Mail server) via HTTP or a Common-Gateway Interface (CGI).
#Proxy websites 2014 code
“GNU Bash through 4.3 processes trailing strings after function definitions in the values of environment variables, which allows remote attackers to execute arbitrary code via a crafted environment, as demonstrated by vectors involving the ForceCommand feature in OpenSSH sshd, the mod_cgi and mod_cgid modules in the Apache HTTP Server, scripts executed by unspecified DHCP clients, and other situations in which setting the environment occurs across a privilege boundary from Bash execution,” states the description for the Bush Bug flaw on the NIST National Vulnerability Database, which rated its severity as 10 out of 10.Įvery machine having Bash configured as the default system shell could be easily hacked every time an application invokes the Bash shell command (e.g. Trailing code in the function definition will be executed.įigure 1 – Shellshock command diagram (Symantec)
#Proxy websites 2014 software
To run an arbitrary code on a system running software which embeds a Bash, it is necessary to assign a function to a variable. A threat actor could exploit it to execute shell commands remotely on a targeted machine using specifically crafted variables. The critical Bash Bug vulnerability, also dubbed Shellshock, affects versions GNU Bash versions ranging from 1.14 through 4.3. The National Institute of Standards and Technology has assigned the vulnerability the designation CVE-2014-6271, rating the severity of the remotely exploitable vulnerability as a “10” on its 10-point scale. “There are many, many examples of exploits out there already that could easily be fired off against a large volume of machines.” “The potential is enormous – ‘getting shell’ on a box has always been a major win for an attacker because of the control it offers them over the target environment,” said software architect and Microsoft MVP Troy Hunt.Īn attacker could dump all data stored on a server, change its settings, or serve malicious code to infect the machine. A shell gives both administrators and attackers high privileged access to operating system features, allowing them to run almost any command.
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