Exploiting Node.js deserialization bug for Remote Code Execution. February 8, 2017; Blog; tl;dr. Untrusted data passed into unserialize() function in node-serialize module can be exploited to achieve arbitrary code execution by passing a serialized JavaScript Object with an Immediately invoked function expression (IIFE). Exploiting Node.js deserialization bug for Remote Code Execution. February 8, 2017; Blog; tl;dr. Untrusted data passed into unserialize() function in node-serialize module can be exploited to achieve arbitrary code execution by passing a serialized JavaScript Object with an Immediately invoked function expression (IIFE). During a Node.js code review, I happen to see a serialization.
NodeJS Module for working with PHP serialized data. In the most basic form, simply pass primitives, objects or arrays into the serialize method. The value to be serialized. Serialize() handles all types, except the resource-type.You can even serialize() arrays that contain references to itself. Circular references inside the array/object you are serializing will also be stored. JavaScript tool to unserialize data taken from PHP. It can parse 'serialize()' output, or even serialized sessions data. Skip to content. Features Business. Join GitHub today. Install from npm: npm install php-unserialize. The use it the usual way.
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I am having problems with transactions using node.js and mysql. The problem is that my transactions do not run in isolation, even if I set the isolation level to 'serializable'.
I set up the following minimal example to exemplify my problem. I am using a single table with two collumns (id, val):
Note that I am unsing InnoDB table type because it supports transactions.
Node Js Php Unserialize
My node.js program just reads the value from the single row in table A, and increments it using an update statement. The select statement uses the FOR UPDATE modifier to obtain a lock on the row. The two sql statement are wrapped into a transaction, and I execute 10 of these transactions in a for loop:
I would expect that after running this code, the value stored in the table A is incremented by 10. However, it is just incremented by 1.
To understand what's going on I added printouts to the code. I would expect to see printouts
Clinical hematology atlas pdf. However I get the printouts
One way to fix the problem is to establish a new db connection for each transaction, but I'd prefer not to do that for performance reasons.
Can someone explain what is going on, and how I can change the above into a working example for transactions in node.js?
ClemensClemens
1 Answer
Goddess sekhmet pictures. Ok, we found a solution using the node-mysql-transaction package (see code below).
ClemensClemens
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JavaScript tool to unserialize data taken from PHP. It can parse 'serialize()' output, or even serialized sessions data.
![Serialized Serialized](/uploads/1/3/3/9/133908333/407222350.jpg)
Credits
- The PHP unserializer is taken from kvz's phpjs project.
- The session unserializer's idea is taken from dumpling, which is highly limited by its lack of a real unserializer, and has lot of crash cases.
Installation
Node.js
Install from npm :
The use it the usual way :
Browser
Download tarball from github and then unarchive this where you want, then you can simply include it in your page :
Compatibility issues
Node Js Tutorials
This library has been tested server-side only. For example it uses
[].reduce
, so it may not work on some browsers. Do not hesitate to make pull requests to fix it for you favorite browsers :)Notes
- Note that
array()
will be converted to{}
and not[]
. That can be discussed asarray()
in PHP has various significations. A choice had to be done, but it may change in the future (cf. next point). - A less obvious conversion is
array('a', 'b')
which will be converted to{'0': 'a', '1': 'b'}
. Quite annoying, and it will be fixed if necessary (this means I won't work on this issue unless you really need it, but I agree this is not normal behavior).
Usage
Php Vs Node Js
The module exposes two methods:
unserialize(string)
Node Js Commands
Unserialize output taken from PHP's
serialize()
method.Node Js Web Server Example
It currently does not suport objects.
unserializeSession(string)
Unserialize PHP serialized session. PHP uses a weird custom format to serialize session data, something like '
$key1$serializedData1|$key2$serializedData2|…
', this methods will parse this and unserialize chunks so you can have a simple anonymous objects.