It was found that the GnuTLS implementation of HMAC-SHA-256 was vulnerable to a Lucky thirteen style attack. Remote attackers could use this flaw to conduct distinguishing attacks and plaintext-recovery attacks via statistical analysis of timing data using crafted packets.
{
    "binaries": [
        {
            "binary_name": "gnutls-bin",
            "binary_version": "3.0.11+really2.12.23-12ubuntu2.8"
        },
        {
            "binary_name": "libgnutls-dev",
            "binary_version": "2.12.23-12ubuntu2.8"
        },
        {
            "binary_name": "libgnutls-openssl27",
            "binary_version": "2.12.23-12ubuntu2.8"
        },
        {
            "binary_name": "libgnutls26",
            "binary_version": "2.12.23-12ubuntu2.8"
        },
        {
            "binary_name": "libgnutlsxx27",
            "binary_version": "2.12.23-12ubuntu2.8"
        }
    ]
}
          {
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "gnutls-bin",
            "binary_version": "3.4.10-4ubuntu1.5"
        },
        {
            "binary_name": "guile-gnutls",
            "binary_version": "3.4.10-4ubuntu1.5"
        },
        {
            "binary_name": "libgnutls-dev",
            "binary_version": "3.4.10-4ubuntu1.5"
        },
        {
            "binary_name": "libgnutls-openssl27",
            "binary_version": "3.4.10-4ubuntu1.5"
        },
        {
            "binary_name": "libgnutls28-dev",
            "binary_version": "3.4.10-4ubuntu1.5"
        },
        {
            "binary_name": "libgnutls30",
            "binary_version": "3.4.10-4ubuntu1.5"
        },
        {
            "binary_name": "libgnutlsxx28",
            "binary_version": "3.4.10-4ubuntu1.5"
        }
    ]
}
          {
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "gnutls-bin",
            "binary_version": "3.5.18-1ubuntu1.1"
        },
        {
            "binary_name": "libgnutls-dane0",
            "binary_version": "3.5.18-1ubuntu1.1"
        },
        {
            "binary_name": "libgnutls-openssl27",
            "binary_version": "3.5.18-1ubuntu1.1"
        },
        {
            "binary_name": "libgnutls28-dev",
            "binary_version": "3.5.18-1ubuntu1.1"
        },
        {
            "binary_name": "libgnutls30",
            "binary_version": "3.5.18-1ubuntu1.1"
        },
        {
            "binary_name": "libgnutlsxx28",
            "binary_version": "3.5.18-1ubuntu1.1"
        }
    ]
}
          {
    "binaries": [
        {
            "binary_name": "gnutls-bin",
            "binary_version": "3.8.3-1.1ubuntu3.4+Fips1.1"
        },
        {
            "binary_name": "libgnutls-dane0t64",
            "binary_version": "3.8.3-1.1ubuntu3.4+Fips1.1"
        },
        {
            "binary_name": "libgnutls-openssl27t64",
            "binary_version": "3.8.3-1.1ubuntu3.4+Fips1.1"
        },
        {
            "binary_name": "libgnutls28-dev",
            "binary_version": "3.8.3-1.1ubuntu3.4+Fips1.1"
        },
        {
            "binary_name": "libgnutls30t64",
            "binary_version": "3.8.3-1.1ubuntu3.4+Fips1.1"
        }
    ]
}