A multithreaded scanner for Citrix appliances that are vulnerable to CVE-2019-19781.
The scanner does not attempt to compromise/exploit hosts and avoids downloading any sensitive content. A HEAD request is used to determine if a target is vulnerable. False positives are reduced by verifying a specific value in the content-length header response.
citrixsmash_scanner is capable of accepting both network ranges and accepting individual hosts.
$ go get -u github.com/x1sec/citrixmash_scanner
Alternatively, compiled 64-bit executable files for Windows, Mac and Linux are available here
$ ./citrixsmash_scanner -h
-e Evade IDS with ASCII encoding (default true)
-f string
File containing list of hosts
-n string
Network in CIDR format (e.g. 192.168.0.0/24)
-o string
Write results to text file
-t int
HTTP timeout (seconds) (default 2)
-u string
Custom user agent string
-v Verbose
-w int
Number of concurrent workers (default 20)
Requests are concurrent with a default of 20 workers/threads. To speed up the scanning, increase workers (-w) and/or reduce the HTTP timeout (-t)
If either the -n or f parameters are omitted, citrixmash_scanner will accept input from stdin.
For example, using subdomain enumeration with assetfinder:
$ assetfinder corp.com | ./citrixmash_scanner
Targets can be mixed (http, https), and include networks in CIDR format. If http or https is ommitted, then https will be used. The following is a valid target list:
$ cat targets.txt
http://target1.com
https://target2.org
192.168.0.2
http://10.0.0.4
10.0.20.0/24
Use the -o <filename> option to write vulnerable hosts to a text file in addition to stdout
Options: verbose info (-v), 50 parallel workers (-w), 1 second timeout (-t), scanning subnet (-n) and also including hosts from target.txt (-f):
$ ./citrixmash_scanner -v -t 1 -w 50 -n 192.168.10.0/24 -f targets.txt
Citrix CVE-2019-19781 Scanner
Author: https://twitter.com/x1sec
Version: 0.4
[+] Testing 255 hosts with 20 concurrent workers ..
[!] https://192.168.10.5/ is vulnerable
[*] INFO: speed: 7 req/sec, sent: 106/255 reqs, vulnerable: 1
[!] https://10.10.0.8/ is vulnerable
[+] Done! 2 host(s) vulnerable
| version | date | changes |
|---|---|---|
| v0.4 | 16/01/20 | Accept targets from stdin, fixed exit issue with -v option, added -o option |
| v0.3 | 15/01/20 | Added evasion bypass (credit: Fireeye / @itsreallynick) |
| v0.2 | 13/01/20 | Check content-length of smb.conf to reduce false positives |
| v0.1 | 13/01/20 | Initial release |
Disclaimer: This tool is intended for legal activities such as penetration testing, bug bounty hunting on authorized assets and to help secure networks. The author holds no responsibility for it's use.