Terrapin Attack

[Taglar Nirvana (Taglar)]

https://terrapin-attack.com/

https://github.com/RUB-NDS/Terrapin-Scanner

Hi,

in the last post i have had forget: Happy new year :)

I have tested 2 deliberately affected Alma Linux systems against the CVE with the git tool externally. The tests showed that the systems are affected.

In the vulnerability test with wazuh, however, this CVE(s) does not appear on either system. - Other CVE on the system where found, so the tests normaly works.

Why?

Regards,

Jürgen

[Harshal Paliwal]

Hi Team, Thanks for using Wazuh!

Can you please share more details about this like CVE details, ossec.conf, and what tests you have done deliberately to check the vulnerabilities?

Looking for your response soon!

[Taglar Nirvana (Taglar)]

Hi Harshal,

for more Details about the CVE see the two links.

The affected Systems are SSH on my Alma Linux 8 an 8.9:

   Static hostname: taglar.feste-ip.net
         Icon name: computer-laptop
           Chassis: laptop
  Operating System: AlmaLinux 8.9 (Midnight Oncilla)
       CPE OS Name: cpe:/o:almalinux:almalinux:8::baseos
            Kernel: Linux 4.18.0-477.15.1.el8_8.x86_64
      Architecture: x86-64

The Agent-Conf:

 cat /var/ossec/etc/ossec.conf
<!--
  Wazuh - Agent - Default configuration for almalinux 8.9
  More info at: https://documentation.wazuh.com
  Mailing list: https://groups.google.com/forum/#!forum/wazuh
-->

<ossec_config>
  <client>
    <server>
      <address>anonymouse.de</address>
      <port>1514</port>
      <protocol>tcp</protocol>
    </server>
    <config-profile>almalinux, almalinux8, almalinux8.9</config-profile>
    <notify_time>10</notify_time>
    <time-reconnect>60</time-reconnect>
    <auto_restart>yes</auto_restart>
    <crypto_method>aes</crypto_method>
    <enrollment>
      <enabled>yes</enabled>
      <agent_name>SF</agent_name>
      <groups>STARFACE</groups>
      <authorization_pass_path>etc/authd.pass</authorization_pass_path>
    </enrollment>
  </client>

  <client_buffer>
    <!-- Agent buffer options -->
    <disabled>no</disabled>
    <queue_size>5000</queue_size>
    <events_per_second>500</events_per_second>
  </client_buffer>

  <!-- Policy monitoring -->
  <rootcheck>
    <disabled>no</disabled>
    <check_files>yes</check_files>
    <check_trojans>yes</check_trojans>
    <check_dev>yes</check_dev>
    <check_sys>yes</check_sys>
    <check_pids>yes</check_pids>
    <check_ports>yes</check_ports>
    <check_if>yes</check_if>

    <!-- Frequency that rootcheck is executed - every 12 hours -->
    <frequency>43200</frequency>

    <rootkit_files>etc/shared/rootkit_files.txt</rootkit_files>
    <rootkit_trojans>etc/shared/rootkit_trojans.txt</rootkit_trojans>

    <skip_nfs>yes</skip_nfs>
  </rootcheck>

  <wodle name="cis-cat">
    <disabled>no</disabled>
    <timeout>1800</timeout>
    <interval>1d</interval>
    <scan-on-start>yes</scan-on-start>

    <java_path>wodles/java</java_path>
    <ciscat_path>wodles/ciscat</ciscat_path>
  </wodle>

  <!-- Osquery integration -->
  <wodle name="osquery">
    <disabled>yes</disabled>
    <run_daemon>yes</run_daemon>
    <log_path>/var/log/osquery/osqueryd.results.log</log_path>
    <config_path>/etc/osquery/osquery.conf</config_path>
    <add_labels>yes</add_labels>
  </wodle>

  <!-- System inventory -->
  <wodle name="syscollector">
    <disabled>no</disabled>
    <interval>1h</interval>
    <scan_on_start>yes</scan_on_start>
    <hardware>yes</hardware>
    <os>yes</os>
    <network>yes</network>
    <packages>yes</packages>
    <hotfixes>yes</hotfixes>
    <ports all="no">yes</ports>
    <processes>yes</processes>

