CVE-2021-45930 : What You Need to Know

Qt SVG in Qt versions 5.0.0 through 5.15.2 and 6.0.0 through 6.2.1 is vulnerable to an out-of-bounds write, leading to potential security risks.

Understanding CVE-2021-45930

Qt SVG library versions 5.0.0 through 5.15.2 and 6.0.0 through 6.2.1 contain a specific vulnerability that could be exploited by attackers.

What is CVE-2021-45930?

CVE-2021-45930 is an out-of-bounds write vulnerability in the Qt SVG library versions 5.0.0 through 5.15.2 and 6.0.0 through 6.2.1. The issue arises from specific operations within the library that could result in unauthorized access to memory locations.

The Impact of CVE-2021-45930

The vulnerability in Qt SVG could potentially allow an attacker to execute arbitrary code or cause a denial of service by exploiting the out-of-bounds write issue. Successful exploitation of this vulnerability may lead to a compromise of the affected system's integrity and confidentiality.

Technical Details of CVE-2021-45930

Qt SVG vulnerability details and affected systems.

Vulnerability Description

The vulnerability involves an out-of-bounds write in QtPrivate::QCommonArrayOpsQPainterPath::Element::growAppend, triggered by QPainterPath::addPath and QPathClipper::intersect functions.

Affected Systems and Versions

Vendor: N/A
Product: N/A
Affected Versions: All versions of Qt between 5.0.0 to 5.15.2 and 6.0.0 to 6.2.1 are impacted.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting and executing specially designed inputs that leverage the vulnerable Qt SVG functions to gain unauthorized access to memory locations.

Mitigation and Prevention

Steps to mitigate the CVE-2021-45930 vulnerability.

Immediate Steps to Take

Update Qt to the latest patched version to eliminate the vulnerability.
Monitor vendor advisories and apply security patches promptly.
Employ appropriate security mechanisms to restrict unauthorized access to affected systems.

Long-Term Security Practices

Regularly update and patch software to mitigate potential vulnerabilities.
Conduct security audits and code reviews to identify and address security weaknesses.
Implement network segmentation and access controls to limit the impact of potential attacks.
Stay informed about latest security advisories and best practices.

Patching and Updates

Apply security updates and patches from Qt to address the CVE-2021-45930 vulnerability promptly.