CVE-2025-49848: PRJ File Parser Buffer Overflow Vulnerability

CVE-2025-49848 Overview

CVE-2025-49848 is an out-of-bounds write vulnerability [CWE-787] in the parsing logic for PRJ files. The flaw stems from insufficient validation of user-supplied data during file processing. An attacker who convinces a user to open a crafted PRJ file can trigger memory corruption, including reads and writes past allocated buffer boundaries. The vulnerability affects LS Electric products and was disclosed through CISA ICS Advisory ICSA-25-168-02. Exploitation requires local access and user interaction, but successful attacks can compromise confidentiality, integrity, and availability of the targeted application.

Critical Impact
A crafted PRJ file can corrupt memory in vulnerable LS Electric engineering software, enabling arbitrary code execution in the context of the user opening the file.

Affected Products

LS Electric engineering software that parses PRJ project files
Refer to CISA ICS Advisory ICSA-25-168-02 for the authoritative product and version list
Consult the LS Electric Support Page for vendor-supplied patches

Discovery Timeline

2025-06-17 - CVE-2025-49848 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-49848

Vulnerability Analysis

The vulnerability resides in the PRJ file parser. PRJ files store project configuration data consumed by engineering workstation software. The parser reads structured fields from the file without verifying that field sizes, offsets, or counts remain within allocated buffer bounds.

When the parser processes a malformed PRJ file, it writes data outside the intended memory region. This out-of-bounds write [CWE-787] corrupts adjacent heap or stack structures. Attackers who control the overwritten bytes can hijack control flow, overwrite function pointers, or manipulate object metadata to achieve code execution.

Exploitation requires the victim to open a malicious PRJ file. Once opened, the parser executes attacker-controlled data paths with the privileges of the running application. The CISA advisory categorizes this as an industrial control system risk because engineering workstations frequently interact with operational technology environments.

Root Cause

The parser lacks bounds checking on user-supplied length and offset fields embedded in PRJ files. The application trusts the file contents and uses size values directly in memory operations without sanitization or comparison against allocated buffer sizes.

Attack Vector

The attack vector is local with user interaction required. An attacker delivers a crafted PRJ file through email, removable media, shared network storage, or a compromised project repository. When an engineer opens the file in the vulnerable LS Electric application, the parser triggers the out-of-bounds write.

No verified public proof-of-concept exists at this time. Technical specifics on the exact field structure responsible for the overflow are not published. See the GitHub CSAF Document for the machine-readable advisory.

Detection Methods for CVE-2025-49848

Indicators of Compromise

PRJ files arriving from untrusted sources or with anomalous size, structure, or origin metadata
Unexpected crashes, exceptions, or memory access violations in LS Electric engineering software process logs
Child processes spawned by the engineering application immediately after opening a project file
Outbound network connections initiated by the engineering workstation following PRJ file access

Detection Strategies

Monitor process telemetry on engineering workstations for abnormal child processes launched by LS Electric software
Hash and inspect PRJ files transiting email gateways, file shares, and removable media for known malicious indicators
Enable application crash reporting and correlate crashes in PRJ parser modules with file-open events
Apply behavioral endpoint detection to flag memory corruption patterns such as ROP gadget execution or shellcode in user-mode processes

Monitoring Recommendations

Log file-open events for .prj extensions on engineering systems and forward to a centralized SIEM
Track integrity of engineering workstations using endpoint detection and response telemetry
Audit user accounts that handle PRJ files and restrict who can introduce project files from external sources
Review CISA ICS advisory updates regularly for new indicators tied to LS Electric products

How to Mitigate CVE-2025-49848

Immediate Actions Required

Identify all engineering workstations running LS Electric software that parses PRJ files
Restrict PRJ file ingestion to trusted, signed sources and block delivery through email or untrusted media
Apply vendor patches as soon as they are published by LS Electric
Isolate engineering workstations from general business networks using network segmentation

Patch Information

LS Electric publishes patches and updates through its support portal. Consult the LS Electric Support Page and CISA ICS Advisory ICSA-25-168-02 for available fixes, affected version ranges, and remediation guidance specific to your deployment.

Workarounds

Open PRJ files only from verified, internal project repositories under strict access control
Run the engineering application under a least-privilege user account to limit post-exploitation impact
Use application allowlisting to prevent unauthorized binaries from executing if the parser is compromised
Deploy host-based exploit mitigation controls such as Data Execution Prevention and Address Space Layout Randomization on engineering workstations

bash

# Example: restrict execution context for the engineering application on Windows
# Run the application as a standard user, not as Administrator
runas /trustlevel:0x20000 "C:\Program Files\LSElectric\EngineeringTool.exe"