TL;dr Vulnerabilities can often be found in places we don’t expect, and CVE-2022-24547 in CastSrv.exe is one of the examples. CVE-2022-24547 is a privilege escalation vulnerability in CastSrv.exe, allowing attackers to bypass security and gain elevated privileges. We’ll break down how the bug works, its exploitation, and how to protect against it. Summary Vendor Microsoft Security Impact Elevation of Privilege CVE ID CVE-2022-24547 CVSS3....
Introduction As promised, we are releasing the firmware and this post for the Off-By-One badge about one month after the event, allowing interested participants the opportunity to explore it. If you’re interested in learning more about the badge design process, please let us know. We were thrilled to introduce the Octopus Badge at the first-ever Off-By-One Conference 2024. The badge was a one of the highlight at the conference, as it included hardware-focused CTF challenges....
Earlier this year, in mid-January, you might have come across this security announcement by GitHub. In this article, I will unveil the shocking story of how I discovered CVE-2024-0200, a deceptively simple, one-liner vulnerability which I initially assessed to likely be of low impact, and how I turned it into one of the most impactful bugs in GitHub’s bug bounty history. Spoiler: The vulnerability enabled disclosure of all environment variables of a production container on GitHub....
Introduction Wi-Fi routers have always been an attractive target for attackers. When taken over, an attacker may gain access to a victim’s internal network or sensitive data. Additionally, there has been an ongoing trend of attackers continually incorporating new router exploits into their arsenal for use in botnets, such as the Mirai Botnet. Consumer grade devices are especially attractive to attackers, due to many security flaws in them. Devices with lower security often contain multiple bugs that attackers can exploit easily, rendering them vulnerable targets....
Introduction The prevalence of memory corruption bugs persists, posing a persistent challenge for exploitation. This increased difficulty arises from advancements in defensive mechanisms and the escalating complexity of software systems. While a basic proof of concept often suffices for bug patching, the development of a functional exploit capable of bypassing existing countermeasures provides valuable insights into the capabilities of advanced threat actors. This holds particularly true for the scrutinized driver, cldflt....
Back in January 2023, I tasked one of our web security interns, River Koh (@oceankex), to perform n-day analysis of CVE-2022-46164 as part of his internship with STAR Labs. The overall goal is to perform an objective assessment of the vulnerability based on the facts gathered. In addition, I challenged him to reproduce the vulnerability without referencing any other materials besides the textual contents of the official advisory by NodeBB....
Brief I may have achieved successful exploitation of a SharePoint target during Pwn2Own Vancouver 2023. While the live demonstration lasted only approximately 30 seconds, it is noteworthy that the process of discovering and crafting the exploit chain consumed nearly a year of meticulous effort and research to complete the full exploit chain. This exploit chain leverages two vulnerabilities to achieve pre-auth remote code execution (RCE) on the SharePoint server: Authentication Bypass – An unauthenticated attacker can impersonate as any SharePoint user by spoofing valid JSON Web Tokens (JWTs), using the none signing algorithm to subvert signature validation checks when verifying JWT tokens used for OAuth authentication....