a DTLS server that causes a heap-based buffer over-read of up to 255 bytes. This can cause a server crash or possibly information disclosure based on error responses. Affected configurations have MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE enabled and MBEDTLS_SSL_IN_CONTENT_LEN less than a threshold that depends on the configuration: 258 bytes if using mbedtls_ssl_cookie_check, and possibly up to 571 bytes with a custom cookie check function.
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Debian | 12 | all | mbedtls | < 2.28.1-1 | mbedtls_2.28.1-1_all.deb |
Debian | 11 | all | mbedtls | <= 2.16.9-0.1 | mbedtls_2.16.9-0.1_all.deb |
Debian | 10 | all | mbedtls | < 2.16.9-0~deb10u1 | mbedtls_2.16.9-0~deb10u1_all.deb |
Debian | 999 | all | mbedtls | < 2.28.1-1 | mbedtls_2.28.1-1_all.deb |
Debian | 13 | all | mbedtls | < 2.28.1-1 | mbedtls_2.28.1-1_all.deb |