OpenSSL 1.0.2 (starting from version 1.0.2b) introduced an "error state" mechanism. The intent was that if a fatal error occurred during a handshake then OpenSSL would move into the error state and would immediately fail if you attempted to continue the handshake. This works as designed for the explicit handshake functions (SSL_do_handshake(), SSL_accept() and SSL_connect()), however due to a bug it does not work correctly if SSL_read() or SSL_write() is called directly. In that scenario, if the handshake fails then a fatal error will be returned in the initial function call. If SSL_read()/SSL_write() is subsequently called by the application for the same SSL object then it will succeed and the data is passed without being decrypted/encrypted directly from the SSL/TLS record layer. In order to exploit this issue an application bug would have to be present that resulted in a call to SSL_read()/SSL_write() being issued after having already received a fatal error. OpenSSL version 1.0.2b-1.0.2m are affected. Fixed in OpenSSL 1.0.2n. OpenSSL 1.1.0 is not affected.
| Vendor | Product | Versions |
|---|---|---|
| Alpine:v3.6 | openssl | 0, *, * |
| Alpine:v3.8 | openssl | *, 0, 0.9.8i-r0 |
| Alpine:v3.5 | openssl | 1.0.2a-r0, 1.0.2a-r1, 1.0.2b-r0 |
| Alpine:v3.7 | openssl | 1.0.2b-r0, 0, 0.9.8i-r0 |
| Alpine:v3.3 | openssl | 1.0.1b-r0, 1.0.1g-r2, 1.0.1g-r3 |
| Alpine:v3.4 | openssl | 1.0.1f-r0, 1.0.1g-r0, 1.0.1g-r1 |