Vulnerability CVE-2017-3737: Information
Description
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.
Severity: MEDIUM (5.9) Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Fixed packages
Package name | Branch | Fixed in version | Version from repository | Errata ID | Task # | State |
|---|---|---|---|---|---|---|
| openssl10 | p9 | 1.0.2n-alt1 | 1.0.2u-alt1.p9.2 | ALT-PU-2017-2778-1 | 195951 | Fixed |
| openssl10 | p8 | 1.0.2n-alt0.M80P.1 | 1.0.2u-alt0.M80P.2 | ALT-PU-2017-2812-1 | 195953 | Fixed |
| openssl10 | c9f2 | 1.0.2n-alt1 | 1.0.2u-alt1.p9.1 | ALT-PU-2017-2778-1 | 195951 | Fixed |