CVE-2021-3630 : What You Need to Know

An out-of-bounds write vulnerability was found in DjVuLibre in DJVU::DjVuTXT::decode() in DjVuText.cpp via a crafted djvu file which may lead to crash and segmentation fault. This flaw affects DjVuLibre versions prior to 3.5.28.

Understanding CVE-2021-3630

This CVE refers to an out-of-bounds write vulnerability in DjVuLibre, impacting versions before 3.5.28.

What is CVE-2021-3630?

The vulnerability in DjVuLibre's DjVuTXT::decode() function allows attackers to cause a crash or segmentation fault using a specially crafted djvu file.

The Impact of CVE-2021-3630

Exploitation of this vulnerability can lead to a denial of service by crashing the application or causing a segmentation fault.

Technical Details of CVE-2021-3630

This section provides more in-depth technical information about the CVE.

Vulnerability Description

The vulnerability is due to an out-of-bounds write issue in DjVuLibre, making it susceptible to crashes and segmentation faults.

Affected Systems and Versions

DjVuLibre versions prior to 3.5.28 are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by supplying a specially crafted djvu file to trigger the out-of-bounds write and cause the application to crash.

Mitigation and Prevention

To protect systems from CVE-2021-3630, immediate steps should be taken, along with implementing long-term security practices and applying necessary patches and updates.

Immediate Steps to Take

Update DjVuLibre to version 3.5.28 or later to mitigate the vulnerability.

Long-Term Security Practices

Regularly update software and libraries to prevent vulnerabilities.
Implement robust input validation to block malicious inputs.

Patching and Updates

Stay informed about security advisories and apply patches promptly to keep systems secure.