Tuesday, March 14, 2017
f there was a human possibility to calculate the elliptic curve on an infinite random geo space...we, would have God's encryption
MESSIAH CODE PART II
What is the strict aliasing rule?
...
Before strict aliasing was introduced, the compiler had to live in a state of paranoia that the contents of
buff
could change at anytime from anywhere by anybody. So to get an extra performance edge, and assuming most people don't type-pun pointers, the strict aliasing rule was introduced.
Keep in mind, if you think the example is contrived, this might even happen if you're passing a buffer to another function doing the sending for you, if instead you have.
void SendMessage(uint32_t* buff, size_t size32)
{
for (int i = 0; i < size32; ++i)
{
SendWord(buff[i]);
}
}
And rewrote our earlier loop to take advantage of this convenient function
for (int i =0; i < 10; ++i)
{
msg->a = i;
msg->b = i+1;
SendMessage(buff, 2);
}
Monday, March 13, 2017
Sunday, March 12, 2017
MooTools ...I like this Trojan Builder for the Messiah code
MooTools uses a Class called Request.
// create a new Class instance
var myRequest = new Request({
url: 'getMyText.php',
method: 'get',
onRequest: function(){
myElement.set('text', 'loading...');
},
onSuccess: function(responseText){
myElement.set('text', responseText);
},
onFailure: function(){
myElement.set('text', 'Sorry, your request failed :(');
}
});
// and to send it:
myRequest.send(data);
Joomla Extension Attacks
Our web honeypots picked up some increased exploit attempts for an old Joomla Content Editor (JCE) Extension vulnerability.
Although this vulnerability is a few years old, botnet owners are heavily scanning for sites that are vulnerable and attempting to exploit them.
Exploit Details
Here are the exploit details from the vulnerability write-up on Exploit-DB:
Web Honeypot Logs - Attack Sequence
Step 1: Attempt to Upload a PHP Webshell
The first step in this attack is to attempt to upload a webshell/backdoor file to the JCE ImageManager. Here is how the attack looked in the default Apache access_log file:
This entry shows a POST request to the ImageManager Joomla Plugin using the "com_jce" option. We can also see a tell-tale sign of a malicious program in the User-Agent string value "BOT for JCE". Unfortunately, the default Apache access_log does not actually log the critical POST payload for this request so we can not see what was sent. Fortunately, we also have our ModSecurity WAF installed so we can go to the detailed audit log file to see the complete transaction. Here is the same transaction as logged by ModSecurity:
We notice a few things here:
- Under Section "B" - We can see the POST request is "MultiPart" meaning that it is an attempt to upload a file attachment.
- Under Section "J" - we can see the meta-data about the file attachment. It was a file called "food.gif".
- Under Section "H" - we see two different rules triggered on this request. One for a missing Accept request header and one from our commercial ModSecurity rules package for the suspicious User-Agent value.
File Attachment Analysis
ModSecurity has the ability to capture and store file attachments. When we inspect the "food.gif" file, we find the following:
This is an obfuscated PHP file. After decoding, we find this section of code:
This is a typical webshell/backdoor that allows the attacker to submit OS commands and upload files:
Step 2: Rename File Extension
After uploading the webshell file, the attacker next needs to rename the file and change the file extension from ".gif" to ".php" so that it will be executed as code by the application. There are known exploit tools to achieve this task. Here is an example screenshot of a PHP exploit page:
The source code of the page shows the attack details:
The highlighted section show the JSON request body content that uses the "folderRename" action to change the uploaded file extension. This is how the actual attack attempt looked in the ModSecurity audit log file:
Note under Section H that our commercial rule captured this attack attempt.
Step 3: Access the Webshell
The last step in the attack sequence was for the attacker to try and access the webshell file:
Subscribe to:
Comments (Atom)