Log4j-Scanner with Bind-Receipt and custom hostnames

Related tags

Security related resourceshrafna
Overview

Hrafna - Log4j-Scanner for the masses

Features

  • Scanning-system designed to check your own infra for vulnerable log4j-installations
  • start and stop scans ([CTRL-C] is your friend), continue and skip already tested
  • use your own DNS-server that listens to Requests from scanned hosts
  • unique requests for each host to be scanned
  • easy to correlate which host sends a callback
  • reportmode to see which hosts made a callback

unique requests

  • each payload is unique, so you can see which host triggered a response or maybe backend-system were connected

PAYLOAD: e3a4d77618a0  .  3c028d   .  l4s.scanix.edu
         ^^^              ^^^         ^^^
         host_id          scan_id     your custom nameserver

img

install

  • install packages from requirements.txt
  • instructions for the BIND-setup are below

config

  • l4s.scanix.edu is our example here, change according to your own needs

  • global_config


global.yaml

base_scan_domain: l4s.scanix.edu
bind_log: /var/log/bind/hrafna.log
  • each scan has a unique config-file in yaml-format

scan.yaml

name: your_scan_name
mode: default
input_file: hostnames.txt

#
  • name: give your scan a name (alphanum, spaces will get converted to "_"
  • mode:
    • default 8currently the only mode, but more will get added as new attackvectors are dropping in, "vmware" is already in testing
  • input_file: your file with targets (IPs or hostnames), full urls including ports preferred, otherwise only https://target/ is checked

optional:


# waf_bypass: True | False (tbd)
# headers: headers.txt (tbd) which headers_file to use, must be available in libs/

run


./hrafna scan scan.yaml    -> execute/continue a scan, requests
                              are stored in output/scan_name/global.log

./hrafna report scan.yaml  -> check sended request against
                              your BIND-log (see global.log)

./hrafna reset scan.yaml   -> copy a scan to output/scan_name.TIMESTAMP
                              allows you to execute another scan

Setup the scanner and BIND

  • have your dns-server and your scanner on the same maschine for auto_reports (scanner neesd to read the bind-logfile)

your bind config

  • GOTO DNS-Zonefile

  • lcoal named.conf


# named.conf.local

...


zone "l4s.scanix.edu." {
        type master;
        file "/etc/bind/l4s.zone";
};

logging {
  channel "querylog" {
    file "/var/log/bind9/hrafna.log";
    print-time yes;
  };
  category queries { querylog; };
};

...
  • bind_zonefile - change l4s.scanix.edu to your own domain / subdomain

# /etc/bind/l4s.zone

; l4s.scanix.edu
$TTL 60
l4s.scanix.edu. IN     SOA    a.root-servers.net. [email protected]. (
                                2021121301  ; Serial
                                1H          ; refresh after 3 hours
                                30m          ; retry after 1 hour
                                1H          ; expire after 1 week
                                1D)         ; minimum TTL of 1 day

                                IN      NS      l4s.scanix.edu.


l4s.scanix.edu.                  IN A            1.2.3.4
l4s.scanix.edu.                  IN AAAA         2a01:4f8::::

*                               IN A            1.2.3.4           
*                               IN AAAA         2a01:4f8:::::
Owner
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