    <!-- Database synchronization settings -->
    <synchronization>
      <max_eps>10</max_eps>
    </synchronization>
  </wodle>

  <sca>
    <enabled>yes</enabled>
    <scan_on_start>yes</scan_on_start>
    <interval>12h</interval>
    <skip_nfs>yes</skip_nfs>
  </sca>

  <!-- File integrity monitoring -->
  <syscheck>
    <disabled>no</disabled>

    <!-- Frequency that syscheck is executed default every 12 hours -->
    <frequency>43200</frequency>

    <scan_on_start>yes</scan_on_start>

    <!-- Directories to check  (perform all possible verifications) -->
    <directories>/etc,/usr/bin,/usr/sbin</directories>
    <directories>/bin,/sbin,/boot</directories>

    <!-- Files/directories to ignore -->
    <ignore>/etc/mtab</ignore>
    <ignore>/etc/hosts.deny</ignore>
    <ignore>/etc/mail/statistics</ignore>
    <ignore>/etc/random-seed</ignore>
    <ignore>/etc/random.seed</ignore>
    <ignore>/etc/adjtime</ignore>
    <ignore>/etc/httpd/logs</ignore>
    <ignore>/etc/utmpx</ignore>
    <ignore>/etc/wtmpx</ignore>
    <ignore>/etc/cups/certs</ignore>
    <ignore>/etc/dumpdates</ignore>
    <ignore>/etc/svc/volatile</ignore>

    <!-- File types to ignore -->
    <ignore type="sregex">.log$|.swp$</ignore>

    <!-- Check the file, but never compute the diff -->
    <nodiff>/etc/ssl/private.key</nodiff>

    <skip_nfs>yes</skip_nfs>
    <skip_dev>yes</skip_dev>
    <skip_proc>yes</skip_proc>
    <skip_sys>yes</skip_sys>

    <!-- Nice value for Syscheck process -->
    <process_priority>10</process_priority>

    <!-- Maximum output throughput -->
    <max_eps>50</max_eps>

    <!-- Database synchronization settings -->
    <synchronization>
      <enabled>yes</enabled>
      <interval>5m</interval>
      <max_eps>10</max_eps>
    </synchronization>
  </syscheck>

  <!-- Log analysis -->
  <localfile>
    <log_format>command</log_format>
    <command>df -P</command>
    <frequency>360</frequency>
  </localfile>

  <localfile>
    <log_format>full_command</log_format>
    <command>netstat -tulpn | sed 's/\([[:alnum:]]\+\)\ \+[[:digit:]]\+\ \+[[:digit:]]\+\ \+\(.*\):\([[:digit:]]*\)\ \+\([0-9\.\:\*]\+\).\+\ \([[:digit:]]*\/[[:alnum:]\-]*\).*/\1 \2 == \3 == \4 \5/' | sort -k 4 -g | sed 's/ == \(.*\) ==/:\1/' | sed 1,2d</command>
    <alias>netstat listening ports</alias>
    <frequency>360</frequency>
  </localfile>

  <localfile>
    <log_format>full_command</log_format>
    <command>last -n 20</command>
    <frequency>360</frequency>
  </localfile>

  <!-- Active response -->
  <active-response>
    <disabled>no</disabled>
    <ca_store>etc/wpk_root.pem</ca_store>
    <ca_verification>yes</ca_verification>
  </active-response>

  <!-- Choose between "plain", "json", or "plain,json" for the format of internal logs -->
  <logging>
    <log_format>plain</log_format>
  </logging>

</ossec_config>

<ossec_config>
  <localfile>
    <log_format>audit</log_format>
    <location>/var/log/audit/audit.log</location>
  </localfile>

  <localfile>
    <log_format>syslog</log_format>
    <location>/var/ossec/logs/active-responses.log</location>
  </localfile>

  <localfile>
    <log_format>syslog</log_format>
    <location>/var/log/messages</location>
  </localfile>

  <localfile>
    <log_format>syslog</log_format>
    <location>/var/log/secure</location>
  </localfile>

  <localfile>
    <log_format>syslog</log_format>
    <location>/var/log/maillog</location>
  </localfile>

</ossec_config>

Regards,

Jürgen