Remote Denial-of-Service on CycloneTCP : CVE-2021-26788

This post is a quick vulnerability report summary for a vulnerability we found while fuzzing the TCP/IP stack CycloneTCP.

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Analysis of a Windows IPv6 Fragmentation Vulnerability: CVE-2021-24086

In this blog post we analyze a denial of service vulnerability affecting the IPv6 stack of Windows. This issue, whose root cause can be found in the mishandling of IPv6 fragments, was patched by Microsoft in their February 2021 security bulletin.

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Bad Neighbor on FreeBSD: IPv6 Router Advertisement Vulnerabilities in rtsold (CVE-2020-25577)

This blog post provides details about four vulnerabilities we found in the IPv6 stack of FreeBSD, more specifically in rtsold(8), the router solicitation daemon. The bugs affected all supported versions of FreeBSD, and the most severe of them could allow an attacker attached to the same physical link to gain remote code execution as root on vulnerable systems. The vulnerabilities were discovered and reported to FreeBSD Security Team in November 2020. FreeBSD issued fixes for these bugs on December 1st, 2020 along with security advisory FreeBSD-SA-20:32.rtsold.

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Playing Around With The Fuchsia Operating System

A look at the new Fuchsia Operating System.

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Vulnerabilities in High Assurance Boot of NXP i.MX microprocessors

This blog post provides details about two vulnerabilities found by Quarkslab's researchers Guillaume Delugré and Kévin Szkudłapski in the secure boot feature of the i.MX family of application processors built by NXP Semiconductors.

The bugs allow an attacker to subvert the secure boot process to bypass code signature verification and load and execute arbitrary code on i.MX application processors that have the High Assurance Boot feature enabled. These bugs affect 12 i.MX processor families.

The vulnerabilities were discovered and reported to the vendor in September 2016 and the technical details included in this blogpost were disclosed in a joint Quarkslab-NXP presentation at the Qualcomm Mobile Security Summit 2017 in May 19th, 2017. National computer emergency response teams (CERTs) from 4 countries were informed about the issues in March, 2017.

NXP has issued an Engineering Bulletin and two Errata documents (EB00854, ERR010872 and ERR0108873 respectively) providing a brief description of both vulnerabilities, the list of affected processor models along with resolution plans and possible mitigations.

In the rest of the blogpost we describe the relevant features in i.MX processors and the vulnerabilities affecting them.

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Security Assessment of OpenVPN

Quarkslab was hired by OSTIF to perform a security assessment of OpenVPN 2.4.0. We focused on code and cryptography assessment. Results are briefly described in this blog post, and full report is available at its end.

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