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
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:::::
102 Dec 18, 2022
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