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Researchers on Thursday discovered a critical remotely exploitable vulnerability in the widely used command-line shell GNU Bourne Again Shell (Bash), dubbed "Shellshock" which affects most of the Linux distributions and servers worldwide, and may already have been exploited in the wild to take over Web servers as part of a botnet that is currently trying to infect other servers as well.

The Exploitation process relied upon a Java vulnerability (CVE-2013-2460) and after getting dropped into the target computer system, the malware detects the Java version installed on the operating system and based upon it requests the suitable exploit.

takes hold of computers by exploiting CVE-2013-2465, a critical Java vulnerability that Oracle patched in June. The security bug is present on Java 7 u21 and earlier. Once the bot has infected a computer, it copies itself to the autostart directory of its respective platform to ensure it runs whenever the machine is turned on. Compromised computers then report to an Internet relay chat channel that acts as a command and control server.

The botnet is designed to conduct distributed denial-of-service attacks on targets of the attackers' choice. Commands issued in the IRC channel allow the attackers to specify the IP address, port number, intensity, and duration of attacks.

According to internal NSA documents viewed by SPIEGEL, these on-call digital plumbers are involved in many sensitive operations conducted by American intelligence agencies. TAO's area of operations ranges from counterterrorism to cyber attacks to traditional espionage. The documents reveal just how diversified the tools at TAO's disposal have become -- and also how it exploits the technical weaknesses of the IT industry, from Microsoft to Cisco and Huawei, to carry out its discreet and efficient attacks. The unit is "akin to the wunderkind of the US intelligence community," says Matthew Aid, a historian who specializes in the history of the NSA. "Getting the ungettable" is the NSA's own description of its duties. "It is not about the quantity produced but the quality of intelligence that is important," one former TAO chief wrote, describing her work in a document. The paper seen by SPIEGEL quotes the former unit head stating that TAO has contributed "some of the most significant intelligence our country has ever seen." The unit, it goes on, has "access to our very hardest targets."

A code injection vulnerability in the Bourne again shell (Bash) has been disclosed on the internet. If exploited then arbitrary commands can be executed, and where Bash is used in relation to a network service, for example in CGI scripts on a web server, then the vulnerability will allow remote code execution.

Documents provided by NSA whistleblower Edward Snowden show that the government worked in secret to exploit a new internet surveillance law enacted in the wake of revelations of illegal domestic spying to initiate a new metadata collection program that appeared designed to collect information about the communications of New Zealanders.

Snowden explained that “at the NSA, I routinely came across the communications of New Zealanders in my work with a mass surveillance tool we share with GCSB, called ‘X KEYSCORE.”" He further detailed that “the GCSB provides mass surveillance data into XKEYSCORE. They also provide access to the communications of millions of New Zealanders to the NSA at facilities such as the GCSB facility in Waihopai, and the Prime Minister is personally aware of this fact.”