CVE-2026-82976
Exposure of Information Through Directory ListingA flaw was found in the image-customization-controller used in OpenShift's bare metal provisioning stack. The controller registers an HTTP file server on port 8084 with no authentication. The custom imageFileSystem implementation exposes a browsable HTML directory listing of all registered images at the root path. The only access control on per-host images is the random UUID filename; the directory listing discloses those UUIDs to any caller on the provisioning network. Each served image embeds an Ignition config containing the base64-encoded cluster pull secret, optional IRONIC_RAMDISK_SSH_KEY, proxy settings, and per-host NetworkManager keyfiles. An adjacent network attacker can enumerate all image UUIDs via directory listing, download any image, extract the embedded Ignition config, and recover the cluster pull secret and SSH key.
Evidence
pkg/imagehandler/imagefilesystem.go — root directory is browsable and enumerates all UUID image names
func (f *imageFileSystem) Readdir(n int) ([]fs.FileInfo, error) {
f.mu.Lock()
defer f.mu.Unlock()
result := []fs.FileInfo{}
for _, im := range f.images {
result = append(result, im)
}
return result, nil
}
func (f *imageFileSystem) Open(name string) (http.File, error) {
f.log.Info("Open", "path", name)
if name == "/" {
return f, nil
}
...
cmd/controller/main.go — file server bound on all interfaces without auth or TLS
http.Handle("/", http.FileServer(imageServer.FileSystem()))
go func() {
server := &http.Server{
Addr: imagesBindAddr, // default ":8084"
ReadHeaderTimeout: 5 * time.Second,
}
err := server.ListenAndServe()
pkg/ignition/service_config.go:94-100 — pull secret is embedded in every served image
func (b *ignitionBuilder) authFile() ignition_config_types_32.File {
source := "data:;base64," + strings.TrimSpace(b.ironicAgentPullSecret)
return ignition_config_types_32.File{
Node: ignition_config_types_32.Node{Path: "/etc/authfile.json"},
...
Attack Pattern
Adjacent provisioning-network client → GET / lists UUID image names → download ISO/initramfs → extract embedded Ignition → recover cluster pull secret and SSH key.
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Frequently Asked Questions
A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.
CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.
A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.
Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.
Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.
SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.