Add Debian and Ubuntu 18 support in vulnerability-detector

[crolopez]

This feature adds vulnerability scanner support for:

• Debian 9 Stretch
• Debian 8 Jessie
• Debian 7 Wheezy
• Ubuntu 18 Bionic

Example

    <feed name="debian-9">
        <disabled>no</disabled>
        <update_interval>1h</update_interval>
    </feed>

    <feed name="ubuntu-18">
        <disabled>no</disabled>
        <update_interval>1h</update_interval>
    </feed>

Status

• This PR must be accepted before Extracts CVE codes instead of RHSA codes into vulnerability-detector #549.

[albertomn86]

Using the following configuration:

<wodle name="vulnerability-detector">
    <disabled>no</disabled>
    <interval>1m</interval>
    <run_on_start>yes</run_on_start>
    <feed name="ubuntu-16">
        <disabled>no</disabled>
        <allow>ubuntu 17, ubuntu 18</allow>
        <update_interval>1h</update_interval>
    </feed>
    <feed name="redhat-7">
        <disabled>no</disabled>
        <allow>centos 7</allow>
        <update_interval>1h</update_interval>
    </feed>
    <feed name="debian-9">
        <disabled>no</disabled>
        <update_interval>1h</update_interval>
    </feed>
</wodle>

I've received these messages:

2018/05/07 17:37:57 wazuh-modulesd:vulnerability-detector: DEBUG: (5464): Ubuntu version not supported (agent ubuntu1710).
2018/05/07 17:37:57 wazuh-modulesd:vulnerability-detector: DEBUG: (5463): Agent redhat7 has an unsupported Wazuh version.

I've also received this segfault:

{"timestamp":"2018-05-07T17:09:22.248-0700","rule":{"level":5,"description":"Process segfaulted.","id":"1010","firedtimes":2,"mail":false,"groups":["syslog","errors","service_availability"]},"agent":{"id":"000","name":"ubuntu1710"},"manager":{"name":"ubuntu1710"},"id":"1525738162.482872","full_log":"May  7 17:09:21 ubuntu1710 kernel: [19343.370702] wazuh-modulesd[34534]: segfault at 0 ip 00007fb048612af4 sp 00007fb047266c60 error 4 in libc-2.26.so[7fb04857d000+1d6000]","predecoder":{"program_name":"kernel","timestamp":"May  7 17:09:21","hostname":"ubuntu1710"},"decoder":{"name":"kernel"},"location":"/var/log/kern.log"}

[albertomn86]

Compilation warning

[albertomn86]

wazuh_modules/wm_vuln_detector.c:2587:22: warning: ‘agent_dist’ may be used uninitialized in this function [-Wmaybe-uninitialized]
         agents->dist = agent_dist;