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Arbitrary process termination from exposed minifilter communication port
Fortinet FortiClient Windows fortimon3 driver flaw (CVSS 4.7) lets authenticated attackers terminate arbitrary processes via exposed minifilter communication port.
Fortinet advisory FG-IR-26-165 discloses an unverified ownership vulnerability (CWE-283, CVSSv3 4.7) in the FortiClient Windows fortimon3 minifilter driver. An authenticated attacker can terminate arbitrary processes through an exposed minifilter communication port. The advisory was revised on 2026-09-08.
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Redtail Payload Analysis [Guest Diary], (Wed, Sep 9th)
SANS guest analyst detonated a RedTail Linux sample from a DShield honeypot, finding process masquerading as php-fpm, monitoring-kill behavior, and a TCP listener.
A DShield honeypot captured multi-architecture RedTail Linux executables (ARM, ARM64, i686, RISC-V, x86-64) deployed via shell scripts. Dynamic analysis of the UPX-packed, statically linked x86-64 sample (SHA-256 63be5f38...d35e) in an isolated Ubuntu 24.04 VM on Proxmox showed it renamed its process via prctl(PR_SET_NAME), killed a filesystem-monitoring process, and opened a TCP listening socket while surviving processes posed as php-fpm or PostgreSQL-like workers. Differential memory images pre- and post-execution were captured from the hypervisor for forensics.
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Xen Security Advisory 509 v3 (CVE-2026-62437) - x86: DMs may cause mem leak by IRQ binding
Xen Project released XSA-509 (CVE-2026-62437) fixing a memory leak in IRQ tracking when guests with assigned PCI devices are terminated.
Xen Security Advisory 509 v3 publicly discloses CVE-2026-62437, a memory leak affecting the Xen hypervisor on x86. When guests are terminated, cleanup of PCI devices assigned to those guests and removal of associated IRQ tracking structures may fail, leaking memory. The advisory was released publicly as version 3.
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