YASUO - Scans for Vulnerable & Exploitable 3rd-party Web Applications

Friday, May 29, 2015

Yasuo is a ruby script that scans for vulnerable 3rd-party web applications.

While working on a network security assessment (internal, external, redteam gigs etc.), we often come across vulnerable 3rd-party web applications or web front-ends that allow us to compromise the remote server by exploiting publicly known vulnerabilities. Some of the common & favorite applications are Apache Tomcat administrative interface, JBoss jmx-console, Hudson Jenkins and so on.

If you search through Exploit-db, there are over 10,000 remotely exploitable vulnerabilities that exist in tons of web applications/front-ends and could allow an attacker to completely compromise the back-end server. These vulnerabilities range from RCE to malicious file uploads to SQL injection to RFI/LFI etc.

Yasuo is built to quickly scan the network for such vulnerable applications thus serving pwnable targets on a silver platter.

Setup / Install

You would need to install the following gems:
gem install ruby-nmap net-http-persistent mechanize colorize text-table


Yasuo provides following command-line options:
-r :: If you want Yasuo to perform port scan, use this switch to provide an IP address or IP range or an input file with new-line separated IP addresses
-s :: Provide custom signature file. [./yasuo.rb -s mysignatures.yaml -f nmap.xml] [Default - signatures.yaml]
-f :: If you do not want Yasuo to perform port scan and already have an nmap output in xml format, use this switch to feed the nmap output
-n :: Tells Yasuo to not ping the host while performing the port scan. Standard nmap option.
-p :: Use this switch to provide port number(s)/range
-A :: Use this switch to scan all the 65535 ports. Standard nmap option.
-b [all/form/basic] :: If the discovered application implements authentication, use this switch to brute-force the auth. "all" will brute-force both form & http basic auth. "form" will only brute-force form-based auth. "basic" will only brute-force http basic auth.
-t :: Specify maximum number of threads
-h :: Well, take a guess


./yasuo -r -p 80,8080,443,8443 -b form
The above command will perform port scan against on ports 80, 8080, 443 and 8443 and will brute-force login for all the applications that implement form-based authentication.
./yasuo -f my_nmap_output.xml -b all
The above command will parse the nmap output file "my_nmap_output.xml" and will brute-force login for all the applications that implement form-based and http basic authentication.

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