System-pci

PCI Compliance

The following procedure is to setup CentOS/RHEL 5.

How to find vulnerabilities with TrustKeeper

The original tool used : [[1]]

1. Click on "Questionnaires" along left side.
2. Click on "Network Questionnaire".
3. Enter in IP addresse(s).
4. Click on "Vulnerability Scan" along left side.
5. Click "Directed Scan Request" (This will scan the IP addresses set in #3)

How to find vulterabilities with SAINT

Using SAINT scanner is the way to go serious on internal audits. [[2]]

How to fix vulnerabilities in one step

The fast easy way is to download the following script and let it do the work

1. Download the compressed file from [3]
2. Decompress the file
3. Run the fix-vulnerability.sh script
4. Done

 wget http://repo.bashlinux.com/src/fix-vulnerability.tgz
 tar zxvf fix-vulnerability.tgz
 cd fix-vulnerability/
 ./fix-vulnerability.sh
 

How to deal with vulnerabilities

A default installation should yields the following results before adjust the system.

1. ++++ High OpenSSH <4.4 Multiple Vulnerabilities
2. +++ Med OpenSSH X11 Session Hijacking Vulnerability
3. +++ Med SSH Protocol Version
4. +++ Med OpenSSH Duplicate Block Denial of Service Vulnerability
5. ++ Low SSL Weak Encryption Algorithms
6. ++ Low Indexable Web Directories
7. + info TCP/IP Technical Information
8. + info Discovered HTTP Methods
9. + info Discovered Web Directories
10. + info Discovered Web Files

How to modify system services in order to pass the PCI compliance

The following services have been modified in order to fix the vulnerabilities on each of them.

OpenSSH

• Version 4.3p2-24
• Updated version: 4.3p2-26
• Edited `/etc/ssh/sshd_config` to check the following values:
  • added AddressFamily inet
  • checked Protocol 2
• Build openssh rpm from fedora srpm
  • Updated version 4.5 > Required version 4.4

OpenSSL

• Create certificats as specified in OpenSSL section.
• Generate self-signed key to avoid prompt for password when reboot apache

 # scp -r 10.0.0.120:/etc/pki/local /etc/pki/
 # cd /etc/pki/local
 # openssl rsa -in local.uwink.com.key -out local.uwink.com.pem
 

• Add certificate and key to `/etc/httpd/conf.d/ssl.conf` file

 ...
 SSLCertificateFile /etc/pki/local/local.bashlinux.com.crt
 ...
 SSLCertificateKeyFile /etc/pki/local/local.bashlinux.com.pem
 ...
 

• Restart http server
  • key length 1024 > required key length 128

HTTP

• Disabled LoadModule autoindex_module modules/mod_autoindex.so on `/etc/httpd/conf/httpd.conf` file
• Enclose mod_autoindex variables
• Open in line 588 with <IfModule mod_autoindex.c> directive
• Closed on line 659 with </IfModule> directive

Links

• Saint Documentaion and Vulnerability info

[[4]]