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Greg Zemslov, Guest Author from our Plesk partner Revisium talks about the websites threats that we don’t see, like site malware, and how to get rid of it.

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Information

A CVE-2014-3566 vulnerability in SSLv3 protocol was identified by the Google security team. There is an additional whitepaper available from OpenSSL that also describes this vulnerability.

You can check if your are vulnerable using the following script as an parameter specify your server IP:

{!{code}!}czoxODc6XCIjIHdnZXQgaHR0cDovL2tiLnNwLnBhcmFsbGVscy5jb20vQXR0YWNobWVudHMva2NzLTQwMDA3L3Bvb2RsZS5zaAojIGN7WyYqJl19aG1vZCAreCBwb29kbGUuc2gKIyBmb3IgaSBpbiBgZWNobyAyMSA1ODcgNDQzIDQ2NSA3MDgxIDg0NDMgOTkzIDk5NSBgOyBkbyAvYntbJiomXX1pbi9zaCAvcm9vdC9wb29kbGUuc2ggJmx0O0lQJmd0OyAkaTsgZG9uZQpcIjt7WyYqJl19{!{/code}!}

Resolution

The attack described above requires an SSL 3.0 connection to be established, so disabling the SSL 3.0 protocol in the client or in the server (or both) will deflect a potential attack.

You may use special scripts below to disable SSLv3 for all the services:

• for Linux – disables Apache, nginx, proftpd, courier-imap, qmail, postfix, dovecot, Plesk server engine (for versions 11.5 and later).
• for Windows – disable SSlv3 server wide.

See instructions below to disable SSLv3 per service.

Apache HTTPD Server

If you’re running Apache, include the following line in your configuration file /etc/httpd/conf/httpd.conf among the other SSL directives:

{!{code}!}czozMDpcIlNTTFByb3RvY29sIEFsbCAtU1NMdjIgLVNTTHYzClwiO3tbJiomXX0={!{/code}!}

And restart the server, e.g.

{!{code}!}czoyOTpcInN1ZG8gc2VydmljZSBhcGFjaGUyIHJlc3RhcnQKXCI7e1smKiZdfQ=={!{/code}!}

Nginx server

If you’re running Nginx, just include the following line in your configuration among the other SSL directives:

{!{code}!}czozNzpcInNzbF9wcm90b2NvbHMgVExTdjEgVExTdjEuMSBUTFN2MS4yOwpcIjt7WyYqJl19{!{/code}!}

additionally for all the sites in Plesk 11.5 for Linux:

{!{code}!}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{!{/code}!}

and sites in Plesk 12.0 for Linux:

{!{code}!}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{!{/code}!}

And reconfigure Apache:

{!{code}!}czo1NDpcIiMgL3Vzci9sb2NhbC9wc2EvYWRtaW4vYmluL2h0dHBkbW5nIC0tcmVjb25maWd1cmUtYWxsClwiO3tbJiomXX0={!{/code}!}

for all the sites in Plesk 10.4, 11.0.9 for Linux add to the Apache configuration file /etc/httpd/conf/httpd.conf the following string:

{!{code}!}czozMDpcIlNTTFByb3RvY29sIEFsbCAtU1NMdjIgLVNTTHYzClwiO3tbJiomXX0={!{/code}!}

and restart Apache:

{!{code}!}czoyNzpcIiMgL2V0Yy9pbml0LmQvaHR0cGQgcmVzdGFyClwiO3tbJiomXX0={!{/code}!}

Reference: Nginx documentation

Dovecot IMAP/POP3 server

Include the following line in /etc/dovecot/dovecot.conf

{!{code}!}czozMDpcInNzbF9wcm90b2NvbHMgPSAhU1NMdjIgIVNTTHYzClwiO3tbJiomXX0={!{/code}!}

Restart service:

{!{code}!}czoyOTpcInN1ZG8gc2VydmljZSBkb3ZlY290IHJlc3RhcnQKXCI7e1smKiZdfQ=={!{/code}!}

Courier IMAP

Edit the following files:

/etc/courier-imap/pop3d-ssl

/etc/courier-imap/imapd-ssl

Add the following string:

{!{code}!}czo3NTpcIlRMU19DSVBIRVJfTElTVD1cIkFMTDohU1NMdjI6IVNTTHYzOiFBREg6IU5VTEw6IUVYUE9SVDohREVTOiFMT1c6QFNUUkVOe1smKiZdfUdUSFwiClwiO3tbJiomXX0={!{/code}!}

Or just modify existing one and add !SSLv3 into cipher list.

Restart services:

{!{code}!}czo3MTpcIiBzdWRvIHNlcnZpY2UgY291cmllci1pbWFwcyByZXN0YXJ0IHN1ZG8gc2VydmljZSBjb3VyaWVyLXBvcDNzIHJlc3RhcnR7WyYqJl19ClwiO3tbJiomXX0={!{/code}!}

Postfix SMTP

For ‘opportunistic SSL’ (encryption policy not enforced and plain is acceptable too), you don’t need to change anything. Even SSLv2 is better than plain, so if you need to secure your server you should be using ‘mandatory SSL’ mode anyway.

