CVE-2024-24685

Executive Summary

CVE-2024-24685 is a high-severity (CVSS 7.8) stack-based buffer overflow vulnerability in the readOFF functionality of libigl v2.5.0. The flaw resides in the parsing of comments within the vertex section of a specially crafted .off file. An attacker can exploit this by providing a malicious .off file, leading to stack-based buffer overflow, which may allow arbitrary code execution or denial of service. No public exploit code or patch is currently available, and the EPSS score is 0.0%, indicating low exploitation likelihood in the wild. The vulnerability is classified under MITRE Tactic T1203 (Exploitation for Client Execution) and CWE-121 (Stack-based Buffer Overflow).

CVSS Breakdown & Threat Level

• CVSS Score: 7.8 (High)
• Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
• Attack Vector: Local (requires user to open a malicious file)
• Attack Complexity: Low
• Privileges Required: None
• User Interaction: Required
• Scope: Unchanged
• Confidentiality Impact: High
• Integrity Impact: High
• Availability Impact: High

Threat Level: High. Although no active exploitation is reported, the vulnerability allows full system compromise if triggered.

Deep Dive & Mechanics

The vulnerability exists in the readOFF function of libigl v2.5.0, specifically during the parsing of comments within the vertex section of an .off file. The .off (Object File Format) is a simple text-based format for 3D geometry. The readOFF function reads vertex coordinates and may encounter comment lines (starting with #). Due to insufficient bounds checking, a long comment line can overflow a fixed-size stack buffer, corrupting adjacent memory.

Root Cause: The function uses a fixed-size buffer (e.g., char buffer[256]) to read comment lines without validating the length. An attacker can craft a .off file with a comment line exceeding the buffer size, causing a stack-based buffer overflow.

Attack Vector: The attacker must convince a user to open a malicious .off file using an application that relies on libigl (e.g., geometry processing tools). The overflow can overwrite the return address or other critical data, leading to arbitrary code execution.

Vulnerable vs. Patched Code

Vulnerable Code (libigl v2.5.0):

// Simplified vulnerable snippet
void readOFF(const std::string& filename) {
    FILE* fp = fopen(filename.c_str(), "r");
    char buffer[256];
    while (fgets(buffer, sizeof(buffer), fp)) {
        if (buffer[0] == '#') {
            // No length check - overflow possible
            char comment[256];
            sscanf(buffer, "# %s", comment); // stack buffer overflow
        }
    }
}

Patched Code (Hypothetical):

void readOFF(const std::string& filename) {
    FILE* fp = fopen(filename.c_str(), "r");
    char buffer[256];
    while (fgets(buffer, sizeof(buffer), fp)) {
        if (buffer[0] == '#') {
            // Use dynamic allocation or safe functions
            std::string comment(buffer);
            // Process comment safely
        }
    }
}

Note: No official patch is available. The fix should involve using safe string functions (e.g., std::string) or limiting input length.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• libigl v2.5.0 installed
• A vulnerable application using readOFF
• Ability to deliver a malicious .off file

Exploit Steps:

1. Craft a malicious .off file with an oversized comment line:

OFF
# 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