Prevent SSL CRIME

    The CRIME (Compression Ratio Info-leak Made Easy) attack is a vulnerability in the SSL compression. The attack against secret web cookies sent over compressed HTTPS or SPDY connections, leaves cookie data vulnerable to session hijacking.

    Security Assessment

    Security_Assessment_PreventSSLCRIME

    CVSS Vector: AV:N/AC:H/AU:N/C:P/I:N/A:N

    Vulnerability Information

    The CRIME (Compression Ratio Info-leak Made Easy) attack is a vulnerability in the SSL compression. The attack against secret web cookies sent over compressed HTTPS or SPDY connections, leaves cookie data vulnerable to session hijacking.

    Guides

    To prevent the CRIME attack, disable SSL compression.

    Apache

    Using the standard settings, CRIME is only a problem for Apache version 2.4.3. To disable SSL compression, define the following directive in your SSL settings (usually /etc/apache2/mods-enabled/ssl.confor /etc/letsencrypt/options-ssl-apache.conf when using Let's Encrypt). Also strongly think of upgrading Apache to the latest version.

    sslcrime

    https://github.com/crashtest-security/gist/blob/master/ssl_tls_vulnerabilities/ssl_crime/apache

    Nginx

    Nginx is vulnerable for CRIME in older versions, which have SSL compression enabled. Please update to a recent version of nginx and OpenSSL. The following versions are known to prevent the vulnerability:

    • 1.0.9 (if OpenSSL 1.0.0+ used)
    • 1.1.6 (if OpenSSL 1.0.0+ used)
    • 1.2.2
    • 1.3.2
    sslcrime (1)

    https://github.com/crashtest-security/gist/blob/master/ssl_tls_vulnerabilities/ssl_crime/nginx

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