For ‘mandatory SSL’ mode being configured already, just add/change the smtpd_tls_mandatory_protocols setting. Add the following string to the /etc/postfix/main.cf file:

{!{code}!}czo0NDpcInNtdHBkX3Rsc19tYW5kYXRvcnlfcHJvdG9jb2xzPSFTU0x2MiwhU1NMdjMKXCI7e1smKiZdfQ=={!{/code}!}

and restart Postfix:

{!{code}!}czoyOTpcInN1ZG8gc2VydmljZSBwb3N0Zml4IHJlc3RhcnQKXCI7e1smKiZdfQ=={!{/code}!}

You can verify if SSLv3 is disabled by using the following command:

{!{code}!}czo0NjpcIm9wZW5zc2wgc19jbGllbnQgLWNvbm5lY3QgbG9jYWxob3N0OjQ2NSAtc3NsMwpcIjt7WyYqJl19{!{/code}!}

If you are not vulnerable (SSLv3 disabled), your output should look something like this:

{!{code}!}czoyNDE6XCJDT05ORUNURUQoMDAwMDAwMDMpCjEzOTgwODYwNjEwNzQ2NDplcnJvcjoxNDA5NDQxMDpTU0wgcm91dGluZXM6U1NMM197WyYqJl19UkVBRF9CWVRFUzpzc2x2MyBhbGVydCBoYW5kc2hha2UgZmFpbHVyZTpzM19wa3QuYzoxMjU3OlNTTCBhbGVydCBudW1iZXIgNDAKMXtbJiomXX0zOTgwODYwNjEwNzQ2NDplcnJvcjoxNDA5RTBFNTpTU0wgcm91dGluZXM6U1NMM19XUklURV9CWVRFUzpzc2wgaGFuZHNoYWtlIGZhe1smKiZdfWlsdXJlOnMzX3BrdC5jOjU5NjoKXCI7e1smKiZdfQ=={!{/code}!}

If you are vulnerable, you should see normal connection output, including the line:

{!{code}!}czo2MDpcIkNPTk5FQ1RFRCgwMDAwMDAwMykKMjIwIG1haWwuZXhhbXBsZS5jb20gRVNNVFAgUG9zdGZpeApET05FClwiO3tbJiomXX0={!{/code}!}

Microsoft Internet Information Services

Official Microsoft knowledge base article about disabling particular protocol in IIS:
How to disable PCT 1.0, SSL 2.0, SSL 3.0, or TLS 1.0 in Internet Information Services

Microsoft Windows Server stores information about different security-enhanced channel protocols that Windows Server supports. This information is stored in the registry key.

1. Click Start, click Run, type regedt32 or type regedit, and then click OK.

2. In Registry Editor, locate the following registry key:

   {!{code}!}czoxMDQ6XCJIS0VZX0xPQ0FMX01BQ0hJTkVcXFN5c3RlbVxcQ3VycmVudENvbnRyb2xTZXRcXENvbnRyb2xcXFNlY3VyaXR5UHJvdmlkZXJze1smKiZdfVxcU0NIQU5ORUxcXFByb3RvY29sc1xcU1NMIDMuMFxcU2VydmVyClwiO3tbJiomXX0={!{/code}!}

3. On the Edit menu, click Add Value.

4. In the Data Type list, click DWORD.

5. In the Value Name box, type Enabled, and then click OK.

   Note: If this value is present, double-click the value to edit its current value.

6. Type 00000000 in Binary Editor to set the value of the new key equal to “0”.

7. Click OK. Restart the computer.

As Plesk is using the same SSL engine, sw-cp-server service should be also configured to protect from SSL vulnerability.

Plesk 11.5 and later

Edit ‘/etc/sw-cp-server/config’, add

{!{code}!}czozODpcIiBzc2xfcHJvdG9jb2xzIFRMU3YxIFRMU3YxLjEgVExTdjEuMjsKXCI7e1smKiZdfQ=={!{/code}!}

Restart:

{!{code}!}czozNTpcIiBzdWRvIHNlcnZpY2Ugc3ctY3Atc2VydmVyIHJlc3RhcnQKXCI7e1smKiZdfQ=={!{/code}!}

Plesk 11.0

Edit /usr/local/psa/admin/conf/ssl-conf.sh, add the echo 'ssl.use-sslv3 = "disable"' after the echo 'ssl.use-sslv2 = "disable"' directive, so it should looks alike:

{!{code}!}czo5NzpcIiBlY2hvIFwnc3NsLmVuZ2luZSA9IFwiZW5hYmxlXCJcJyBlY2hvIFwnc3NsLnVzZS1zc2x2MiA9IFwiZGlzYWJsZVwiXCdgIGVjaG8gXCd7WyYqJl19c3NsLnVzZS1zc2x2MyA9IFwiZGlzYWJsZVwiXCcKXCI7e1smKiZdfQ=={!{/code}!}

