This vulnerability, which is found existing in certain versions of GNU Bourne Again Shell (Bash) can allow an attacker to execute commands on an affected system. It allows for remote code execution on servers that run these Linux distributions. Bash is used by most Unix and Linux systems, as well as OS X. This vulnerability was reportedly being exploited in the wild already. Trend Micro spotted samples, which are actual payload of the said exploit code. Trend Micro detects this as ELF_BASHLITE.A.
All versions of Bash up to and including version 4.3 are vulnerable.
Trend Micro Deep Discovery protects network connections via the following rule:
Trend Micro Deep Discovery also has the following DDI rule:
Trend Micro Deep Security protects users from this threat via the following update (DSRU14-028) and rule: