CVE-2025-30441: Apple Xcode Path Traversal Vulnerability

CVE-2025-30441 Overview

CVE-2025-30441 is a state management flaw in Apple Xcode that allows a local application to overwrite arbitrary files on the host system. Apple addressed the issue in Xcode 16.3 through improved state management. The vulnerability is categorized under [CWE-787] (Out-of-bounds Write) and requires user interaction to exploit. Successful exploitation compromises file integrity without directly leaking data or crashing the system.

Critical Impact
A malicious application running locally can overwrite arbitrary files, enabling tampering with developer artifacts, configuration files, or system components accessible to the current user.

Affected Products

Apple Xcode versions prior to 16.3
macOS developer environments running vulnerable Xcode builds
Continuous integration systems relying on affected Xcode toolchains

Discovery Timeline

2025-03-31 - CVE-2025-30441 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-30441

Vulnerability Analysis

The flaw resides in how Xcode manages internal state when writing files during build, indexing, or project operations. An application with local access can manipulate this state to redirect write operations to file paths of the attacker's choosing. The result is arbitrary file overwrite under the privileges of the Xcode user process. Because the CWE mapping is [CWE-787], the underlying primitive involves writing data outside the intended destination boundary. The vulnerability does not expose confidential data directly, but it undermines integrity guarantees that downstream security controls depend on.

Root Cause

Apple's advisory attributes the issue to improper state management within Xcode file-handling routines. When state transitions occur between validation and file write operations, the application fails to enforce that the resolved output path remains within the intended sandbox. This class of defect frequently overlaps with time-of-check to time-of-use (TOCTOU) patterns and symlink handling weaknesses on macOS.

Attack Vector

Exploitation requires local access and user interaction, typically launching or interacting with a crafted application or project. An attacker delivers a malicious Xcode project, plugin, or helper application to a developer. When the target opens the project or triggers a build, Xcode processes attacker-controlled inputs that steer file writes to sensitive locations. The attacker can then overwrite scripts, configuration files, or binaries the current user can modify, enabling persistence or supply-chain tampering in developer workflows.

See the Apple Support Article for Xcode 16.3 and the Full Disclosure mailing list post for additional context.

Detection Methods for CVE-2025-30441

Indicators of Compromise

Unexpected modifications to files outside a project's working directory following Xcode operations
New or modified LaunchAgents, LaunchDaemons, or shell profile files created by the Xcode process
Xcode child processes writing to /usr/local/, ~/Library/, or other paths unrelated to the active project

Detection Strategies

Monitor file system telemetry for write operations performed by Xcode, xcodebuild, and related helpers to paths outside expected project directories
Correlate the opening of untrusted .xcodeproj or .xcworkspace bundles with subsequent writes to user or system configuration files
Alert on symlink creation inside project directories immediately before Xcode file write events

Monitoring Recommendations

Enable macOS Endpoint Security event auditing for ES_EVENT_TYPE_NOTIFY_WRITE and ES_EVENT_TYPE_NOTIFY_RENAME originating from Xcode processes
Track Xcode version deployment across developer endpoints to identify hosts still running builds earlier than 16.3
Baseline typical Xcode write locations per developer and flag deviations for review

How to Mitigate CVE-2025-30441

Immediate Actions Required

Upgrade all installations of Xcode to version 16.3 or later on developer workstations and build servers
Restrict opening of Xcode projects sourced from untrusted repositories, email attachments, or shared drives
Audit developer endpoints for unauthorized file modifications correlated with recent Xcode activity

Patch Information

Apple addressed CVE-2025-30441 in Xcode 16.3 through improved state management. Details are documented in the Apple Support advisory. Organizations should distribute the update through managed software deployment or the Mac App Store and verify installation across all developer systems.

Workarounds

Only open Xcode projects from trusted sources until the update is applied
Run Xcode under least-privilege developer accounts to limit the reach of arbitrary writes
Enforce code signing and integrity checks on build outputs to detect tampered artifacts

bash

# Verify installed Xcode version meets the patched release
xcodebuild -version

# Confirm the active Xcode path
xcode-select -p