CVE-2023-35952

Executive Summary

CVE-2023-35952 is a critical stack-based buffer overflow vulnerability in the readOFF.cpp component of libigl v2.4.0. The flaw resides in the code responsible for parsing comments within the geometric faces section of an OFF file. A specially crafted .off file can trigger a buffer overflow, potentially allowing an attacker to achieve arbitrary code execution. The vulnerability has a CVSS score of 7.8 (High) and currently has no known patch or public exploit. The EPSS score is 0.0%, indicating low exploitation activity in the wild, but the risk remains significant for systems that process untrusted OFF files.

Supply Chain & Package Security

libigl is a C++ geometry processing library widely used in academic and research contexts. It is distributed via GitHub and can be integrated into larger projects. The vulnerability affects the library's core file parsing functionality, making any application that uses libigl to load OFF files potentially vulnerable. There is no known package manager (NPM, PyPI, Go, Ruby) distribution for libigl, but it is commonly included as a Git submodule or direct dependency.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Local (L) – The attacker must provide a malicious file to the victim.
• Attack Complexity (AC): Low (L) – No special conditions are required.
• Privileges Required (PR): None (N) – No authentication needed.
• User Interaction (UI): Required (R) – The victim must open the malicious file.
• Scope (S): Unchanged (U) – The vulnerability does not affect other components.
• Confidentiality (C): High (H) – Potential for full data disclosure.
• Integrity (I): High (H) – Potential for full data modification.
• Availability (A): High (H) – Potential for denial of service or code execution.

Threat Level: High. While exploitation requires user interaction, the impact of successful exploitation is severe, allowing arbitrary code execution in the context of the user running the application.

Deep Dive & Mechanics

The vulnerability is a classic stack-based buffer overflow in the readOFF.cpp file of libigl v2.4.0. The readOFF function parses OFF (Object File Format) files, which are used to store 3D geometry data. The specific flaw is in the code that handles comments within the geometric faces section. Comments in OFF files are typically denoted by a # character. The parser fails to properly validate the length of the comment string before copying it into a fixed-size stack buffer. By providing an overly long comment line, an attacker can overflow the buffer, overwriting adjacent stack memory including the return address.

The vulnerable code path is triggered when the parser encounters a # character and reads the rest of the line into a buffer without bounds checking. This allows an attacker to control the execution flow by overwriting the saved return address on the stack.

Vulnerable vs. Patched Code

Vulnerable Code (libigl v2.4.0 - readOFF.cpp):

// Vulnerable snippet (conceptual)
char comment[256];
// ...
if (line[0] == '#') {
    sscanf(line, "# %s", comment); // No bounds checking
}

Patched Code (Hypothetical fix):

// Patched snippet (conceptual)
std::string comment;
// ...
if (line[0] == '#') {
    comment = line.substr(2); // Use safe string operations
}

The vulnerable code uses sscanf with %s which does not limit the number of characters read, leading to a buffer overflow. The patched code uses C++ std::string which dynamically allocates memory and prevents overflow.

Exploitation & Lab Setup

Red Team (Exploitation)

Lab Setup:

1. Install libigl v2.4.0 on a test system (e.g., Ubuntu 22.04).
2. Compile a simple program that uses igl::readOFF to load an OFF file.
3. Create a malicious OFF file with an overly long comment line in the faces section.

Malicious OFF File Example:

OFF
# 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