Looks like they are trying to exploit one of the many buffer overflow vulns in apache. You should ensure your version is current and fully patched. Then go in and look at all the areas that you accept input and ensure the variables are at their lowest acceptable level. These are the basic things that's should be done. L *************************** Larry Whiteside Jr. Sr. Security Engineer -----Original Message----- From: Steven Shepherd [mailto:stevenat_private] Sent: Thursday, May 22, 2003 1:13 PM To: incidentsat_private Subject: DDoS Attack Our parent company is experiencing a very odd/severe DDoS attack coming from all over the place. For the most part, the attack is occuring at the Apache level. Log files show this request: [Tue May 20 09:13:33 2003] [error] [client 194.xxx.xxx.xxx] request failed: erroneous characters after protocol string: -nb GET !@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!-nb GET @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@-nb GET !@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!-nb GET +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +\x01TH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ Scans of some of the attacking IP's show BackOrifice installations. Has anyone had this sort of attack and what would be the best way to combat it? Not much luck from the upstream(s) thus far. ---------------------------------------------------------------------------- *** Wireless LAN Policies for Security & Management - NEW White Paper *** Just like wired networks, wireless LANs require network security policies that are enforced to protect WLANs from known vulnerabilities and threats. Learn to design, implement and enforce WLAN security policies to lockdown enterprise WLANs. To get your FREE white paper visit us at: http://www.securityfocus.com/AirDefense-incidents ---------------------------------------------------------------------------- ---------------------------------------------------------------------------- *** Wireless LAN Policies for Security & Management - NEW White Paper *** Just like wired networks, wireless LANs require network security policies that are enforced to protect WLANs from known vulnerabilities and threats. Learn to design, implement and enforce WLAN security policies to lockdown enterprise WLANs. To get your FREE white paper visit us at: http://www.securityfocus.com/AirDefense-incidents ----------------------------------------------------------------------------
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