Basefarm Blog – Security, Cloud and Big Data

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0-days in Microsoft exchange servers

March 3, 2021/in Security blog /by Rebecca Mybrand

Published: 2021-03-02CVE-2021-26855CVE-2021-26857CVE-2021-26858 CVE-2021-27065 “Microsoft has detected multiple 0-day exploits being used to attack on-premises versions of Microsoft Exchange Server in limited and targeted attacks. In the attacks observed, the threat actor used these vulnerabilities to access on-premises Exchange servers which enabled access to email accounts, and allowed installation of additional malware to facilitate long-term access to […]

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Centreon IT monitoring software and Russian Sandworm hackers

February 16, 2021/in Security blog /by Hans-Petter Fjeld

Basefarm has become aware of published news telling of Russian-accredited advanced persistent threat actors, given the name of Sandworm, having exploited Centreon IT monitoring software. Basefarm is aware that some news report mention Orange as on the customer-list of Centreon and while Basefarm is owned by Orange Business Services we would like to make it […]

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Microsoft Windows Multiple Security Updates Affecting TCP/IP | CVE-2021-24074, CVE-2021-24094, and CVE-2021-24086

February 10, 2021/in Vulnerability bulletin /by Hans-Petter Fjeld

Published: 2021-02-09MITRE CVE-2021-24074MITRE CVE-2021-24094MITRE CVE-2021-24086 “Microsoft released a set of fixes affecting Windows TCP/IP implementation that include two Critical Remote Code Execution (RCE) vulnerabilities (CVE-2021-24074, CVE-2021-24094) and an Important Denial of Service (DoS) vulnerability (CVE-2021-24086). The two RCE vulnerabilities are complex which make it difficult to create functional exploits, so they are not likely in the […]

Mikael Karlsson

Don’t get caught in the cold with ransomware

February 8, 2021/in Security blog /by Hans-Petter Fjeld

Ransoms is sadly the trend these days. We want to share a cheap and effective way to enable prevention that most probably fail to consider. Using the ransomware simulator from KnowBe4, RanSim, we could see that our endpoints did no prevention previously. An easy way to minimize the attack surface for ransomware is to use […]

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CVE-2021-3156 | Heap-Based Buffer Overflow in Sudo

January 27, 2021/in Vulnerability bulletin /by Hans-Petter Fjeld

Published: 2021-01-26MITRE CVE-2021-3156 “The Qualys Research Team has discovered a heap overflow vulnerability in sudo, a near-ubiquitous utility available on major Unix-like operating systems. Successful exploitation of this vulnerability allows any unprivileged user to gain root privileges on the vulnerable host.” This is especially bad for multi-user environments where some users have login access, but […]

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SolarWinds Supply Chain Attack to Compromise Victims With SUNBURST Backdoor

December 16, 2020/in Security blog /by Hans-Petter Fjeld

There is an ongoing news-story concerning SolarWinds and a supply chain attack used by an advanced threat actor to compromise victims with a rather advanced backdoor. Basefarm does not use this affected product, but are aware of at least one of our customer who do. We are working with the customer in question to mitigate […]

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CVE-2020-17095 | Windows Hyper-V Remote Code Execution Vulnerability

December 11, 2020/in Vulnerability bulletin /by Hans-Petter Fjeld

Published: 2020-12-08MITRE CVE-2020-17095 “A remote code execution vulnerability exists when Windows Hyper-V on a host server fails to properly validate input from an authenticated user on a guest operating system. To exploit this vulnerability, an attacker could run a specially crafted application on a Hyper-V guest that could cause the Hyper-V host operating system to […]

NSA publishes advisory on 25 vulnerabilities used by Chinese state sponsored hackers

October 23, 2020/in Basefarm SIRT, Security blog, SIRT /by Raymond Aarseth

The National security Agency in the United States recently released an advisory warning of the threat of Chinese state sponsored attacks and detailed 25 vulnerabilities used. The advisory gives detailed information about the vulnerabilities, what it affects and how to remediate them. Most of them are remotely exploited and can be used to gain initial […]

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CVE-2020-16891 | Windows Hyper-V Remote Code Execution Vulnerability

October 14, 2020/in Vulnerability bulletin /by Hans-Petter Fjeld

Published: 2020-10-13MITRE CVE-2020-16891 “A remote code execution vulnerability exists when Windows Hyper-V on a host server fails to properly validate input from an authenticated user on a guest operating system.” This is especially bad for “hotel” environment with multiple different tenants that should not be able to influence each other, but it is also bad […]

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CVE-2020-16898 | Windows TCP/IP Remote Code Execution Vulnerability

October 14, 2020/in Vulnerability bulletin /by Hans-Petter Fjeld

Published: 2020-10-13MITRE CVE-2020-16898 “A remote code execution vulnerability exists when the Windows TCP/IP stack improperly handles ICMPv6 Router Advertisement packets.” This vulnerability affects Windows 10, Server 2019 and Server Core versions (see full Security Advisory for proper details). It can be mitigated by disabling a network feature or blocking ICMPv6 Router Advertisement packets. Basefarm and […]