Difference between revisions of "Atomic Secured Linux"
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=== ASL 3.2 Release Notes === | === ASL 3.2 Release Notes === | ||
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Revision as of 14:23, 5 February 2013
Contents |
About ASL
Atomic Secured Linux(tm) is an easy to use out-of-the-box Unified Security Suite add-on for Linux(tm) systems designed to protect your servers against both known and unknown zero day threats. Unlike other security solutions, ASL is designed for beginners and experts alike. You just install ASL and it does the work for you.
ASL works by combining security at all layers, from the Kernel all the way up to the application layer to provide the most complete protection available for Linux servers and helps to ensure that your system is compliant with commercial and government security standards. ASL includes the most hardened kernel on the market, automated system hardening techniques, userspace and host Intrusion Prevention Systems (IPS), malware/rootkit detection and elimination, blacklisting technologies, an autolearning Role Based Access Control System and web application firewalling to protect multiuser and web application hosting environments like no other solution. ASL is uniquely effective at addressing emerging threats posed by vulnerabilities in today's complex systems and applications, such as web hosting environments, multiuser systems, CRM's, ERPs, forums, shopping carts, Content Management systems and custom applications.
The design of ASL approaches securing the server and its applications, by combining different layers of security technologies and application layer firewalls to filter out malicious content before it reaches your system and its applications. Our hardened kernel further enhances the overall security model by enforcing anti-rootkit, file, network and process level security policies on the system.
The ASL approach also includes our "Just In Time Patching" system, which allows you to address security threats posed by applications where either it is not possible to fix the application due to lack of source code, availability of resources, or the number of applications that make repairing all vulnerabilities economically infeasible. You can known that your systems are protected, even when you can't patch them.
You can read more about ASL on the ASL product page.
Purchasing
To purchase a license for ASL, please visit the Atomic Secured Linux product page.
Installation
Upgrading ASL
ASL Features
See the ASL Features article.
Adding more Licenses
To add more licenses simply log into your ASL License Manager account. You can also reset your ASL License Manager password on this page.
To reset a Support Portal password please send an e-mail to support@atomicorp.com with your request.
Documentation
ASL Documentation
Release Schedule
Frequently Asked Questions
Troubleshooting
Get support
ASL 3.2 Notes
ASL 3.2 Release Notes
MySQL
If you have "old_passwords=1" enabled in MySQL you will need to disable it and restart MySQL, and then reset your web console password(s). You can reset your ASL web console password(s) by running this command as root:
/var/asl/bin/asl-web-setup
Self Healing System
This release adds a new self-healing component to detect and repair corrupt tortix databases. In order to activate the new self-healing rules, the HIDS component will need to be restarted (not reloaded). If you are experiencing corrupt database conditions now, or otherwise have issues with the event viewer not showing any events you can force this to occur manually by upgrading to 3.2.4, restarting ossec hids and then manually running /var/asl/bin/asl_db_rotate. This will trigger the self-healing function and repair the database (note: this could take several minutes).
CPanel
New Installs with Cpanel
If you are running CPanel, Cpanel uses an older vulnerable version of modsecurity. ASL will replace this with 2.7.1, however Easyapache sometimes leaves older versions installed on the system and these will need to be flushed out for 2.7.1 to install correctly. Therefore, when installing on a cpanel system make sure that modsecurity is disabled and uninstalled in cpanel before installing ASL.
Do not enable modsecurity in CPanel, this will at best cause serious conflicts and will cause CPanel to overwrite modsecurity with an older vulnerable version of modsecurity, in most cases this will also result in apache not starting. Do not use CPanel to install modsecurity. ASL will install, manage and automatically upgrade modsecurity itself.
ASL is also not supported with any third party modsecurity tools. Remove these tools before installing ASL.
Upgrading ASL with CPanel
If you are running CPanel, Cpanel uses an older vulnerable version of modsecurity. ASL will replace this with 2.7.1, however Easyapache sometimes leaves older versions installed on the system and these will need to be flushed out for 2.7.1 to install correctly. Therefore, when upgrading ASL make sure that you follow this three step process:
Step 1)
Run this command as the root user:
/var/asl/bin/aum -uf
Step 2)
Run this command as the root user:
/scripts/easyapache --build
Step 3)
Run this command as the root user:
/var/asl/bin/asl -s -f
Firewall
This release includes our new Advanced Firewall capabilities, including a vast new array of firewall Target & Condition flags for ASL kernel environments through the xtables-addons package. This package will be automatically installed once ASL has been upgraded to 3.2. The ASL updater is the recommended method to ensure the system is in sync with the recommended ASL release. It can be run directly with:
aum -u
Minimum OS version
Redhat 6, CloudLinux 6, and CentOS 6 platforms will need to be on a minimum of Release 6.3 to access necessary dependencies to upgrade to ASL 3.2.
