Kaseya patches VSA vulnerabilities used in REvil ransomware attack


Kaseya has actually launched a protection upgrade for the VSA zero-day vulnerabilities used by the REvil ransomware gang to attack MSPs as well as their clients.

Kaseya VSA is a remote administration as well as tracking service typically used by handled company to sustain their clients. MSPs can release VSA on-premise utilizing their web servers or make use of Kaseya’s cloud-based SaaS service.

In April, the Dutch Institute for Vulnerability Disclosure ( DIVD) divulged 7 vulnerabilities to Kaseya:

  • CVE-2021-30116 – A qualifications leakage as well as organization reasoning defect, to be consisted of in 9.5.7
  • CVE-2021-30117 – An SQL shot susceptability, fixed in May 8th spot.
  • CVE-2021-30118 – A Remote Code Execution susceptability, fixed in April 10th spot. (v9.5.6)
  • CVE-2021-30119 – A Cross Site Scripting susceptability, to be consisted of in 9.5.7
  • CVE-2021-30120 – 2FA bypass, to be fixed in v9.5.7
  • CVE-2021-30121 – A Local File Inclusion susceptability, fixed in May 8th spot.
  • CVE-2021-30201 – A XML External Entity susceptability, fixed in May 8th spot.

Kaseya had actually executed patches for the majority of the vulnerabilities on their VSA SaaS solution yet had actually not finished the patches for the on-premise variation of VSA.

Unfortunately, the REvil ransomware gang beat Kaseya to the goal as well as made use of these vulnerabilities to introduce an enormous attack on July 2nd versus roughly 60 MSPs utilizing on-premise VSA web servers as well as 1,500 organization clients.

It is uncertain which vulnerabilities were used in the attack, yet it is thought to be one or a mix of CVE-2021-30116, CVE-2021-30119, as well as CVE-2021-30120.

Kaseya launches safety and security updates

Since the attack, Kaseya has actually advised on-premise VSA clients to close down their web servers up until a spot prepares.

Almost 10 days after the assaults, Kaseya has released the VSA 9.5.7a ( update to repair the vulnerabilities used in the REvil ransomware attack.

With this launch, Kaseya has actually dealt with the adhering to vulnerabilities:

  • Credentials leakage as well as organization reasoning defect: CVE-2021-30116
  • Cross Site Scripting susceptability: CVE-2021-30119
  • 2FA bypass: CVE-2021-30120
  • Fixed a concern where safe and secure flag was not being used for User Portal session cookies.
  • Fixed a concern where particular API reactions would certainly consist of a password hash, possibly revealing any kind of weak passwords to strengthattack The password worth is currently covered up totally.
  • Fixed a susceptability that might enable unapproved upload of data to the VSA web server.

However, Kaseya is prompting clients to adhere to the ‘On Premises VSA Startup Readiness Guide‘ actions prior to mounting the upgrade to stop additional violations as well as ensure tools are not currently endangered.

Below are the standard actions that admins must do prior to launching VSA web servers once again as well as linking them to the Internet:

  • Ensure your VSA web server is separated
  • Check System for Indicators of Compromise (IOC)
  • Patch the Operating Systems of the VSA Servers
  • Using URL Rewrite to regulate accessibility to VSA via IIS
  • Install FireEye Agent
  • Remove Pending Scripts/Jobs

Of these actions, it is essential that on-premise VSA web servers not be openly easily accessible from the Internet to stop concession while mounting the spot.

Kaseya additionally advises clients to use their “Compromise Detection Tool,” a collection of PowerShell manuscripts to identify whether a VSA web server or endpoints have actually been endangered.

The manuscripts will certainly inspect VSA web servers for the visibility of ‘Kaseyawebpagesmanagedfilesvsaticketfilesagent crt’ as well as ‘Kaseyawebpagesmanagedfilesvsaticketfilesagent exe,’ as well as ‘agent.crt’ as well as ‘agent.exe’ on endpoints.

The REvil associate used the agent.crt as well as agent.exe data to release the REvil ransomware executable.

For added safety and security, Kaseya is additionally recommending on-premise VSA admin limit accessibility to the internet GUI to neighborhood IP addresses as well as those recognized to be used by safety and security items.

“For VSA On-Premises installations, we have recommended limiting access to the VSA Web GUI to local IP addresses by blocking port 443 inbound on your internet firewall.  Some integrations may require inbound access to your VSA server on port 443.  Below are a list of IP addresses you can whitelist in your firewall (allow 443 inbound to FROM ), if you are using these integrations with your VSA On-Premises product.” explains Kaseya

After mounting the spot, all individuals will certainly be called for to alter their password to one utilizing brand-new password needs.

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