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Java/CVE-2013-0422


Exploit:Java/CVE-2013-0422 is a malicious Java applet that attempts to exploit a vulnerability (CVE-2013-0422) in the Java Runtime Environment (JRE), in order to download and install files of an attacker’s choice onto your computer.

If you visit a website containing the malicious code while using a vulnerable version of Java, the exploit is loaded. Note, however, that a number of legitimate websites could be compromised or unwillingly host a malicious applet through advertising frames which could redirect to or host a malicious Java applet.

Update vulnerable Java applications

This threat exploits a known vulnerability in Java. After removing this threat, make sure that you install the updates available from the vendor. You can read more about this vulnerability in Java, as well as where to download the software update 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.



What to do now

To detect and remove this threat and other malicious software that may be installed on your computer, run a full-system scan with an appropriate, up-to-date, security solution. The following Microsoft products detect and remove this threat:

Update vulnerable Java applications

This threat exploits a known vulnerability in Java. After removing this threat, make sure that you install the updates available from the vendor. You can read more about this vulnerability in Java, as well as where to download the software update 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

Exploit:Java/CVE-2013-0422 is a malicious Java applet that attempts to exploit a vulnerability (CVE-2013-0422) in Oracle JRE 7.

If you visit a website containing the malicious code while using a vulnerable version of Java, the exploit is loaded. It then attempts to download and execute files from a remote host/URL; the files that are downloaded and executed could include additional malware.

The first malware to exploit this vulnerability was found in December 2012 in the wild, and publicly disclosed in January 2013. It is exploiting a package restriction issue in JRE(Java Runtime Environment). The malware uses a typical Java exploitation technique by loading its malicious payload class in a trusted code area, which makes privilege escalation possible. The payload can be embedded in the JAR (Java Archive) file, or it may be downloaded from the Internet. The payload can be any kind of malware that the attacker wants to deliver to your computer.

Analysis by Jeong Wook (Matt) Oh


Symptoms

If this detection is reported then it is likely that your computer has been compromised beyond this single infection. Your antivirus solution may soon begin to report other malware detections as new malicious files are downloaded and executed on your computer.

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


Prevention

Update vulnerable Java applications

This threat exploits a known vulnerability in Java. To prevent your computer from being affected by this threat, make sure that you install the updates available from the vendor. You can read more about this vulnerability in Java, as well as where to download the software update 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 'Consumer security software providers'.

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.

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 'Create strong passwords'.


Alert level: Severe
This entry was first published on: Jan 11, 2013
This entry was updated on: Feb 05, 2013

This threat is also detected as:
No known aliases