Silk Typhoon is a Chinese state actor focused on espionage campaigns targeting a wide range of industries in the US and throughout the world. In recent months, Silk Typhoon has shifted to performing IT supply chain attacks to gain access to targets. In this blog, we provide an overview of the threat actor along with insight into their recent activity as well as their longstanding tactics, techniques, and procedures (TTPs), including a persistent interest in the exploitation of zero-day vulnerabilities in various public-facing appliances and moving from on-premises to cloud environments.
A stack-based buffer overflow in Ivanti Connect Secure before version 22.7R2.5, Ivanti Policy Secure before version 22.7R1.2, and Ivanti Neurons for ZTA gateways before version 22.7R2.3 allows a remote unauthenticated attacker to achieve remote code execution.
We agree - modern security engineering is hard - but none of this is modern. We are discussing vulnerability classes - with no sophisticated trigger mechanisms that fuzzing couldnt find - discovered in the 1990s, that can be trivially discovered via basic fuzzing, SAST (the things product security teams do with real code access).
As an industry, should we really be communicating that these vulnerability classes are simply too complex for a multi-billion dollar technology company that builds enterprise-grade, enterprise-priced network security solutions to proactively resolve?
Zero-day exploitation of Ivanti Connect Secure VPN vulnerabilities since as far back as December 2024.
On Wednesday, Jan. 8, 2025, Ivanti disclosed two vulnerabilities, CVE-2025-0282 and CVE-2025-0283, impacting Ivanti Connect Secure (“ICS”) VPN appliances. Mandiant has identified zero-day exploitation of CVE-2025-0282 in the wild beginning mid-December 2024. CVE-2025-0282 is an unauthenticated stack-based buffer overflow. Successful exploitation could result in unauthenticated remote code execution, leading to potential downstream compromise of a victim network.
On Wednesday, January 8, 2025, Ivanti disclosed two CVEs affecting Ivanti Connect Secure, Policy Secure, and Neurons for ZTA gateways. CVE-2025-0282 is a stack-based buffer overflow vulnerability that allows remote, unauthenticated attackers to execute code on the target device. CVE-2025-0283 is a stack-based buffer overflow that allows local authenticated attackers to escalate privileges on the device.
