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CVE-2017-3737
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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.
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CVSS V3 Severity and Metrics
General Information
Vendors
- debian,
- openssl
Products
- debian linux 9.0,
- openssl 1.0.2b,
- openssl 1.0.2c,
- openssl 1.0.2d,
- openssl 1.0.2e,
- openssl 1.0.2f,
- openssl 1.0.2g,
- openssl 1.0.2h,
- openssl 1.0.2i,
- openssl 1.0.2j,
- openssl 1.0.2k,
- openssl 1.0.2l,
- openssl 1.0.2m
References
Advisory
