Description

Traffic interception vulnerability in BOSH Director vCenter CPI allows attackers positioned between BOSH Director and vCenter to impersonate vCenter REST API and capture administrator credentials via HTTP Basic auth, leading to complete virtualization infrastructure takeover. An attacker who can intercept traffic between the BOSH Director and vCenter can establish a malicious server impersonating the vCenter REST API. When the BOSH Director makes CPI calls to perform routine cloud infrastructure operations, the attacker captures the vCenter administrator username and password transmitted via HTTP Basic authentication. The vulnerability stems from insufficient authentication security in the communication protocol between BOSH Director and vCenter. While HTTPS may be used, the lack of proper certificate validation and pinning allows attackers to successfully impersonate vCenter endpoints. Because vCenter credentials typically grant full administrative control over the entire virtualization estate, successful credential capture yields complete takeover of every VM, datastore, and network the CPI manages. This exposure exists on every CPI call (including routine deployment operations, not just when tags are configured) and cannot be mitigated by supplying a CA certificate alone. The attack impacts all infrastructure managed by the compromised vCenter instance, potentially affecting hundreds or thousands of VMs across multiple deployments and environments.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.7",
  "pubDate": "2026-08-29T03:17:06.637Z",
  "pubdate": "2026-08-29T03:17:06.637Z",
  "executiveSummary": "This vulnerability involves a Man-in-the-Middle (MitM) flaw within the BOSH Director vCenter Cloud Provider Interface (CPI).\nThe issue stems from inadequate certificate validation protocols during communication between the BOSH Director and the vCenter REST API.\nAn attacker positioned on the network path between these entities can intercept and decrypt traffic to capture cleartext administrator credentials transmitted via HTTP Basic authentication.\nSuccessful exploitation results in full administrative control over the entire virtualization infrastructure managed by the affected vCenter instance, impacting all associated virtual machines, datastores, and network configurations.\nThe vulnerability is pervasive, affecting routine infrastructure operations regardless of specific tag configurations.\nRisk implications are critical, as the exposure of administrative credentials enables persistent unauthorized access and total environmental takeover.\nExploitation requires the attacker to possess the capability to perform traffic interception between the management components, typically achieved through ARP spoofing, DNS poisoning, or compromised network infrastructure.",
  "technicalDetails": "The core of this vulnerability lies in the improper implementation of TLS/SSL validation within the BOSH Director vCenter CPI. While the communication utilizes HTTPS, the client fails to enforce strict server certificate validation or certificate pinning against the vCenter endpoint.\nBecause the CPI does not verify the authenticity of the presented certificate against a trusted Certificate Authority (CA) or a pinned fingerprint, a malicious actor can present a self-signed or forged certificate to the BOSH Director during the TLS handshake.\nThe attack flow proceeds as follows: 1. The attacker positions themselves as a transparent proxy or performs a MitM attack between the BOSH Director and vCenter. 2. When the BOSH Director initiates a routine CPI call for infrastructure management, the attacker intercepts the connection request. 3. The attacker establishes an impersonation endpoint that presents a rogue certificate. 4. Due to the lack of validation, the BOSH Director accepts the connection. 5. The BOSH Director sends the vCenter administrator credentials via HTTP Basic authentication headers. 6. The attacker logs the plaintext credentials from the captured request headers.\nThe vulnerability exists within the network communication stack of the CPI component. It is triggered during any routine deployment operation, as these operations necessitate frequent API calls to manage virtual infrastructure. The lack of robust certificate verification means that supplying a CA certificate is insufficient to mitigate the risk if the underlying logic does not strictly mandate chain-of-trust verification.\nThe impact of credential exposure is absolute. vCenter administrative credentials grant full access to the vCenter Server Appliance (VCSA) API and the underlying ESXi hosts. An attacker with these credentials can perform unauthorized operations including, but not limited to: deploying malicious virtual machines, modifying virtual network topologies, exfiltrating data from virtual disks, and destroying existing infrastructure state. Since these credentials are used for high-privilege management, the scope of the compromise extends to every VM and resource pool managed by the specific vCenter instance, effectively bypassing infrastructure-level security controls enforced by BOSH."
}