KIRO VPN CLIENT UPGRADE
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KIRO VPN CLIENT VERIFICATION

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SEC Consult provided a proof of concept exploit script to GFI but it has been removed from this advisory in order to give customers more time to upgrade the infrastructure. inject content into the encrypted stream, while keeping the resulting checksum identical. Assuming an attacker knows the plaintext data of a datagram and is able to modify its ciphertext, it is trivial to change parts of the message, e.g. More precisely, bits that are flipped in the ciphertext result in the same bits being flipped in the plaintext after decryption.Įach encrypted UDP datagram contains a simple checksum (the same checksum used by IPv4). Each of these packets is encrypted using Blowfish in CTR mode.Īs this mode does not provide data authenticity, encrypted data that is modified by an attacker results in predictable modification of the plaintext. We want to explicitly thank GFI for the professional handling of the communication during this whole process.Īfter a TLS connection is established between the Kerio VPN client and the Kerio Control appliance and cryptographic keys have been securely transferred over this connection, the data sent through the VPN is transmitted in UDP packets. In addition to the vulnerabilities described here, we already identified critical vulnerabilities in Kerio Control in 2016. Hence we suspect there are more major security deficiencies in the product. We therefore recommend GFI software to greatly increase the efforts towards product security in order to keep customers secure.

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Note that no full audit of Kerio Control, Kerio VPN or the cryptographic protocol has been conducted. We therefore recommend businesses to switch from Kerio’s proprietary VPN protocol to a standard protocol (Kerio Control e.g. Therefore, many design issues with these protocols have already been detected and mitigated since. Due to their widespread use, they generally receive much greater attention by experts. Generally, SEC Consult strongly recommends to prefer well-established standard cryptographic protocols rather than proprietary protocols wherever possible (e.g.

KIRO VPN CLIENT VERIFICATION

Or, use industry-standard IPsec/L2TP for connectivity from mobile devices or third-party firewalls. Enable 2-step verification for an extra layer of security on all forms of remote access.”ĭuring a quick evaluation of the Kerio Control VPN protocol, it was apparent, that the cryptographic protocol employed exhibited severe design issues. “ Link headquarters to remote users and branch offices securely and easily. Kerio’s own VPN tunneling with dead-simple setup requires minimal configuration, and provides a high performance network connection.

These comprehensive capabilities and unmatched deployment flexibility make Kerio Control the ideal choice for small and mid-sized businesses.” “ Kerio Control brings together next-generation firewall capabilities - including a network firewall and router, intrusion detection and prevention (IPS), gateway anti-virus, VPN, and web content and application filtering. “ Protect your network from viruses, malware and malicious activity with Kerio Control, the easy-to-administer yet powerful all-in-one security solution.

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