Security Blog

WSUS Attacks Part 1: Introducing PyWSUS

Windows Updates are AvailableAt GoSecure, we work hard to illustrate the impact of our pentest findings on our clients’ security posture. In the past few years, we found numerous organizations with vulnerable Windows Server Update Services (WSUS) deployments. However, no tool (reliable enough to use during engagements) was available to show to clients the risks associated with this critical vulnerability. For these reasons, in the next series of blog posts, we will describe the vulnerability, explore its attack vectors and release new tools to weaponize the vulnerability, and subsequently, demonstrate its impact.

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Slipups in Cybersecurity: Defenders’ and Attackers’ Perceptions on Security Measures

Attack VectorsAs part of our research on Cybersecurity Perceptions Versus Reality, we developed a survey in collaboration with Serene-risc, a knowledge mobilization network in cybersecurity based in Canada, on the perceptions and practices of cybersecurity professionals. The survey aimed at understanding how defenders perceive specific security measures and whether these measures were implemented in their respective organizations. We then combined the survey results with our penetration testing experience to confront two perspectives: the defenders’ and the pentesters’, the latter standing as proxies for real attackers. After finding incongruities in the survey results and the penetration testers’ experience, summarized in a series of blogposts, we then compared perceived organizational security maturity versus implemented security measures. We also compiled the top 10 vulnerabilities/missing controls found in 65 penetration testing reports. This blog post summarizes the findings of these two analyses, which uncover potential biases in the defenders’ mindset and important information gaps. It also provides a list of pro-tips to overcome the most common attack vectors found during penetration tests.

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Forget Your Perimeter:
RCE in Pulse Connect Secure (CVE-2020-8218)

RCE Blog PostA vulnerability discovered by GoSecure on Pulse Secure Connect, an SSL VPN, allows an authenticated user to run arbitrary code remotely (RCE). The RCE requires to have admin privileges but can also be triggered by an unsuspecting victim simply clicking on a malicious link. Several other vulnerabilities of varying severities were also found and disclosed, however only the RCE was fixed as of version 9.1R8 and will therefore be the focus of this blog post. We will release the details of the remaining vulnerabilities in a later blog post.

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Endpoint Visibility: Discrepancies in Defenders’ Perception and Pentesters’ Experience

Endpoint VisibilityAs part of our research on Cybersecurity Perceptions Versus Reality, we developed a survey in collaboration with Serene-risc, a knowledge mobilization network in cybersecurity based in Canada, on the perceptions and practices of cybersecurity professionals. The survey aimed at understanding how defenders perceive specific security measures and whether these measures were implemented in their respective organizations. We then combined the survey results with our penetration testing experience to confront two perspectives: the defenders’ and the pentesters’, the latter standing as proxies for real attackers. This blog post summarizes the results related to endpoint visibility.

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Asset Inventories: Stay Up to Date!

Asset InventoriesHaving an asset inventory is a common security practice. Yet, keeping that inventory up to date seems to be less common. GoSecure penetration testers report encountering unmaintained asset inventories quite often, allowing them to exploit forgotten servers hosting known vulnerabilities. This blog post highlights findings related to asset inventory maintenance uncovered through our research on Cybersecurity Perceptions Versus Reality.

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