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Java/CVE-2010-0094


Java/CVE-2010-0094 is a family of malicious Java applets stored within a Java Archive (.JAR) that attempts to exploit a vulnerability in the Java Runtime Environment (JRE) up to and including version 6 update 18. The vulnerability allows an unsigned Java applet to gain elevated privileges and potentially have unrestricted access to a host system outside its "sandbox" environment. It is discussed in CVE-2010-0094.



What to do now

Update vulnerable applications

This threat exploits a known vulnerability in the Java Runtime Environment (JRE). To prevent your computer from being vulnerable to this malware, make sure that you install the updates available from the vendor. You can read more about this vulnerability from the following links:

It may be necessary to remove older versions of Java that are still present. Keeping old and unsupported versions of Java on your system presents a serious security risk. To read more about why you should remove older versions of Java, see the following information.

Threat behavior

Java/CVE-2010-0094 is a family of malicious Java applets stored within a Java Archive (.JAR) that attempts to exploit a vulnerability in the Java Runtime Environment (JRE) up to and including version 6 update 18. The vulnerability allows an unsigned Java applet to gain elevated privileges and potentially have unrestricted access to a host system outside its "sandbox" environment. It is discussed in CVE-2010-0094.

Installation

Java/CVE-2010-0094 is distributed using the Java Archive (JAR) file format. It has been observed in the wild that it arrives in the computer when users are tricked into visiting a webpage that hosts the malicious applet.

The JAR file contains classes and resources necessary to execute the exploit code implemented as a Java applet. Using remote method invocation (RMI), the main class exploits the vulnerability in the "RMIConnectionImpl" class by loading the serialized custom ClassLoader. The subclass of ClassLoader inherits a runtime permission which can call protected mode, enabling malicious classes to load in privileged context.

The JAR package consists of the following classes, which load during the exploit process:

  • Exploit or Main class
  • ClassLoader class
  • Payload class
Payload

Downloads arbitrary files
Java/CVE-2010-0094 variants are designed for drive-by download attacks, where an exploit is used for the purpose of downloading and executing arbitrary files, usually other malware.

Analysis by Methuselah Cebrian Ferrer


Symptoms

There are no common symptoms associated with this threat. Alert notifications from installed antivirus software may be the only symptoms.


Prevention

Update vulnerable applications

This threat exploits a known vulnerability in the Java Runtime Environment (JRE). To prevent your computer from being vulnerable to this malware, make sure that you install the updates available from the vendor. You can read more about this vulnerability from the following links:

Take the following steps to help prevent infection on your computer:
  • Enable a firewall on your computer.
  • Get the latest computer updates for all your installed software.
  • Use up-to-date antivirus software.
  • Limit user privileges on the computer.
  • Use caution when opening attachments and accepting file transfers.
  • Use caution when clicking on links to webpages.
  • Avoid downloading pirated software.
  • Protect yourself against social engineering attacks.
  • Use strong passwords.
Enable a firewall on your computer

Use a third-party firewall product or turn on the Microsoft Windows Internet Connection Firewall.

Get the latest computer updates

Updates help protect your computer from viruses, worms, and other threats as they are discovered. It is important to install updates for all the software that is installed in your computer. These are usually available from vendor websites. Instructions on how to download the latest versions of some common software is available from the following:

You can use the Automatic Updates feature in Windows to automatically download future Microsoft security updates while your computer is on and connected to the Internet.

Use up-to-date antivirus software

Most antivirus software can detect and prevent infection by known malicious software. To help protect you from infection, you should always run antivirus software, such as Microsoft Security Essentials, that is updated with the latest signature files. For more information, see http://www.microsoft.com/windows/antivirus-partners/.

Limit user privileges on the computer

Starting with Windows Vista and Windows 7, Microsoft introduced User Account Control (UAC), which, when enabled, allowed users to run with least user privileges. This scenario limits the possibility of attacks by malware and other threats that require administrative privileges to run.

You can configure UAC in your computer to meet your preferences:

Use caution when opening attachments and accepting file transfers

Exercise caution with email and attachments received from unknown sources, or received unexpectedly from known sources. Use extreme caution when accepting file transfers from known or unknown sources.

Use caution when clicking on links to webpages

Exercise caution with links to webpages that you receive from unknown sources, especially if the links are to a webpage that you are not familiar with, unsure of the destination of, or suspicious of. Malicious software may be installed in your computer simply by visiting a webpage with harmful content.

Avoid downloading pirated software

Threats may also be bundled with software and files that are available for download on various torrent sites. Downloading "cracked" or "pirated" software from these sites carries not only the risk of being infected with malware, but is also illegal. For more information, see 'The risks of obtaining and using pirated software'.

Protect yourself from social engineering attacks

While attackers may attempt to exploit vulnerabilities in hardware or software to compromise a computer, they also attempt to exploit vulnerabilities in human behavior to do the same. When an attacker attempts to take advantage of human behavior to persuade the affected user to perform an action of the attacker's choice, it is known as 'social engineering'. Essentially, social engineering is an attack against the human interface of the targeted computer. For more information, see 'What is social engineering?'.

Use strong passwords

Attackers may try to gain access to your Windows account by guessing your password. It is therefore important that you use a strong password – one that cannot be easily guessed by an attacker. A strong password is one that has at least eight characters, and combines letters, numbers, and symbols. For more information, see http://www.microsoft.com/protect/yourself/password/create.mspx.


Alert level: Severe
This entry was first published on: Jul 11, 2011
This entry was updated on: Jul 14, 2011

This threat is also detected as:
No known aliases