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.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2017-3737 from the MITRE CVE dictionary dictionary and NIST NVD.
CVSS3 Base Score | 5.9 |
---|---|
CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
Attack Vector | Network |
Attack Complexity | High |
Privileges Required | None |
User Interaction | None |
Scope | Unchanged |
Confidentiality | High |
Integrity Impact | None |
Availability Impact | None |
Platform | Errata | Release Date |
---|---|---|
Red Hat JBoss Core Services on RHEL 7 Server | RHSA-2018:2185 | 2018-07-12 |
Red Hat Enterprise Linux 7 (openssl) | RHSA-2018:0998 | 2018-04-10 |
Red Hat JBoss Core Services 1 | RHSA-2018:2187 | 2018-07-12 |
Red Hat JBoss Core Services on RHEL 6 Server | RHSA-2018:2186 | 2018-07-12 |
Platform | Package | State |
---|---|---|
Red Hat JBoss Web Server 3.0 | openssl | Not affected |
Red Hat JBoss Web Server 3 | openssl | Will not fix |
Red Hat JBoss EWS 2 | openssl | Will not fix |
Red Hat JBoss EAP 6 | openssl | Will not fix |
Red Hat JBoss EAP 5 | openssl | Not affected |
Red Hat Enterprise Linux 7 | openssl098e | Not affected |
Red Hat Enterprise Linux 7 | OVMF | Not affected |
Red Hat Enterprise Linux 6 | openssl | Not affected |
Red Hat Enterprise Linux 6 | openssl098e | Not affected |
Red Hat Enterprise Linux 5 | openssl097a | Not affected |
Red Hat Enterprise Linux 5 | openssl | Not affected |
RHEV Manager 3 | mingw-virt-viewer | Not affected |