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Introduction: The Invisible Threat Hiding Inside Trusted Cloud Systems
Cloud computing has transformed the way organizations build, operate, and protect their digital infrastructure. Enterprises, governments, and critical industries increasingly depend on platforms like Microsoft Azure and Google Cloud Platform to manage massive workloads, sensitive information, and complex applications.
But behind the convenience of managed cloud services lies a growing security challenge: trust itself can become a vulnerability.
A new wave of research has revealed that decades-old security weaknesses known as “confused deputy” flaws are still affecting modern cloud architectures. These vulnerabilities exploit a dangerous mistake in identity management, where a highly privileged service unknowingly performs actions on behalf of an attacker.
Security researcher Justin O’Leary has uncovered examples of this issue inside Microsoft Azure and Google Cloud Platform, demonstrating that attackers could potentially abuse trusted cloud components to gain administrative privileges without directly breaking traditional security controls.
The discovery highlights a deeper concern for the cybersecurity industry: even the world’s most advanced cloud platforms can struggle with the complexity of modern identity chains.
The Return of an Old Security Problem in the Modern Cloud Era
The concept of a confused deputy vulnerability is not new. The term was introduced by computer scientist Norm Hardy in 1988 after identifying a flaw in a commercial time-sharing system developed by Tymshare.
The original idea was simple but powerful: a system with more authority than a user can be tricked into using its own privileges against the user’s intended purpose.
Nearly four decades later, the same problem continues to appear in cloud environments.
Modern platforms have thousands of interconnected services, APIs, automation systems, and identity relationships. While these systems provide flexibility and scalability, they also create complicated trust chains where one mistake can allow attackers to move from limited access to complete control.
The problem is no longer only about passwords or stolen credentials. It is about whether cloud services correctly understand who is making a request, why the request exists, and whether that request should be trusted.
Why Confused Deputy Vulnerabilities Are Dangerous
Traditional security models assume that a privileged service will carefully validate every request before taking action.
However, a confused deputy vulnerability occurs when a service receives a request from a lower-privileged user but performs the action using its own powerful permissions.
The attacker does not need to steal administrator credentials.
Instead, they manipulate a trusted service into becoming the attacker’s assistant.
This creates several serious risks:
Unauthorized privilege escalation
Cloud resource takeover
Sensitive data exposure
Malware deployment
Long-term persistence inside enterprise environments
The most dangerous aspect is that the attack can appear legitimate because the trusted service itself performs the action.
Azure Kubernetes Service Flaw Allowed Cluster Admin Escalation
One of O’Leary’s discoveries involved Microsoft Azure Kubernetes Service (AKS) backup functionality.
Azure uses a feature called Trusted Access, which allows backup vaults to communicate with Kubernetes clusters through assigned permissions.
The security researcher discovered that an attacker with only Backup Contributor permissions could potentially abuse the backup system’s trust relationship.
Normally, a Backup Contributor should have no Kubernetes administrative capabilities.
However, through the confused deputy weakness, an attacker could potentially escalate privileges and gain cluster-admin access.
With cluster administrator permissions, an attacker could:
Extract sensitive backup information
Modify Kubernetes workloads
Deploy malicious containers
Access secrets stored inside clusters
Move deeper into connected cloud environments
A limited account could effectively become a powerful administrator.
Google Cloud Config Connector IAM Bypass Created Invisible Attack Paths
The second vulnerability affected Google Cloud Platform through Config Connector.
Config Connector allows organizations to manage Google Cloud resources using Kubernetes-style configurations.
The tool is widely used because it simplifies cloud infrastructure management.
However, O’Leary discovered that Config Connector failed to properly verify whether a user had permission to assign IAM roles to external organizations.
The attacker only needed basic Kubernetes namespace access.
They could submit an IAMPolicyMember request referencing an external organization, and Config Connector would forward that request using its own elevated credentials.
The result was a potential privilege escalation path from limited Kubernetes access to Google Cloud Organization Owner privileges.
That level of access could allow attackers to control:
Cloud identities
Storage resources
Compute systems
Security settings
Enterprise-wide permissions
The Most Concerning Detail: Attackers Could Become Invisible
One of the biggest concerns surrounding the Google Cloud issue was logging visibility.
Cloud platforms usually rely on audit logs to detect suspicious behavior.
However, because the actions were performed through Config Connector’s service account, the attacker’s activity could appear as legitimate service activity.
This creates a nightmare scenario for security teams.
An attacker could potentially perform administrative operations while leaving behind logs that point toward an internal service rather than the real attacker.
Security monitoring systems may detect nothing unusual.
The attacker becomes hidden behind the identity of the trusted deputy.
Microsoft and Google Response Creates Disclosure Debate
After discovering the vulnerabilities, O’Leary reported his findings to both Microsoft and Google.
The response from both companies created controversy within the cybersecurity community.
According to the researcher, Microsoft appeared to silently patch the Azure issue after discussions with the company and CERT/CC.
While fixing the problem improved security, silent patches create challenges for customers.
Organizations may not know:
Whether they were exposed
Whether they need additional security changes
Whether previous activity should be investigated
Transparency is especially important in cloud security because customers depend on vendors for accurate risk information.
Google Disagreed With the Vulnerability Classification
Google’s response followed a different path.
Initially, the company appeared interested and the researcher expected a bug bounty reward.
