Resumen rápido:

Deshabilitamos la mayor parte de funciones potencialmente peligrosas para el sistema.
Esto implica que fallen algunas aplicaciones, como Horde

# /etc/php5/apache2/php.ini)
disable_functions = system,passthru,readfile,escapeshellarg,proc_close,proc_open,ini_alter,dl,show_source,curl_exec

La alternativa elegante sería activar safe_mode y dejar de usar sendmail, como vemos en el fragmento de la configuración de Horde:

# fragmento de la configuracion de horde
# /etc/psa-webmail/horde/horde/conf.p
if (ini_get("safe_mode") == "1") { // Safe mode in action
$conf['mailer']['params']['host'] = '127.0.0.1';
$conf['mailer']['params']['port'] = 25;
$conf['mailer']['params']['auth'] = false;
$conf['mailer']['type'] = 'smtp';
} else {
$conf['mailer']['params']['sendmail_path'] = '/usr/sbin/sendmail';
$conf['mailer']['params']['sendmail_args'] = '-oi';
$conf['mailer']['type'] = 'sendmail';
}

En Plesk10 se han definido plantillas para los servicios de forma que aunque cambiasemos los ficheros de configuarción de apache estos cambios se terminarían machacando y volveríamos al estado por defecto.

Para ello, Plesk ha provisto un repositorio de plantillas para configurar los servicios en /usr/local/psa/admin/conf/templates/

Para reconfigurar la plantilla tenemos aqui un copy&paste muy cómodo, como siempre nos gusta:

# reemplazar safe_mode en la plantilla
sed -i 's/safe_mode off/safe_mode on/g' /usr/local/psa/admin/conf/templates/default/horde.php
# reconfigurar las plantillas
/usr/local/psa/admin/bin/httpdmng --reconfigure-server
# recargar el servicio
apache2ctl graceful

Para probarlo es necesario cerrar la sesión de Horde y volver a autenticarse.

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En este otro sitio teneis una entrada en el blog del propio github

Si teneis cuenta en github se recomienda encarecidamente que cambieis vuestras credenciales

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• Linux – Plesk 10.3.1
• Linux – Plesk 9.5.4
• Linux – Plesk 8.6.0
• Windows 10.3.1
• Windows Plesk 9
• Windows Plesk 8

Se han publicado parches para solucionar estos problemas. Instalando los microupdates se corrije el problema, excepto en las versiones para Windows Plesk 9 y Windows Plesk 8 que se han publicado parches específicos en este enlace :

How to fix vulnerability in Plesk 8.6, 9.3, and 9.5 for Windows

Para las versiones linux se puede ejecutar este comando para actuailzar la distribución:

/usr/local/psa/admin/sbin/autoinstaller --select-product-id plesk --select-release-current --reinstall-patch --install-component base

Y por último si queremos verificar la versión de nuestra instalación lo podemos comprobar así:

cat /usr/local/psa/version

No hace falta decir que es crítico actualizar el sistema.

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En Apache se ha descubierto una vulnerabilidad que permite realizar un ataque de denegacion de servicio y en rails es posible realizar XSS y SQL Injection.

A continuación más detalles :

Apache: http://www.debian.org/security/2011/dsa-2298

CVE-2010-1452, CVE-2011-3192.

Rails: http://www.debian.org/security/2011/dsa-2301

CVE-2011-2930, CVE-2011-2931, CVE-2011-3186, CVE-2009-4214.

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Muy recomendable leerse el documento complento en SecurityByDefault.

Gracias a Malakun por el enlace

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Para evitar esta vulnerabilidad que afecta a Bind 9.7.1 ( Parallels Plesk Panel 9.5 for windows ) y y 9.7. ( Parallels Plesk Panel 10 for windows ) deben ser actualizados a Bind 9.7.3 immediatamente.

La vulenariblidad se detalla en :

https://www.isc.org/software/bind/advisories/cve-2009-0696

Detalles de como actualizar BIND para Plesk Windows en http://kb.parallels.com/5542

Parallels está preparando un parche para liberarlo próximamente.

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Más información en
http://www.parallels.com/download/plesk/products/

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Dear Parallels Plesk Panel Customer,

Parallels has issued a security hotfix to Parallels Plesk Panel 10.0.1 through the Micro-Updates system.

It is referenced as MU#2 – Plesk admin password changing.

The Micro-Update delivers bug fix for a vulnerability that could allow authorized Plesk users to change Plesk ‘admin’ password and then compromise Control Panel.

For instructions on implementing Micro-updates, please refer to:

http://kb.parallels.com/en/9294 – Using Micro-Updates in Parallels Plesk Panel 9.x, 10.x and Parallels Small Business Panel.

