securelist Oct 27, 2026 · Crawled Nov 2, 2026

An insecure neighbor: how a vulnerability chain led to an isolation bypass in cloud infrastructure

2 IoCs 1 CVEs

AI Summary

A penetration test on a major cloud provider revealed a chain of vulnerabilities that enabled complete bypass of tenant isolation. Initial access was gained via misconfigured Kubernetes worker nodes, allowing escape to the host. This was followed by exploitation of Konnectivity to achieve remote code execution on the control plane, privilege escalation using an OverlayFS vulnerability, and lateral movement across managed services including VictoriaMetrics, Kafka, Redis, PostgreSQL, and SaltStack. The attack chain ultimately allowed access to sensitive credentials, control of other tenants' resources, and full compromise of the cloud infrastructure through misconfigurations and logic flaws in multiple components.

AI-extracted · verify before operational use

Extracted Entities 1 found

CVE CVE-2026-25243 →

Indicators of Compromise 2 extracted

Type	Value	Detail
IP	100[.]64[.]13[.]37	Details →
IP	192[.]0[.]2[.]1	Details →

MITRE ATT&CK TTPs 17 techniques

T1003 OS Credential Dumping · Credential Access T1055 Process Injection · Defense Evasion T1059 Command and Scripting Interpreter · Execution T1068 Exploitation for Privilege Escalation · Privilege Escalation T1069 Permission Groups Discovery · Discovery T1075 T1075 T1078 Valid Accounts · Defense Evasion T1081 T1081 T1083 File and Directory Discovery · Discovery T1087 Account Discovery · Discovery T1098 Account Manipulation · Persistence T1105 Ingress Tool Transfer · Command And Control T1134 Access Token Manipulation · Defense Evasion T1203 Exploitation for Client Execution · Execution T1210 Exploitation of Remote Services · Lateral Movement T1484 Domain or Tenant Policy Modification · Defense Evasion T1552 Unsecured Credentials · Credential Access