It is curious to see how different company choose to incorporate and document opensource software in their products. But that is a different rant for a different time.
Today is the day engineers around the world hit the internet looking through pages and pages of documentation. I have done some research and wanted to add what I found to hopefully shorten someones search.
Cisco ASA 8.4 code is running openssl 0.9.8f Safe
- To view for your self SSH to your LTM log in as root and run "openssl version"
Here are some more links about the Vulnerability
I came across an iRule that identifies multiple connection attempts from an IP address and throttle their connection. Because it is an iRule you can completely configure both the connection limit, timeouts, and even the message your F5 will send the user.
when RULE_INIT {
# This is the max requests allowed during "interval" specified below.
set static::maxRate 125;
# Below is the lifetime of the subtable record in seconds.
# This defines the interval during which requests are tallied. Example: Rate=10 and Timeout=3, allows 10 requests in 3 seconds
# Note: do not use very high timeout because it increases memory utilization especially under high load.
# Note: A rate of 100 in 50 seconds is the same is a rate of 20 in 1 second. But 1 second is a lot easier on memory,
# Because the records expire more quickly and the table does become too large.
set static::timeout 3;}
when HTTP_REQUEST {
set getCount [table lookup -notouch -subtable requests [IP::client_addr]]
if { $getCount equals "" } {
# log local0. "New one: getCount=$getCount [IP::client_addr] [clock seconds]"
table set -subtable requests [IP::client_addr] "1" $static::timeout $static::timeout
} else {
if { $getCount < $static::maxRate } {
table incr -notouch -subtable requests [IP::client_addr]
} else {
if {$getCount == $static::maxRate } {
log local0. "User @ [IP::client_addr] [clock seconds] has reached $getCount requests in $static::timeout seconds."
table incr -notouch -subtable requests [IP::client_addr]
}
HTTP::respond 501 content "We apologize but your request/sec limit has exceeded the set threshold. Please wait 30 seconds and refresh the page."
#drop
#return
This iRule will allow you to block requests to your website from IP address that are not from the US. GeoIP blocking is flexible and a way of white listing traffic to your servers. It does have it's limitations though.
GeoIP Databases change all the time. To keep the F5 GeoIP database up to date wouldn't be practical.
Some may consider this a security measure. But to limit IP traffic from a limited geographic area is not an affective security measure. Real bad guys will proxy or use un willing victims to carry out their attacks.
when CLIENT_ACCEPTED {if {not ([whereis [IP::client_addr] country] eq "US")}{reject}}
The following is a list of Country Codes you can test with.
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Let us know what you think of Snowden