CVE-2026-47828 in bosh-cli
Summary
by MITRE • 07/09/2026
During bosh create-env and bosh delete-env, the CLI uploads compiled CPI packages and rendered job templates to the new VM's DAV blobstore over HTTPS without verifying the server certificate, even though a CA certificate for that endpoint is available in the installation manifest. A network attacker can terminate the TLS connection, harvest the Basic-auth credentials, and read the rendered-templates archive containing every bootstrap secret for the new BOSH Director, then replay the credentials against the real VM's agent for root code execution. Affected versions: bosh-cli versions prior to v7.10.4.
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Analysis
by VulDB Data Team • 07/09/2026
This vulnerability represents a critical security flaw in the BOSH deployment lifecycle that exploits improper TLS certificate validation during environment creation and deletion operations. The issue manifests when the BOSH CLI executes create-env and delete-env commands, where it uploads sensitive compiled CPI packages and rendered job templates to the target VM's DAV blobstore using HTTPS connections. Despite having access to the CA certificate for the target endpoint through the installation manifest, the CLI fails to perform proper server certificate verification during these operations. This cryptographic weakness creates an exploitable attack surface that directly violates established security protocols and best practices for secure communications.
The technical exploitation of this vulnerability follows a specific attack pattern that leverages man-in-the-middle capabilities within the network infrastructure. An attacker positioned between the BOSH CLI and the target VM can terminate the TLS connection, forcing the CLI to fall back to an insecure communication channel. This termination allows the attacker to harvest Basic-authentication credentials that are transmitted alongside the blobstore uploads. The rendered templates archive contains sensitive bootstrap secrets including administrative credentials, encryption keys, and other critical configuration data required for BOSH Director operation. The vulnerability stems from a fundamental failure in certificate validation logic where the system possesses the necessary CA certificate but chooses not to utilize it for verification purposes.
The operational impact of this vulnerability extends far beyond simple credential theft, as successful exploitation leads to complete system compromise and privilege escalation. Once an attacker obtains the harvested credentials, they can replay them against the actual VM's agent service to achieve root code execution privileges, effectively gaining full administrative control over the target BOSH environment. This attack vector directly maps to multiple tactics within the ATT&CK framework including credential access through legitimate credentials and privilege escalation through agent compromise. The vulnerability affects all BOSH CLI versions prior to v7.10.4, making it a widespread concern across numerous production environments that have not yet been patched.
The underlying cause of this issue can be categorized as a CWE-295 vulnerability related to improper certificate validation or missing certificate verification in secure communications. This weakness directly contradicts industry standards and security guidelines for implementing secure communication channels in cloud infrastructure management tools. Organizations utilizing BOSH for deployment automation face significant risk exposure when operating affected versions, as the vulnerability allows attackers to gain access to sensitive operational data and execute arbitrary code within their infrastructure. The remediation strategy requires immediate patching of the BOSH CLI to version 7.10.4 or later, which implements proper certificate validation mechanisms and ensures that available CA certificates are properly utilized during blobstore communications.
Security practitioners should implement additional monitoring controls to detect unauthorized certificate validation bypass attempts and credential harvesting activities within their network infrastructure. The vulnerability demonstrates the critical importance of maintaining proper cryptographic security practices even when secure communication channels are available, as the presence of security controls does not guarantee their effective utilization. Organizations must conduct comprehensive security assessments of their BOSH deployment configurations to ensure that all certificate validation mechanisms are properly enforced and that no bypass opportunities exist within their automation pipelines. This vulnerability serves as a stark reminder of how seemingly minor implementation oversights in cryptographic verification can lead to catastrophic security consequences across cloud infrastructure management systems.