bash velnerability

[Bryan Drewery]

On 9/25/2014 11:13 AM, Jung-uk Kim wrote:
> On 2014-09-25 02:54:06 -0400, Koichiro Iwao wrote:
>> Please let me make corrections.  The "shellshock" bash 
>> vulnerabilities are described by 2 CVEs. - CVE-2014-6271 - 
>> CVE-2014-7169
>>
>> The first CVE is already fixed in latest freebsd ports tree 
>> (r369185), so far the second CVE is not fixed yet.
> 
> CVE-2014-7169 is fixed now (r369261).
> 
> http://svnweb.freebsd.org/changeset/ports/369261
> 
> Note the commit log says CVE-2014-3659 but it was actually reassigned
> as CVE-2014-7169.
> 
> Jung-uk Kim
> 

The port is fixed with all known public exploits. The package is
building currently.

However bash still allows the crazy exporting of functions and may still
have other parser bugs. I would recommend for the immediate future not
using bash for forced ssh commands as well as these guidelines:

1. Do not ever link /bin/sh to bash. This is why it is such a big
problem on Linux, as system(3) will run bash by default from CGI.
2. Web/CGI users should have shell of /sbin/nologin.
3. Don't write CGI in shell script / Stop using CGI :)
4. httpd/CGId should never run as root, nor "apache". Sandbox each
application into its own user.
5. Custom restrictive shells, like scponly, should not be written in bash.
6. SSH authorized_keys/sshd_config forced commands should also not be
written in bash.


Cheers,
Bryan Drewery

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