CVE-2023-35950

Executive Summary

CVE-2023-35950 is a critical stack-based buffer overflow vulnerability in the readOFF.cpp component of libigl v2.4.0. The flaw resides in the header parsing logic of OFF file processing, allowing a specially crafted .off file to overflow a stack buffer. Successful exploitation can lead to arbitrary code execution in the context of the application using libigl. The vulnerability has a CVSS score of 7.8 (High) and currently has no known public exploit or patch. The EPSS score is 0.0%, indicating low exploitation activity in the wild, but the risk remains significant for systems processing untrusted OFF files.

Supply Chain & Package Security

libigl is a widely used C++ geometry processing library, often integrated into research, simulation, and CAD software. This vulnerability introduces a supply chain risk for any application that depends on libigl v2.4.0 and processes OFF files. Organizations should audit their dependency trees for this specific version and consider replacing or isolating the library until a patch is available.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Local (L) – Requires the victim to open a malicious file.
• Attack Complexity (AC): Low (L) – No special conditions beyond file opening.
• Privileges Required (PR): None (N) – No authentication needed.
• User Interaction (UI): Required (R) – Victim must open the file.
• Scope (S): Unchanged (U) – Exploit affects only the vulnerable component.
• Confidentiality (C): High (H) – Potential for arbitrary code execution.
• Integrity (I): High (H) – Code execution can modify data.
• Availability (A): High (H) – Buffer overflow can crash the application.

Threat Level: High. While user interaction is required, the impact of arbitrary code execution makes this a critical risk for environments where untrusted OFF files are processed.

Deep Dive & Mechanics

The vulnerability is located in the readOFF.cpp file of libigl v2.4.0, specifically in the function responsible for parsing the header of an OFF file. The OFF file format begins with a header line containing the keyword "OFF" followed by vertex, face, and edge counts. The parser reads these values into stack-allocated buffers without proper bounds checking.

When a malicious .off file provides an excessively long header line or malformed numeric values, the stack buffer overflows. This overwrites adjacent stack memory, including the return address and other critical data. The overflow is stack-based, meaning it directly corrupts the call stack, making it exploitable for arbitrary code execution.

The vulnerability is triggered during the parsing of the header, before any geometry data is processed. This makes it a pre-authentication, pre-processing flaw.

Vulnerable vs. Patched Code

Vulnerable Code (libigl v2.4.0): The vulnerable function in readOFF.cpp uses fixed-size stack buffers for reading header tokens. For example:

char header[256];
sscanf(line, "%s %d %d %d", header, &vertices, &faces, &edges);

If line contains more than 255 characters before a space, header overflows.

Patched Code (Hypothetical): A patch would replace stack buffers with dynamic allocation or use safe string functions with length limits:

std::string header;
std::istringstream iss(line);
iss >> header >> vertices >> faces >> edges;

Or use snprintf with explicit size limits.

Exploitation & Lab Setup

Red Team (Offensive)

1. Craft Malicious OFF File: Create an .off file with a header line exceeding 256 bytes, containing shellcode in the overflow region.
2. Deliver Payload: Use social engineering to convince a user to open the file in a vulnerable application (e.g., a research tool using libigl).
3. Trigger Overflow: The application parses the header, overwriting the return address with a pointer to the shellcode.
4. Execute Code: Gain arbitrary code execution in the context of the application.

Example Malicious OFF Header:

OFF 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