Over 1000 Http Requests

Jan 12, 2008

Quote:

netstat -anpl|grep 80|grep 74.xx.179.xxx|wc -l
990

I observed too many http requests into the server, so just wonder how your guys twaek server to accept over 1000 request and more?

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Apr 20, 2005

I set up a cron to run every minute & I'm running a PHP script by way of cron like

wget http://example.com/some_script.php

Now does each request of Cron is a seperate HTTP Request or what? Say my script takes more than 1 minute to execute completely but before its completed, its called again. So, will that effect the PHP script running because of previous HTTP Request or will it create a new HTTP Request & let the previous request finish its operation? Technically, it shouldn't block/affect the previous request, but I'm not sure!!

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What Else Would Be Blocking HTTP Requests

Jan 19, 2007

I have a guy who can't get to any of the 100 or so virtual hosts on my RHEL3 server.

It's running the latest Apache RPM from RedHat. I also have mod_evasive and mod_security running.

Here's what I know. The guy *CAN* connect via SSH and FTP. The guy *CAN* see the default web page when he hits the IP in his web browser (e.g. he types [url]into the address bar on IE). But when he uses any of the host names on the server he *CAN NOT* see anything. He gets timeout errors.

His IP in NOT in ANY error logs, it's not in mod_evasive or mod_security, it's not in IPTABLES, it's not anywhere I can see.

I must be missing something. Anyone have any ideas?

What would be in front of Apache blocking his requests?

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Oct 8, 2007

There seems to be some problem with my server, none of the websites hosted on my server are accessible, the http requests either return a blank page or a page with a red quare on the upper left hand corner.

I am not sure if this is some kind of infection or DNS problem or a problem with memory apache is taking up
as i have thousands of virtualhost entries in my access log accumulated over the years out of which only a few 100 websites i am serving presently, but never deleted the non-exitent virtualhost blocks.

At times the websites are opening but most of the times they are not. And when they do not open my http requets are not logged in apacha access log.

Even the customers have reported the same problem.

Also, just four days back i had a strange issue where all
http requests to my server would take me to [url].

I can SSH to server, and everything else is working fine.

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When i try to open any website hosted on my server (around 50 of them) i am being taken to following malware website;

[url]
[url]
This is a problem with my Limnux server running Apache and not a virus on my local computer as customers from all over are reporting the same issue.

As soon as i restart Apache eveything returns to normal with no such redirects.

I think my server is being attacked causing http requests to get redirected to some malicious website.

This issue would resurface almost every hour and would not go away till i restart apache.

So far my Datacenter techs. have not been able to identify the cause of this.

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My Linux Server's Http Daemon (Apache) would stop serving websites ever so often, as soon as apache is restarted the error fixes iteself only to resurface within few hours.

The apache process would still be running i.e. apache does not die but no websites hosted on my server would be accessible from browser. And when this happens the apache logs do not log any http requests.

Instead when this happens all http requests to my server would be redirected to some weird Trojan website and my Norton Antivirus would show an Alert/Warning, for example;
"Browser exploit at www.xxx.xxx was blocked"
Risk Name: MSIE WebViewFolderIcon ActiveX Control BO

or another error like;
"Auto-Protect has detected Trojan.Fakeavalert".

At first i thought the problem could be with my Laptop/ISP so i logged on to the server via SSH and opened try to open a website using command line "lynx mywebsite.com" and it shows following error;
"Alert!: HTTP/1.0 503 Service Unavailable".

Now if i assume my laptop were to be infected, then as soon as i restart my apache and visit mywebsite.com eveything returns to normal with no such warnings. Why do i see those norton error messages only when apache is down with 503, and when apache is down with 503 how come the http requests always get redirected to some suspicious websites and nothing gets logged in apache error log?

I think my server is being attacked causing http to get unresponsive and thereafter http requests to my server are redirected to some malicious website, is this correct?

Also, i suspect this is a php script exploit as some customers have reported that google have blocked their website due to security reasons, i found <iframe> tage inserted in some php pages which i fixed.

Also, another thinh i noticed;
when apache responds with the 503 it is referencing PHP 5.1.4 in the header response:

[root@]# curl -I xxx.xxx.xxx.xxx (my server ip)
HTTP/1.0 503 Service Unavailable
Server: Apache
X-Powered-By: PHP/5.1.4
Retry-After: 20

I am running PHP 4.3.9m why does apache responds with PHP 5.1.4 when this 503 error surfaces?

Also, since my apache was dowan with 503 error a customer mailed in today saying;
"It seems that my site www.xxxx.com is regularly down, and the winlogon virus is involved."

I suspect this is again due to the fact that http requests start getting redirected?

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I have noticed that if I delete lines from the files, I don't have this problem.

If I try viewing images (so I know it can't be an html of php problem) some look fine (the very small files). But, larger files, around 168 kb, load halfway and the second half is distorted (green and purple chunks and other random colors and lines).

If I view the image through https, the image is perfectly fine!

If I put my site through w3.org's validator (just to see what it would report) it says "500 Line too long (limit is 4096)".

