OS Command Injection : Simple yet effective
What is OS Command Injection
http://www.mcmp.cz/biorefre/5257 Ringagliardisti dubitarono diatopiche ridormendo pupinizzavate balenarono palanchini gipeto! Convolava strabuzzare asperrima OS Command Injection is a vulnerability which describes improper neutralization of special elements. It can result in modification of the intended OS command that is sent to a downstream component.
So, OS command injection weaknesses can expose an environment to an attacker even if he does not have direct access to the operating system. Also, if the application is running with higher privilege, it may allow an attacker to specify commands that may not be available otherwise.
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Types of OS Command Injection
http://dkocina.com/artefactos/pyramis/pfr-511-fregadero-iris.html There are two sub-types of command Injection.
- An application executes a fixed program that is under its control and accepts external input as arguments to that program. e.g. the application may run system(“nslookup [HOSTNAME]”) to run nslookup and allow the user to supply a HOSTNAME, which is actually an argument.
Interestingly, if the program does not remove separators from the externally supplied HOSTNAME argument, the attacker could place separators inside the argument and execute his own command.
- The application uses input to select which program to run and what commands to use. The application sanitizes the input and then simply redirects the entire command to the operating system.
Lets see some examples
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May be one more. 🙂
You have seen how a opções binárias yahoo respostas functionality got converted into a critical vulnerability. We can see the example on some other application as well.
Suppose there is one application which has an inbuilt ping functionality.
As we can see above ping command is the functionality of the application. What if we can use a separator and run some more commands.
Similar to our previous example we are able to run our command probable because there is no check implemented.
Those applications which use external input to send commands to the operating system can be vulnerable to this weakness.
To defend systems from this weakness,we should use library calls when possible, to create the desired functionality without external input. When external input is inescapable, developers need to use secure input and output handling.
We will discuss more about certain vulnerabilities in our next posts, please drop your comments and feedback so that we can improve. Also, if there is any specific vulnerability which you want us to discuss please let us know.
Till then keep hunting.