Restart:

{!{code}!}czozNTpcIiBzdWRvIHNlcnZpY2Ugc3ctY3Atc2VydmVyIHJlc3RhcnQKXCI7e1smKiZdfQ=={!{/code}!}

The following improvement has been made:

[*] Administrators can now set a server-wide limit on the number of scheduled backups that can be stored in one repository. The limits of all subscriptions and accounts are reduced to the server-wide value, if such a value is specified. The newly created subscriptions and accounts will have the specified limit by default. Users cannot set a greater limit than the server-wide one. (PPP-10831)

The following issues have been resolved:

[-]  If users logged in using rsession, the Plesk interface language was English, even if these users previously selected another language in Interface Settings. (PPP-11069)
[-] (Linux) In Plesk 12.0, temporary backup files were stored in /tmp by default. This could cause the server not to respond if the size of backup files was bigger than the size of the directory. Temporary backup files are now stored in /usr/local/psa/PMM/tmp. (PPP-11008)
[-] (Linux) After the user had enabled the Atomic rule set for ModSecurity (web application firewall), ModSecurity (web application firewall) stopped working. (PPP-11007)
[-] Users could not restore the default DNS zone settings for domain aliases. The Restore the DNS Zone form did not appear. (PPP-10974)
[-] (Linux) Plesk installed on OpenVZ containers could not be configured after the upgrade to 12.0 because of the missing directory /dev/shm. (PPP-10830, PPPM-1655)
[-] (Linux) The Awstats statistics of the last day of the month was calculated incorrectly. (PPP-8850, PPPM-1486)

The following issues have been resolved:

[-] Users could not access the website folder for managing files of the website if Classic List was selected in Websites & Domains > Domains List Settings. The following error occurred: “Invalid URL was requested”. (PPP-10818)
[-] (Linux) Administrators could not create a backup of the server. The error message about the wrong format of the backup file appeared. (PPP-10804)
[-] The administrator’s interface language switched back to default (English) after visiting the Tools & Settings > Backup Manager > Scheduled Backup Setting screen. (PPP-10784, PPPM-1738)
[-] If users customized their domain PHP settings and then the administrator modified other settings on their subscription, the domain PHP setting changed back to default. (PPP-10744, PPPM-1779)
[-] (Linux) Administrators could not migrate reseller’s subscriptions without migrating the reseller. (PPP-10691, PPPM-1754)
[-] (Windows) On Windows 2012 x64, Plesk administrators could not install a Plesk license key on Plesk inside a Hyper-V virtual machine. The error saying that the license key is invalid occurred.
[-] (Windows) Administrators could not migrate domains with a remote MSSQL database if the MSSQL server was running on any port other than default 1433. (PPP-10800, PPPM-1802)

The following functionality was improved:

[*]Security improvements (http://kb.parallels.com/en/122245)

Important: Regular updates of Parallels Plesk Panel and third-party components guarantee that your server stays secure against malicious attacks.

The following issues have been resolved:

[-] If Plesk was installed without a DNS service, administrators could not create subscriptions. The following error occurred: “Call to a member function isNeedUpdate() on a non-object in /opt/psa/admin/plib/PhDomain.php”. (PPP-10817)
[-] (Linux) Administrators could not upgrade the Plesk server to the version 12.0 from an earlier version if they had the mod_security package installed on the server. The following error occurred: “You have already installed the mod_security package which is not from Panel distribution. You should deinstall the mod_security package before the ‘modsecurity’ component installation, otherwise your Apache web-server will be broken”. (PPP-10791, PPPM-1798)
[-] Users could not access the File Manager if Classic List was selected in Websites & Domains > Domains List Settings. The following error occurred: “Invalid URL was requested”. (PPP-10783, PPPM-1795)
[-] Users could not see status messages for extensions. (PPP-10776)
[-] Users could not restore from an FTP repository any backup created on the same Plesk server unless they selected the option Restore the backup file despite a corrupted signature. The Restore button was inactive. (PPP-10767)
[-] (Linux) On openSuSE 13.1 x32, after a server restart, the FTP service stopped working. (PPP-10750)
[-] (Linux) Temporary files of messages were not removed from the /usr/local/psa/handlers/spool/ directory if greylisting spam protection was switched on. This might cause a lack of disk space. (PPP-10705, PPPM-1766)
[-] Users could not see some form validation messages when Japanese was selected as Plesk interface language. (PPP-10702, PPPM-1763)
[-] Users could not change hosting settings for the main domain on their subscription if there were a lot of additional domains, subdomains, and/or domain aliases. The following error message was shown: “This operation is taking too long. Check the results in a few minutes”. (PPP-10698, PPPM-1762)
[-] (Windows) Administrators could not restore file permissions in the webspace with the repair.exe utility. It repaired only folder permissions. (PPP-10729, PPPM-1745)