WAF
Updating the WAF to 2.7.1 will require an update of existing rules to a 2.7.1 compatible format. ASL generated exceptions will automatically be updated to this format when the policy is updated by:
/var/asl/bin/asl -s -f
If you have custom rules you have created yourself, you will need to make sure they each have an id: and that the id: is unique. modsecurity 2.7.x requires an id for each rule, and it must be unique. Be careful to not use rule id:s that are reserved. The current reserved ranges are 100000-3000000. 1-99999 should be used for custom internal local rules. If you share your rules with others, dont use the 1-99999 range, instead use rule ids in the non-reserved range (3000000 and up)
Xen
Xen does not support the latest kernel security enhancements, therefore for Xen users will need to continue using the 2.6.32.59-28 kernel. Please see the ASL 3.2 Virtualization Notes for details. Please see the kernel page for instructions on installing, and configuring the ASL kernel.
An updated Xen kernel is planned for release at the end of Q1 2013 that will not include these enhancements, as Xen does not support them. ASL will report these as vulnerabilities.
ASL 3.0 Notes
ASL 3.0 Release Notes
GUI issues
Make sure that you clean your browsers cache when logging into 3.0 if you have been using 2.2. This will clear out any old cached AJAX elements from the 2.2 GUI. You only need to do this once.
Authentication
The Authentication system in ASL Web has changed. Your ASL Username & Password is now the default login. This can be changed from the User manager interface, or from the command line using: /var/asl/bin/asl-web-setup or /var/asl/bin/asl-web-passwd <username>
PHP
ASL 3.0 added five new high risk PHP functions:
- pfsockopen
- fsockopen
- curl_exec
- curl_multi_exec
- ftp_exec
These are disabled in ASL by default, if you configure ASL to harden PHP. If you have a web application that uses these functions, please ensure that you re-enable them.
For example, to re-enable fpsockopen and fsockopen, just change these settings in ASL:
ALLOW_pfsockopen and ALLOW_fsockopen
to "yes"
Disabled Rules and Signatures
/etc/asl/disabled_signatures has been replaced by /etc/asl/rules. Disabled rules are not imported from 2.2 to 3.0 configurations, they will need to be re-added through ASL Web's Rule Manager, or from the command line using:
/var/asl/bin/asl -dr <rule id>
End of Life Operating systems
Redhat and the Centos project both announced that RHEL 4 and CentOS 4 are End of Life as of February 29th, and are no longer supported by them. Accordingly, those platforms are also no longer supported by Atomicorp.
Xen
If you are using Xen, you will want to use the Xen kernel.
Non-Hardware accelerated 32bit virtualization environments
If you are forced to use a non-hardware accelerated 32bit virtualization environment, you will want to disable CONFIG_PAX_MEMORY_UDEREF. To do this add this line to your grub.conf bootline:
pax_nouderef
Example:
kernel /vmlinuz-2.6.32.59-17.art.x86_64 ro root=/dev/md0 console=tty0 console=ttyS0,57600n8 panic=5 pax_nouderef
ASL 3.0 Known Issues
1. Centos and Redhat 4 do not include an up to date SSL certificate file, which will result in bogus errors such as these:
Redhat and the Centos project have both announced that RHEL 4 and CentOS 4 are End of Life as of February 29th, and are no longer supported by them. Accordingly, those platforms are also no longer supported by Atomicorp.
asl -u
Checking for updates..
ASL version is current: 3.0 [OK]
APPINV rules are current: 201008021738 [OK]
Update failed for some reason, retrying with full debug information...
--17:25:04-- https://username:*password*@www.atomicorp.com/channels/asl-2.0/rules//clamav-201107191237.tar.gz
=> `/var/asl/updates/clamav-201107191237.tar.gz'
Resolving www.atomicorp.com... 74.208.155.133
Connecting to www.atomicorp.com|74.208.155.133|:443... connected.
ERROR: Certificate verification error for www.atomicorp.com: self signed certificate in certificate chain
To connect to www.atomicorp.com insecurely, use `--no-check-certificate'.
