CVE-2018-6942 : Vulnerability Insights and Analysis
Learn about CVE-2018-6942, a vulnerability in FreeType 2 versions 2.9 and below that allows a malicious font file to trigger a NULL pointer dereference, leading to a denial-of-service attack. Find out how to mitigate and prevent this security issue.
FreeType 2 version 2.9 and below contain a vulnerability that allows a malicious font file to trigger a NULL pointer dereference in the Ins_GETVARIATION() function, leading to a denial-of-service attack.
Understanding CVE-2018-6942
This CVE entry identifies a vulnerability in FreeType 2 versions 2.9 and earlier that can be exploited by specially crafted font files.
What is CVE-2018-6942?
CVE-2018-6942 is a security flaw in FreeType 2 that can result in a NULL pointer dereference in the ttinterp.c file, specifically within the Ins_GETVARIATION() function. This vulnerability can be abused by an attacker through a malicious font file to cause a denial-of-service (DoS) attack.
The Impact of CVE-2018-6942
The exploitation of this vulnerability can lead to a denial-of-service attack, potentially disrupting the normal operation of systems utilizing the affected FreeType 2 versions.
Technical Details of CVE-2018-6942
FreeType 2 version 2.9 and below are susceptible to a specific vulnerability that allows for a NULL pointer dereference.
Vulnerability Description
The issue arises in the Ins_GETVARIATION() function within the ttinterp.c file, where a crafted font file can trigger a NULL pointer dereference, potentially leading to a denial-of-service attack.
Affected Systems and Versions
- Product: FreeType 2
- Vendor: N/A
- Versions affected: 2.9 and below
Exploitation Mechanism
The vulnerability can be exploited by a malicious font file that triggers the Ins_GETVARIATION() function, causing a NULL pointer dereference and enabling a denial-of-service attack.
Mitigation and Prevention
To address CVE-2018-6942, it is crucial to take immediate steps and implement long-term security practices.
Immediate Steps to Take
- Update FreeType 2 to a patched version that addresses the vulnerability.
- Avoid opening untrusted font files to mitigate the risk of exploitation.
Long-Term Security Practices
- Regularly update software and libraries to the latest secure versions.
- Conduct security assessments and audits to identify and remediate vulnerabilities proactively.
Patching and Updates
Ensure that FreeType 2 is regularly updated to the latest patched versions to prevent exploitation of known vulnerabilities.