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Joomla under attack due to a zero-day. Patch your CMS now!

The websites based on the popular Joomla CMS need to be updated as soon as possible due to a critical remote code execution vulnerability.

The websites based on the popular Joomla CMS need to be updated as soon as possible, Joomla has just released a security patch to fix a critical eight-year-old remote code execution vulnerability. The critical flaw was already exploited in the wild, during the weekend experts at the Sucuri firm observed an alarming increase in the number of attacks.

According to the security expert Daniel Cid from Sucuri, starting from Saturday hundreds of attacks are now taking place.

“What is very concerning is that this vulnerability is already being exploited in the wild and has been for the last 2 days. Repeat: This has been in the wild as a 0-day for 2 days before there was a patch available.” States the blog post published by Sucuri.

“The wave of attacks is even bigger, with basically every site and honeypot we have being attacked [which] means that probably every other Joomla site out there is being targeted as well.”

The zero-day flaw could have a significant impact on the Internet users considering that Joomla is the most popular content management system having been downloaded more than 50 million times.

According to a security advisory published by Joomla, all versions above 1.5 are affected. It is important to update the CMS version to the patched version 3.4.6.

“Browser information is not filtered properly while saving the session values into the database which leads to a remote code execution vulnerability,” it says.

Sucuri is inviting users to protect their websites and looking for possible indicators od compromise. The attackers are running object injection through the HTTP user agent with exploits from the IP address 74.3.170.33, 146.0.72.83, and 194.28.174.106.

“If you are a Joomla user, check your logs right away. Look for requests from 146.0.72.83 or 74.3.170.33 or 194.28.174.106 as they were the first IP addresses to start the exploitation. I also recommend searching your logs for “JDatabaseDriverMysqli” or “O:” in the User Agent as it has been used in the exploits. If you find them, consider your Joomla site compromised and move to the remediation / incident response phase.” States Sucuri.

Don’t waste time, check log and update your Joomla version asap.

Pierluigi Paganini

(Security Affairs – CMS, hacking)

Pierluigi Paganini

Pierluigi Paganini is member of the ENISA (European Union Agency for Network and Information Security) Threat Landscape Stakeholder Group and Cyber G7 Group, he is also a Security Evangelist, Security Analyst and Freelance Writer. Editor-in-Chief at "Cyber Defense Magazine", Pierluigi is a cyber security expert with over 20 years experience in the field, he is Certified Ethical Hacker at EC Council in London. The passion for writing and a strong belief that security is founded on sharing and awareness led Pierluigi to find the security blog "Security Affairs" recently named a Top National Security Resource for US. Pierluigi is a member of the "The Hacker News" team and he is a writer for some major publications in the field such as Cyber War Zone, ICTTF, Infosec Island, Infosec Institute, The Hacker News Magazine and for many other Security magazines. Author of the Books "The Deep Dark Web" and “Digital Virtual Currency and Bitcoin”.