CVE-2025-57777: Ni Dasylab RCE Vulnerability

CVE-2025-57777 Overview

CVE-2025-57777 is an out-of-bounds write vulnerability affecting Digilent DASYLab, a data acquisition and control system software widely used in industrial and laboratory environments. The vulnerability exists in displ2.dll due to improper bounds checking when parsing DSB (DASYLab Session Block) files. When a user opens a specially crafted DSB file, the application fails to properly validate input boundaries, enabling attackers to write data beyond allocated memory buffers. This memory corruption can be leveraged to achieve arbitrary code execution on the target system.

Critical Impact

Successful exploitation allows attackers to execute arbitrary code with the privileges of the user running DASYLab, potentially leading to complete system compromise through malicious DSB file delivery.

Affected Products

• NI DASYLab (all versions)
• Digilent DASYLab installations utilizing displ2.dll
• Systems processing untrusted DSB files with DASYLab

Discovery Timeline

• 2025-09-02 - CVE-2025-57777 published to NVD
• 2025-10-09 - Last updated in NVD database

Technical Details for CVE-2025-57777

Vulnerability Analysis

This vulnerability is classified under CWE-787 (Out-of-Bounds Write) and CWE-1285 (Improper Validation of Specified Index, Position, or Offset in Input). The flaw resides in the displ2.dll component, which handles display-related functionality when processing DSB session files.

The out-of-bounds write occurs because the parsing logic in displ2.dll does not adequately verify that data offsets and sizes specified within the DSB file structure fall within the boundaries of allocated memory regions. When processing a maliciously crafted DSB file containing oversized or malformed data fields, the vulnerable code writes beyond the intended buffer boundaries.

This type of memory corruption vulnerability is particularly dangerous as it can overwrite critical data structures, function pointers, or return addresses, allowing an attacker to redirect program execution flow to attacker-controlled code. The local attack vector requires user interaction—specifically, convincing a victim to open a malicious DSB file—but this is a common and effective attack scenario in industrial environments where engineers frequently exchange configuration and session files.

Root Cause

The root cause is improper bounds checking within the DSB file parsing routines in displ2.dll. The library fails to validate that index values, offsets, and data lengths extracted from the DSB file format are within acceptable ranges before using them in memory operations. This allows crafted input to specify write operations outside the bounds of allocated buffers.

Attack Vector

The attack requires local access and user interaction. An attacker must craft a malicious DSB file and deliver it to the victim through social engineering methods such as:

• Email attachments disguised as legitimate DASYLab session files
• Compromised file shares or collaborative storage systems
• Malicious downloads from untrusted sources
• USB drives or other removable media

When the victim opens the crafted DSB file in DASYLab, the vulnerable displ2.dll parses the malicious content, triggering the out-of-bounds write condition. The attacker can carefully construct the DSB file to achieve precise memory corruption, ultimately gaining arbitrary code execution with the privileges of the user running DASYLab.

The vulnerability mechanism involves parsing DSB file structures where the application trusts user-supplied offset and size values without proper validation. When these values exceed expected boundaries, the subsequent write operations corrupt adjacent memory regions. For detailed technical information, refer to the NI Security Advisory.

Detection Methods for CVE-2025-57777

Indicators of Compromise

• Unexpected crashes or abnormal behavior when opening DSB files in DASYLab
• Process memory dumps indicating corruption in displ2.dll memory regions
• Unusual child processes spawned by DASYLab application
• Presence of suspicious or unexpected DSB files in project directories

Detection Strategies

• Implement file integrity monitoring for DSB files in shared directories to detect potential tampering
• Deploy endpoint detection and response (EDR) solutions to monitor DASYLab process behavior for anomalous memory access patterns
• Configure application whitelisting to restrict execution of unexpected code from DASYLab process context
• Enable crash dump analysis to identify exploitation attempts targeting memory corruption vulnerabilities

Monitoring Recommendations

• Monitor email gateways for DSB file attachments from external or unknown sources
• Implement network detection rules for unusual file transfers involving DSB extensions
• Enable detailed logging for DASYLab application crashes and exceptions
• Review process creation events for unexpected executables spawned by DASYLab processes

How to Mitigate CVE-2025-57777

Immediate Actions Required

• Avoid opening DSB files from untrusted or unknown sources until patches are applied
• Implement network segmentation to isolate systems running DASYLab from general user networks
• Configure email filtering to quarantine or block DSB file attachments pending review
• Educate users about the risks of opening unsolicited session files

Patch Information

NI has released a security advisory addressing memory corruption vulnerabilities in Digilent DASYLab. Organizations should review the NI Security Advisory for specific patch availability and update instructions. Given that all versions of DASYLab are affected, upgrading to the latest patched version when available is critical.

Workarounds

• Restrict DSB file handling to verified and trusted sources only
• Implement application sandboxing for DASYLab to limit the impact of potential exploitation
• Use file type filtering on email gateways and web proxies to block unexpected DSB file transfers
• Consider running DASYLab in a virtualized environment with limited network access and reduced privileges

# Example: Configure Windows Defender Application Guard or similar sandboxing
# to isolate DASYLab when processing untrusted files
# Consult your organization's security team for implementation guidance