bash - version number correction

An old attack vector has been corrected in bash, a sh-compatible
command language interpreter.

• CVE-2016-7543
  Specially crafted SHELLOPTS+PS4 environment variables in combination
  with insecure setuid binaries can result in root privilege
  escalation.

The setuid binary had to both use setuid() function call in
combination with a system() or popen() function call. With this
combination it is possible to gain root access.

I addition bash have to be the default shell (/bin/sh have to point
to bash) for the system to be vulnerable.

The default shell in Debian is dash and there are no known setuid
binaries in Debian with the, above described, insecure combination.

There could however be local software with the, above described,
insecure combination that could benefit from this correction.

For Debian 7 Wheezy, this problem have been fixed in version
4.2+dfsg-0.1+deb7u3.

We recommend that you upgrade your bash packages.

If there are local software that have the insecure combination and
do a setuid() to some other user than root, then the update will not
correct that problem. That problem have to be addressed in the
insecure setuid binary.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: <https://wiki.debian.org/LTS&gt;