[PATCH 03/21] Mapped CCI-001125 to requirement_unclear.
Shawn Wells
shawn at redhat.com
Tue Jul 3 23:10:51 UTC 2012
On 7/3/12 6:52 PM, Willy Santos wrote:
> CCI-001125 requires employing automated mechanisms to enforce strict adherence to protocol format. This mapping is a request for input/discussion.
>
> Signed-off-by: Willy Santos <wsantos at redhat.com>
> ---
> rhel6/src/input/auxiliary/srg_support.xml | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/rhel6/src/input/auxiliary/srg_support.xml b/rhel6/src/input/auxiliary/srg_support.xml
> index 4035c61..caf0ac4 100644
> --- a/rhel6/src/input/auxiliary/srg_support.xml
> +++ b/rhel6/src/input/auxiliary/srg_support.xml
> @@ -38,7 +38,7 @@ The requirement is impractical or out of scope.
> <description>
> It is unclear how to satisfy this requirement.
> </description>
> -<ref disa="20,31,218,219,224,1097,1159" />
> +<ref disa="20,31,218,219,224,1097,1159,1125" />
> </Group> <!-- end requirement_unclear -->
>
> <Group id="new_rule_needed">
SRG-OS-000155 CCI-001125 The operating system must employ automated
mechanisms to enforce strict adherence to protocol format. Crafted
packets not conforming to IEEE standards can be used by malicious people
to exploit a host’s protocol stack to create a Denial of Service or
force a device reset.
This also indirectly maps back to NIST 800-53 SC-7(10):
SC-7(10)
Description
The organization prevents the unauthorized exfiltration of
information across managed interfaces.
Enhancement Supplemental Guidance
Measures to prevent unauthorized exfiltration of information from
the information system include, for example: (i) strict adherence to
protocol formats;
...
<rest snipped by swells>\...
I'm so far from a networking guru that it's not funny, but over at
Westfields we're doing the following to meet this. Perhaps
new_rule_needed with the following text:
> # force SYN packet check for SC-7(10)
> # makes sure NEW connections start with a SYN packet,
> # if they don't could be an indication of misformed connection & protocols
> -A INPUT -p tcp ! --syn -m state --state NEW -j DROP
>
> # check for malformed XMAS packets for SC-7(10)
> -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
>
> # drop all NULL packets for SC-7(10)
> -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
>
> # force fragment packet check for SC-7(10)
> # packets with incoming fragments get dropped
> -A INPUT -f -j DROP
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