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Citrix releases new patches, racing with the hackers that install encryptors on vulnerable machines

Destructive race: Citrix releases new patches, and hackers are actively attacking vulnerable servers and installing encryption engines on them. It seems that users are losing.

At the beginning of this year was discovered CVE-2019-19781 vulnerability, which affects a number of versions of Citrix Application Delivery Controller (ADC), Citrix Gateway, as well as two old versions of Citrix SD-WAN WANOP. As was reported at the beginning of the month, there were exploits for it in the public domain.

After the publication of the exploits, attacks on vulnerable versions of Citrix intensified, just as it was expected, as numerous hackers hope to compromise some important goal that did not have time to upgrade – a corporate network, a state server, or a government agency.

“The main problem was that though more than a month has passed since the vulnerability was discovered, Citrix developers were in no hurry to release the patch”, – IS experts condemn the company.

Firstly, company limited itself to only safety recommendations, explaining to customers how to reduce risks.

There was even an interesting precedent – an unknown hacker used vulnerable methods to patch vulnerable Citrix servers and, according to information security analysts, not because he was Robin Hood, his intentions were dubious.

Citrix developers presented an actual patch only last week, and did not release the final patches untill the last Friday.

Citrix and FireEye experts also provided free solutions to identify compromises and vulnerable systems.

Now FireEye and Under the Breach analysts are warning that cryptographic operators REvil (Sodinokibi) and Ragnarok are actively infecting vulnerable Citrix servers, which are still numerous.

“I examined the files REvil posted from Gedia.com after they refused to pay the ransomware. The interesting thing I discovered is that they obviously hacked Gedia via the Citrix exploit. My bet is that all recent targets were accessed via this exploit. It just goes to show how much impact a single exploit could have. Other files included invoices, data structures and a complete dump of the servers passwords. GDPR will go hard on these guys and this is exactly what REvil wants, the incentive to ransomware is truly alive!”, — writes Under the Breach company representative.

Additionally, according to unconfirmed reports, the creators of the Maze ransomware targeted vulnerable systems.

It is necessary to say that overall the process of installing patches is going well. If in December 2019 the number of vulnerable systems was estimated at 80,000 servers, then in mid-January their number dropped to about 25,000, and last week it fell below 11,000 systems altogether. Specialists from the GDI Foundation closely monitor these statistics.

About Vladimir Krasnogolovy

Vladimir is a technical specialist who loves giving qualified advices and tips on GridinSoft's products. He's available 24/7 to assist you in any question regarding internet security.

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