CVE-2025-0332: Telerik UI WinForms Path Traversal Flaw

CVE-2025-0332 Overview

A critical path traversal vulnerability exists in Progress® Telerik® UI for WinForms that allows attackers to exploit improper limitation of a target path during archive extraction. This vulnerability enables the decompression of an archive's content into a restricted directory, potentially allowing unauthorized file writes to sensitive locations on the system.

Critical Impact

Attackers can exploit this path traversal flaw to write arbitrary files outside intended directories, potentially leading to remote code execution, system compromise, or data tampering.

Affected Products

• Progress Telerik UI for WinForms versions prior to 2025 Q1 (2025.1.211)

Discovery Timeline

• 2025-02-12 - CVE-2025-0332 published to NVD
• 2025-07-03 - Last updated in NVD database

Technical Details for CVE-2025-0332

Vulnerability Analysis

This vulnerability is classified as CWE-22 (Improper Limitation of a Pathname to a Restricted Directory), commonly known as a path traversal or directory traversal vulnerability. The flaw exists in how Telerik UI for WinForms handles archive extraction operations, specifically in the validation of file paths contained within archive files.

When an application using the vulnerable Telerik UI components processes a maliciously crafted archive (such as a ZIP file), the extraction routine fails to properly sanitize file path entries. An attacker can craft an archive containing files with directory traversal sequences (e.g., ../) in their path names. When extracted, these files can be written to locations outside the intended extraction directory.

The vulnerability is exploitable over a network without requiring authentication or user interaction, making it particularly dangerous in environments where Telerik-based applications process user-supplied or externally-sourced archive files.

Root Cause

The root cause is insufficient validation of file paths during archive decompression operations. The affected code does not properly validate or sanitize the destination path for each file entry within an archive before extraction. This allows relative path components like .. to escape the intended extraction directory and write files to arbitrary locations on the filesystem where the application has write permissions.

Attack Vector

The attack vector is network-based. An attacker can exploit this vulnerability by providing a specially crafted archive file to an application built with vulnerable versions of Telerik UI for WinForms. The attack requires no privileges and no user interaction beyond normal application usage. When the target application extracts the malicious archive, files are written to attacker-controlled locations outside the designated extraction directory.

The exploitation typically involves creating a ZIP or similar archive containing entries with path traversal sequences such as ../../malicious.dll or absolute paths. Upon extraction, these entries are written to sensitive system directories, potentially overwriting critical files or placing executable payloads in strategic locations.

Detection Methods for CVE-2025-0332

Indicators of Compromise

• Unexpected file creation or modification in directories outside of application-designated extraction paths
• Presence of files with suspicious names in system directories such as C:\Windows\System32 or application startup folders
• Archive processing operations that result in writes to parent directories or absolute paths
• Log entries indicating file operations with .. path components during archive extraction

Detection Strategies

• Monitor for file write operations that traverse outside designated application directories during archive processing
• Implement file integrity monitoring on critical system directories and application folders
• Audit application logs for archive extraction events that result in unexpected file paths
• Deploy endpoint detection rules to identify Zip Slip-style exploitation patterns

Monitoring Recommendations

• Configure SentinelOne endpoint protection to monitor for suspicious file write patterns associated with path traversal attacks
• Enable detailed logging for applications using Telerik UI for WinForms components
• Implement network monitoring to detect potentially malicious archive files being transmitted to vulnerable applications
• Set up alerts for file creation events in protected directories that correlate with archive extraction operations

How to Mitigate CVE-2025-0332

Immediate Actions Required

• Upgrade Progress Telerik UI for WinForms to version 2025 Q1 (2025.1.211) or later immediately
• Identify all applications in your environment that utilize Telerik UI for WinForms and prioritize patching
• Implement input validation on any user-supplied archive files as a defense-in-depth measure
• Review and restrict file system permissions for applications processing archive files

Patch Information

Progress has released Telerik UI for WinForms version 2025 Q1 (2025.1.211) which addresses this vulnerability. Organizations should upgrade to this version or later to remediate the path traversal flaw. Detailed patch information and upgrade instructions are available in the Telerik Security Advisory CVE-2025-0332.

Workarounds

• Implement application-level path validation to reject archive entries containing .. sequences or absolute paths before extraction
• Restrict archive processing to trusted sources only until patching can be completed
• Use application sandboxing or containerization to limit the impact of potential exploitation
• Disable archive extraction functionality in affected applications if not critical to business operations

# Example: Validate extracted paths before writing (pseudocode approach)
# Ensure all extracted file paths resolve within the intended target directory
# Reject any paths containing ".." or absolute path references
# Apply strict file permission controls on extraction directories