CVE-2018-20538 : Security Advisory and Response
Learn about CVE-2018-20538, a denial of service vulnerability in Netwide Assembler (NASM) version 2.14rc16 due to a use-after-free flaw. Find out how to mitigate and prevent this issue.
A denial of service vulnerability in Netwide Assembler (NASM) version 2.14rc16 can lead to a use-after-free issue in certain finish tests.
Understanding CVE-2018-20538
This CVE involves a specific vulnerability in NASM version 2.14rc16 that can result in a denial of service due to a use-after-free flaw in the pp_getline function located in asm/preproc.c.
What is CVE-2018-20538?
The vulnerability in NASM version 2.14rc16 can be exploited to cause a denial of service during specific finish tests.
The Impact of CVE-2018-20538
The use-after-free vulnerability in NASM version 2.14rc16 can potentially disrupt the functionality of the affected system, leading to a denial of service.
Technical Details of CVE-2018-20538
This section provides more technical insights into the CVE.
Vulnerability Description
The vulnerability lies in the pp_getline function in asm/preproc.c of NASM version 2.14rc16, allowing for a use-after-free scenario.
Affected Systems and Versions
- Affected Version: NASM version 2.14rc16
- Affected Product: Netwide Assembler (NASM)
Exploitation Mechanism
The vulnerability can be exploited by triggering the use-after-free condition in the pp_getline function during certain finish tests.
Mitigation and Prevention
Protecting systems from CVE-2018-20538 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply vendor-supplied patches or updates promptly.
- Monitor vendor communications for security advisories.
- Consider implementing appropriate access controls to mitigate the risk.
Long-Term Security Practices
- Regularly update and patch software to address known vulnerabilities.
- Conduct security assessments and audits to identify and remediate weaknesses.
- Educate users on safe computing practices to prevent exploitation.
- Employ intrusion detection systems to monitor for unusual activity.
Patching and Updates
Ensure that NASM version 2.14rc16 is updated with the latest patches to mitigate the use-after-free vulnerability.