CVE-2025-53542: Headlamp Kubernetes Web UI RCE Vulnerability

CVE-2025-53542 Overview

CVE-2025-53542 is a command injection vulnerability [CWE-78] in Headlamp, an extensible Kubernetes web user interface (UI) maintained under the kubernetes-sigs organization. The flaw resides in app/mac/scripts/codeSign.js, the macOS packaging workflow script responsible for signing the Headlamp application. The script invokes Node.js's execSync() with unsanitized values pulled from environment variables and application configuration. Attackers who can influence ${teamID}, ${entitlementsPath}, or ${config.app} can inject arbitrary shell commands during the build process. The issue is fixed in Headlamp 0.31.1.

Critical Impact

Successful exploitation enables arbitrary command execution in the context of the macOS build pipeline, exposing signing keys, source code, and downstream artifacts to compromise.

Affected Products

• Kubernetes Headlamp versions prior to 0.31.1
• macOS packaging workflow component (app/mac/scripts/codeSign.js)
• Build environments invoking Headlamp's electron-builder afterSign hook

Discovery Timeline

• 2025-07-10 - CVE-2025-53542 published to the National Vulnerability Database (NVD)
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-53542

Vulnerability Analysis

The vulnerability is a classic OS command injection [CWE-78] in a build-time signing script. Headlamp uses execSync() from Node.js's child_process module to assemble and execute the macOS codesign invocation. Because execSync() spawns a shell, any metacharacter contained in the interpolated variables (;, &&, backticks, $()) is parsed by /bin/sh rather than treated as literal argument data.

The three injection sinks (teamID, entitlementsPath, and config.app) are sourced from environment variables and the electron-builder configuration object. An attacker with the ability to influence the build environment, including a malicious dependency, compromised CI variable, or attacker-controlled fork running the workflow, can place shell metacharacters into any of these values to execute arbitrary commands under the build user's privileges.

Root Cause

The root cause is the combined use of shell interpolation and an unsafe API. execSync(command) passes the assembled string to a shell, so dynamic data is not separated from the command verb. The codeSign.js script trusted environment-supplied values as well-formed identifiers without validation or quoting.

Attack Vector

Exploitation requires local access to the build host and user interaction during the packaging step, consistent with the local attack vector. Realistic abuse paths include a malicious pull request that overrides environment variables in CI, a compromised developer workstation, or a tampered .env file consumed by dotenv at the top of the script. Successful injection runs commands with full access to signing material and source artifacts.

// Patch from kubernetes-sigs/headlamp commit 5bc0a9dd
 require('dotenv').config();
-const { execSync } = require('child_process');
+const { execFileSync } = require('child_process');
 const path = require('path');
 
 exports.default = async function codeSign(config) {

Source: GitHub Commit 5bc0a9d. The fix replaces execSync() with execFileSync(), which accepts the binary path and an array of arguments without invoking a shell, eliminating metacharacter interpretation.

Detection Methods for CVE-2025-53542

Indicators of Compromise

• Unexpected child processes spawned by node during electron-builder or npm run package execution on macOS build hosts.
• Outbound network connections originating from the build user during the signing phase.
• Modifications to .env files or CI environment configuration that introduce shell metacharacters into APPLE_TEAM_ID or related variables.
• Build logs showing codesign invocations with embedded ;, &&, |, or backtick characters.

Detection Strategies

• Audit Headlamp repositories and forks for any version of app/mac/scripts/codeSign.js still importing execSync from child_process.
• Apply software composition analysis to flag Headlamp releases prior to 0.31.1 in internal package mirrors.
• Inspect CI/CD pipeline definitions for unrestricted contributor write access to environment variables consumed by the signing workflow.

Monitoring Recommendations

• Enable process auditing on macOS build runners to record the full argv of every child of node during release builds.
• Forward CI runner telemetry to a central data lake and alert on anomalous shells, network egress, or filesystem reads of signing identities during packaging.
• Track integrity hashes of codeSign.js across branches and block merges that reintroduce shell-invoking APIs.

How to Mitigate CVE-2025-53542

Immediate Actions Required

• Upgrade Headlamp to version 0.31.1 or later across all build, packaging, and distribution environments.
• Rotate any Apple Developer signing identities, notarization credentials, and CI secrets that were exposed to vulnerable build runs.
• Restrict who can modify environment variables (APPLE_TEAM_ID, ENTITLEMENTS_PATH) and electron-builder configuration in protected branches.

Patch Information

The vulnerability is fixed in Headlamp 0.31.1 via pull request #3377. The fix replaces execSync() with execFileSync() in app/mac/scripts/codeSign.js, passing the codesign arguments as an array rather than a shell-interpolated string. See the GitHub Security Advisory GHSA-34rf-485x-g5h7 and the ZeroDaySec advisory for full disclosure details.

Workarounds

• If an immediate upgrade is not possible, vendor-patch codeSign.js locally to call execFileSync('/usr/bin/codesign', [...args]) and validate that teamID, entitlementsPath, and config.app match strict allow-list patterns.
• Run macOS packaging only on isolated, ephemeral runners with no persistent secrets and no inbound contributor influence over environment variables.
• Disable automatic builds on pull requests from untrusted forks until the patched version is deployed.

# Verify the installed Headlamp version on a build runner
npm ls @kinvolk/headlamp-plugin || npm view headlamp version

# Pin a safe version in package.json
npm install --save-dev electron-builder headlamp@^0.31.1