However, Google’s Vulnerability Rewards Program later determined that the issue did not qualify as a security vulnerability.
Google reportedly suggested that customers are responsible for correctly configuring permissions.
O’Leary argued that this does not address the core problem.
The concern is not simply whether customers assign permissions correctly.
The concern is whether a trusted cloud component verifies that the person requesting those permissions actually has authority to do so.
The Bigger Industry Problem: Cloud Trust Chains Are Growing Too Complex
The Azure and Google Cloud examples demonstrate a wider industry challenge.
Cloud platforms are becoming ecosystems of connected services.
Organizations use:
Kubernetes
Infrastructure automation
Identity providers
Service accounts
External integrations
Managed connectors
Every connection creates another trust relationship.
Every trust relationship creates another possible attack path.
Security teams must understand not only who has access but also which services can act on behalf of users.
Deep Analysis: Testing and Understanding Confused Deputy Risks
Security researchers and cloud administrators can investigate identity relationships using several defensive approaches.
Reviewing Cloud Identity Permissions
For Azure environments:
az role assignment list \n--all \n--include-inherited \n--output table
This command helps identify excessive permissions assigned across Azure resources.
Auditing Kubernetes Permissions
Administrators can review Kubernetes access:
kubectl auth can-i --list
This reveals what actions a Kubernetes identity can perform.
Checking Service Account Activity
Google Cloud administrators can inspect IAM activity:
gcloud logging read \n"protoPayload.authenticationInfo.principalEmail" \n--limit=50
This helps identify unusual service account behavior.
Reviewing IAM Policies
Google Cloud IAM policies can be inspected with:
gcloud projects get-iam-policy PROJECT_ID
Organizations should regularly check whether external identities have unexpected privileges.
Security Hardening Recommendations
Companies should:
Apply least privilege principles
Separate administrative roles
Restrict service account permissions
Monitor automation identities
Review Kubernetes RBAC settings
Audit cloud connectors regularly
The biggest lesson is simple: trusted services must not automatically become trusted users.
What Undercode Say:
Cloud security has entered a new battlefield where identity is the primary target.
Attackers no longer need to break through firewalls when they can convince trusted systems to open the door themselves.
The confused deputy problem represents a fundamental challenge in modern cloud architecture.
Cloud providers have created extremely powerful automation systems, but power without strict verification creates dangerous opportunities.
The Azure and Google Cloud cases are not just isolated bugs.
They reveal how difficult it is to maintain perfect trust boundaries inside massive cloud ecosystems.
The traditional security model focused on protecting accounts.
The future requires protecting relationships between accounts, services, and automated processes.
Every cloud service that can act on behalf of another identity becomes a potential security bridge.
Organizations often focus on external threats, but internal cloud communication paths can be equally dangerous.
A compromised low-level account may become extremely powerful if it can abuse a privileged service.
The complexity of Kubernetes makes this problem even harder.
Kubernetes was designed for flexibility and automation, but those same features create opportunities for privilege abuse.
Cloud administrators must stop thinking only about user permissions.
They must analyze service permissions.
They must ask:
“Who can this service become?”
“What actions can it perform?”
“Can it verify the original requester?”
The security industry has spent years improving authentication.
However, authorization remains one of the biggest unresolved challenges.
Multi-factor authentication cannot prevent a confused deputy attack.
Strong passwords cannot prevent a trusted service from being manipulated.
The solution requires better identity architecture.
Cloud providers must build stronger verification mechanisms into their managed services.
Customers must adopt stricter privilege separation.
Security teams must monitor service-to-service communication, not just human activity.
The future of cybersecurity will depend on understanding invisible trust relationships.
Attackers are becoming more creative.
Cloud environments are becoming more complicated.
The organizations that survive will be those that treat every identity, including automated ones, as something that must continuously prove its legitimacy.
Prediction
(+1) Cloud security will increasingly move toward identity relationship monitoring, where organizations analyze not only users but also service accounts, automation systems, and cloud connectors. Better security tools will emerge to automatically detect suspicious privilege escalation paths.
(+1) Major cloud providers are likely to improve transparency around confused deputy vulnerabilities as enterprises demand clearer explanations about exposure and mitigation.
(-1) As cloud architectures become more interconnected, similar vulnerabilities may continue appearing unless companies simplify permission models and reduce unnecessary trust relationships.
✅ The confused deputy vulnerability class is a real and historically documented security concept first described by Norm Hardy in 1988. Modern cloud systems can still reproduce similar authorization failures.
✅ Azure Kubernetes Service and Google Cloud Config Connector were reported by security researcher Justin O’Leary as examples of potential confused deputy weaknesses involving identity and privilege escalation.
❌ There is currently no evidence that these flaws caused widespread real-world attacks against Microsoft Azure or Google Cloud customers. The primary concern is exposure risk and architectural weakness.
Final Thoughts: Cloud Trust Must Be Earned, Not Assumed
The discovery of confused deputy flaws in major cloud platforms serves as a reminder that security problems do not always come from outside attackers.
Sometimes the greatest risks emerge from systems designed to help.
Cloud providers, enterprises, and security researchers must work together to strengthen identity verification and reduce hidden trust paths.
The cloud revolution has created incredible possibilities, but every new layer of automation introduces new responsibilities.
In the modern cybersecurity era, trust cannot be inherited.
It must be continuously verified.
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References:
Reported By: www.darkreading.com
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