Oval Definition:oval:com.ubuntu.artful:def:20173737000
Revision Date:2017-12-07Version:1
Title:CVE-2017-3737 on Ubuntu 17.10 (artful) - medium.
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.
Family:unixClass:vulnerability
Status:Reference(s):CVE-2017-3737
Platform(s):Ubuntu 17.10
Product(s):
Definition Synopsis
  • Ubuntu 17.10 (artful) is installed.
  • AND The 'openssl' package in artful was vulnerable but has been fixed (note: '1.0.2g-1ubuntu13.3').
  • BACK