Unable to establish SSL connection.
exiting...
The certificate used is not self signed, however older Centos and Redhat distributions do not include up to date certificate authority information. One solution is to use a newer certificate authority file from Red Hat and Centos versions 5 and 6. We have included the certificate file from Centos 5 at the URL below:
https://www.atomicorp.com/installers/cert.pem
On RHEL and Centos 4 systems, the default certificate authority file is stored in:
/usr/share/ssl/cert.pem
Simply download the cert.pem file from the URL above, and overwrite the file at /usr/share/ssl/cert.pem. We highly recommend you make a backup of your current file, and that you download this file from us only over an SSL connection and not in the clear. For example, use a browser that does have up to date CA certificates to download this file to ensure that it is not tampered with during transit, or simply get a copy of a RHEL or Centos 5 or 6 distribution and get a copy from there.
2. There is a known bug in early versions of 3.0 that can occur if you have the malware protection rules turned off, and the malware output rules turned on (which are new and on by default in 3.0).
There are three solutions:
Option 1) Upgrade ASL to the current release
Option 2) Disable the MODSEC_99_MALWARE_OUTPUT rules, set them to "no". (Least secure method)
Option 3) Enable the malware protection rules, change MODSEC_10_ANTIMALWARE to "yes". (Most secure method)
We will be putting out a point release shortly to resolve this so you can enable the malware output protection rules with the malware rules disabled. For now, you have to either enable both, or disable both.
ASL 2.2 Release Notes
New Web GUI to manage everything, plus everything in 1.0 and tons of new features and security:
- Vulnerability scanner
- Hardening tools to secure your system
- Stack overflow protection from the PaX project, that addresses exploits in services on the system, such as apache, bind, secure shell, mysql, postgres, etc.
- Virtual Patching of web applications, which makes its possible to use software which have vulnerabilities when a patch is not available or it is not possible to install one
- Web Application Firewall through mod_security, and the industry leading rules created by Atomicorp at gotroot.com, optimized for Plesk Server Administrator environments.
- Realtime malware scanning of web, email and local filesystems
- Domain based control of antispam and antimalware features (for control panels like Plesk)
- Automatic process monitoring, alerting and actions, such as restarting critical processes that have died, have hung or are consuming too many resources
- An intelligent and robust Role-Based Access Control (RBAC) system that can generate least privilege policies for your entire system with no configuration, from the Grsecurity project.
- Trusted Path Execution, which only allows untrusted users such as apache to execute commands owned by root, thus simply preventing a whole class of exploit techniques used by attackers, or internet worms
- Users are restricted to only view their processes
- Denial of Service protection through mod_evasive
- Realtime attack shunning and blocking, and policy based unshunning after user defined period of time
ASL Kernel (grsecurity, firewall additions like match, and stealth), mod_security and, mod_evasive for input validation, and DoS protection, userspace HIDS with ossec, application inventory module, compliance and vulnerability scanner, and PSA integration.
ASL 1.0 Release Notes
Atomic Secured Linux(tm) version 1.0 is a linux security solution, distributed through a subscription yum channel. It works by combining both Kernel hardening techniques, as well as userspace Intrusion Prevention Systems (IPS) to your web application hosting environment. ASL is specifically targeted at addressing the threats posed by vulnerabilities in applications, such as CRM's, forums, shopping carts, or other custom applications.
The design of ASL approaches securing the server, and its applications, by using an application layer firewall to filter out malicious content, before it reaches the application. The hardened kernel subsystems further enhance the overall security model by enforcing file and process level security policies on the system.
The advantages of the ASL approach to security, is that it addresses the security threats posed by web based applications where either it is not possible to fix the application due to lack of source code, or availability of resources, or the number of applications make repairing all vulnerabilities economically unfeasible.
It offers among many other features:
- Stack overflow protection from the PaX project, that addresses exploits in services on the system, such as apache, bind, or secure shell
- An intelligent and robust Role-Based Access Control (RBAC) system that can generate least privilege policies for your entire system with no configuration, from the Grsecurity project.
- Trusted Path Execution, which only allows untrusted users such as apache to execute commands owned by root, thus simply preventing a whole class of exploit techniques used by attackers, or internet worms
- Users are restricted to only view their processes
- Application layer firewalling through mod_security, and the industry leading rules created by Atomicorp at gotroot.com, optimized for Plesk Server Administrator environments.
- Denial of Service protection through mod_evasive