My website used to work, so I know there isn't any code in the pages that would cause this to happen.

Is there an Apache setting I check? Perhaps it is sending a really long header that I can not see? I am not really sure what to do. I have made my site to force https but it's slow and not signed.

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my server is still effed up from the MPack attack that I received.

I just received the following email, does anyone know what this means or how it could be done? The client IP is mine, so some how my server is sending that request?

72.233.79.2 (malwarebytes.org) Server Log:

[Thu Jul 24 13:05:07 2008] [error] [client 72.55.184.144] mod_security:
Access denied with code 403. Pattern match ".../" at THE_REQUEST
[id "300006"] [rev "1"] [msg "Bogus Path denied"] [severity "CRITICAL"]
[hostname "www.malwarebytes.org"] [uri
"/errors.php?error=[url][unique_id "tNAGeH8AAAEAAEsfD7wAAAAO"]
[Thu Jul 24 13:05:07 2008] [error] [client 72.55.184.144] mod_security:
Access denied with code 403. Pattern match ".../" at THE_REQUEST
[id "300006"] [rev "1"] [msg "Bogus Path denied"] [severity "CRITICAL"]
[hostname "www.malwarebytes.org"] [uri
"/forums/errors.php?error=[url][unique_id
"tNAPAn8AAAEAAD7mqWQAAAAl"]

[url]is the RKHunter scan log
[url]is the ChkRootKit scan log.

I'm going through this thread right now:
[url]("How-to detect a possible intruder?") and I've come across a handful of hidden directories:

/home/mifbody/public_html/vbulletin/arcade/images/. /. /xh
/home/mifbody/public_html/vbulletin/arcade/images/. /. /xhide.c
/home/mifbody/public_html/vbulletin/arcade/images/. /. /obj/convertxdccfile.o
/home/mifbody/public_html/vbulletin/arcade/images/. /. /obj/iroffer_admin.o
/home/mifbody/public_html/vbulletin/arcade/images/. /. /obj/iroffer_dccchat.o
/home/mifbody/public_html/vbulletin/arcade/images/. /. /obj/iroffer_display.o
/home/mifbody/public_html/vbulletin/arcade/images/. /. /obj/iroffer_main.o
/home/mifbody/public_html/vbulletin/arcade/images/. /. /obj/iroffer_md5.o
/home/mifbody/public_html/vbulletin/arcade/images/. /. /obj/iroffer_misc.o
/home/mifbody/public_html/vbulletin/arcade/images/. /. /obj/iroffer_statefile.o
/home/mifbody/public_html/vbulletin/arcade/images/. /. /obj/iroffer_transfer.o
/home/mifbody/public_html/vbulletin/arcade/images/. /. /obj/iroffer_upload.o
/home/mifbody/public_html/vbulletin/arcade/images/. /. /obj/iroffer_utilities.o
/home/mifbody/public_html/vbulletin/arcade/images/. /. /src/convertxdccfile.c
/home/mifbody/public_html/vbulletin/arcade/images/. /. /src/iroffer_admin.c
/home/mifbody/public_html/vbulletin/arcade/images/. /. /src/iroffer_config.h
/home/mifbody/public_html/vbulletin/arcade/images/. /. /src/iroffer_dccchat.c
/home/mifbody/public_html/vbulletin/arcade/images/. /. /src/iroffer_defines.h
/home/mifbody/public_html/vbulletin/arcade/images/. /. /src/iroffer_display.c
/home/mifbody/public_html/vbulletin/arcade/images/. /. /src/iroffer_globals.h
/home/mifbody/public_html/vbulletin/arcade/images/. /. /src/iroffer_headers.h
/home/mifbody/public_html/vbulletin/arcade/images/. /. /src/iroffer_main.c
/home/mifbody/public_html/vbulletin/arcade/images/. /. /src/iroffer_md5.c
/home/mifbody/public_html/vbulletin/arcade/images/. /. /src/iroffer_md5.h
/home/mifbody/public_html/vbulletin/arcade/images/. /. /src/iroffer_misc.c
/home/mifbody/public_html/vbulletin/arcade/images/. /. /src/iroffer_statefile.c
/home/mifbody/public_html/vbulletin/arcade/images/. /. /src/iroffer_transfer.c
/home/mifbody/public_html/vbulletin/arcade/images/. /. /src/iroffer_upload.c
/home/mifbody/public_html/vbulletin/arcade/images/. /. /src/iroffer_utilities.c

I was able to successfully delete all the files, but how do I now get rid of the directories themselves? When I do:
rm -fr "/arcade/images/. /"
and then locate ". "
I still get:

/home/mifbody/public_html/vbulletin/adserver/banners/.
/home/mifbody/public_html/vbulletin/alice/src/admin/.
/home/mifbody/public_html/vbulletin/arcade/images/.

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Code:
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HTTP/1.0 with response code(s) 2 404 responses
GET http:/ /74.52.21.100/index.php2?goto=[url]
HTTP/1.0 with response code(s) 2 404 responses
GET http:/ /74.52.21.102/index.php2?goto=[url]
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what is happening here, as this looks to be something dodgy.

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