CVE-2021-33481 Explained : Impact and Mitigation

A stack-based buffer overflow vulnerability was discovered in gocr through version 0.53-20200802. This vulnerability lies in the try_to_divide_boxes() function in pgm2asc.c file, posing a potential security risk.

Understanding CVE-2021-33481

CVE-2021-33481 is a stack-based buffer overflow vulnerability identified in the gocr software up to version 0.53-20200802. The flaw exists in the try_to_divide_boxes() function within pgm2asc.c, allowing attackers to exploit the program.

What is CVE-2021-33481?

The CVE-2021-33481 vulnerability in gocr version 0.53-20200802 is categorized as a stack-based buffer overflow flaw. It was reported on May 20, 2021, and poses a risk due to improper bounds checking in the try_to_divide_boxes() function.

The Impact of CVE-2021-33481

Exploitation of this vulnerability could lead to a denial of service (DoS) condition, and potentially remote code execution on systems running the affected gocr software. Attackers could craft malicious input to trigger the buffer overflow, compromising system integrity.

Technical Details of CVE-2021-33481

The technical details of CVE-2021-33481 include:

Vulnerability Description

The vulnerability involves a stack-based buffer overflow in gocr through version 0.53-20200802 within the try_to_divide_boxes() function in pgm2asc.c. Attackers can exploit this flaw to execute arbitrary code or cause a DoS condition.

Affected Systems and Versions

The affected product is gocr, and the vulnerable version is gocr 0.53-20200802. Users with this version installed are at risk of exploitation and should take immediate action to mitigate the threat.

Exploitation Mechanism

By sending specially crafted input to the try_to_divide_boxes() function, threat actors can trigger the buffer overflow, potentially gaining unauthorized access or disrupting the normal operation of the gocr software.

Mitigation and Prevention

To address CVE-2021-33481, consider the following mitigation strategies:

Immediate Steps to Take

Disable the affected gocr software or restrict access to vulnerable systems.
Apply security patches or updates released by the vendor to fix the buffer overflow vulnerability.

Long-Term Security Practices

Regularly update software and systems to mitigate known vulnerabilities.
Implement network security measures to detect and prevent buffer overflow attacks.

Patching and Updates

Keep track of security advisories from gocr vendors and apply patches promptly to secure systems against potential threats.