Entries by Hans-Petter Fjeld

Supply chain attacks and Zero-days

The year 2021 has seen several high profiled vulnerabilities being actively exploited in bigand popular software, including Microsoft Exchange and Solar Winds Orion. Experience shows that in some cases it is too late to patch even after a few days.Many organizations work with the guideline of patching within 30 days, if the vendor states theupdate […]

Centreon IT monitoring software and Russian Sandworm hackers

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 […]

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

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 […]

Don’t get caught in the cold with ransomware

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 […]

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

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 […]

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

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 […]

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

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 […]

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

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 […]