For instructions on upgrading from the panel, please refer to the Administrator Manual at:

http://download1.parallels.com/Plesk/PP10/10.0.1/Doc/en-US/online/plesk-administrator-guide/index.htm?fileName=59215.htm

This notification is made pursuant to our development policy of notifying users when critical security issues arise and making fixes available as soon as possible. Please ensure that this patch has already been applied as soon as possible.

Parallels Plesk Panel Team

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Parallels strives to deliver solutions to potential vulnerability issues of component parts as soon as they are identified.  Please pay attention to this notification as it contains an Important Security Notification. More information can be found on the Parallels website, by visiting: http://www.parallels.com/products/plesk/proftpd 

Affected Products: Parallels Plesk Panel 9.5x and 10 include this vulnerability (no prior versions included this version of the component). Parallels Small Business Panel 10.2 is also affected.

Details of the Vulnerability or Exploit:  A flaw in ProFTPD FTP server potentially allows unauthenticated attackers to compromise a server. The problem is caused by a buffer overflow in the pr_netio_telnet_gets() function for evaluating TELNET IAC sequences.
ProFTPD is capable of processing TELNET IAC sequences on port 21; the sequences enable or disable certain options not supported by the Telnet or FTP protocol itself. The buffer overflow allows attackers to write arbitrary code to the application’s stack and launch it. Updating to version 1.3.3c of ProFTPD solves the problem.

Fixes for the Vulnerability or Exploit: Parallels has used its micro-update patch functionality in Plesk 9.5x and 10.x to fix this exploit. You can run the Parallels AutoInstaller to fix this or check the Updates section of your Plesk Panel 9.5x or 10.x to fix this. This is a file-replace, as opposed to a new install so it will be quick and reliable. To find this in the GUI:

• Parallels Plesk Panel 9.5x: “Home” -> “Updates” -> Select the Panel version which has updates -> click “Install” ?
• Parallels Plesk Panel 10.x:“Server Management” -> “Tools & Utilities” -> “Updates” -> “Update Components” -> click “Continue”

These ProFTPD fixes are also available from the Parallels AutoInstaller for Plesk 9.52, 9.53, and Plesk 10.01. You should already have downloaded this as part of Plesk. Use:

# $PRODUCT_ROOT_D/admin/sbin/autoinstaller

Or use the following parameters:

# $PRODUCT_ROOT_D/admin/sbin/autoinstaller –select-product-id plesk –select-release-current –reinstall-patch –install-component base

The patch for Parallels Small Business Panel 10.2 will be posted by 12 noon GMT on Friday November 12, 7am EST in the US)
 
If you have any concerns or need assistance applying these patches to your system, please contact us at: http://www.parallels.com/support/plesk/free10assistance_toc/ . A valid Plesk license key is required.

Thank you for your attention to this important matter.

The Parallels Plesk Panel Team

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Important Plesk Notification:

ProFTPD Remote Code Execution Vulnerability and Exploit
A flaw in the popular ProFTPD FTP server potentially allows unauthenticated attackers to compromise a server. The problem is caused by a buffer overflow in the pr_netio_telnet_gets() function for evaluating TELNET IAC sequences.

ProFTPD bug report: http://bugs.proftpd.org/show_bug.cgi?id=3521

Parallels Plesk Panel 9.x, 9.5x and 10 include this vulnerability. Parallels will issue Micro Updates (hotfixes) for 9.5.2 and 9.5.3 no later than 12:00 GMT (noon) on Thursday November 11, (7:00am EST in the US) to fix this.
The patch for Parallels Plesk Panel 10.01 will be released at 17:00 GMT on Thursday November 11, (12:00pm EST in the US).
Patches for Plesk 9.0, 9.22, and 9.3 will be posted by 12 noon GMT on Friday November 12, (7am EST in the US). Parallels updates on this will be coming soon.

MORE INFORMATION:
Updating to ProFTPD version 1.3.3c or disabling FTP services is the only current solution to this vulnerability. ProFTPD is capable of processing TELNET IAC sequences on port 21; the sequences enable or disable certain options not supported by the Telnet or FTP protocol itself. The buffer overflow allows attackers to write arbitrary code to the application’s stack and launch it. Updating to version 1.3.3c of ProFTPD solves the problem.
The update also fixes a directory traversal vulnerability which can only be exploited if the “mod_site_misc” module is loaded. This flaw could allow attackers with write privileges to leave their permitted path and delete directories or create symbolic links
outside of the path. The module is not loaded or compiled by default.

A remote root exploit is available: [Full-disclosure]ProFTPD IAC Remote Root Exploit
A Proftpd update for Plesk has been provided by Atomic Rocket Turtle. To apply the update, execute the commands below.
# wget -O – http://www.atomicorp.com/installers/atomic |sh # yum upgrade psa-proftpd
Please review http://www.parallels.com/products/plesk/ProFTPD for updates to this security issue.

Por supuesto se recomienda actualizar de forma urgente.

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