Learn about CVE-2018-16843, a vulnerability in nginx versions 1.15.6 and 1.14.1 related to excessive memory usage due to the HTTP/2 implementation. Find mitigation steps and preventive measures here.
CVE-2018-16843, published on November 7, 2018, addresses a vulnerability in nginx versions 1.15.6 and 1.14.1 related to the implementation of HTTP/2, potentially leading to excessive memory usage.
Understanding CVE-2018-16843
This CVE entry details a specific vulnerability in nginx versions 1.15.6 and 1.14.1 that can impact systems with the ngx_http_v2_module enabled.
What is CVE-2018-16843?
The vulnerability in nginx versions 1.15.6 and 1.14.1 is associated with the HTTP/2 implementation, which may cause increased memory consumption. It affects installations with the ngx_http_v2_module enabled, triggered by using the 'http2' option in the 'listen' directive.
The Impact of CVE-2018-16843
The vulnerability has a CVSS v3.0 base score of 5.3, indicating a medium severity issue with low attack complexity and network accessibility. While it poses a low availability impact, it does not affect confidentiality or integrity.
Technical Details of CVE-2018-16843
This section delves into the technical aspects of the CVE.
Vulnerability Description
The vulnerability in nginx versions 1.15.6 and 1.14.1 stems from the HTTP/2 implementation, leading to potential memory overconsumption.
Affected Systems and Versions
Exploitation Mechanism
The vulnerability can be exploited when the 'http2' option of the 'listen' directive is utilized in the nginx configuration file.
Mitigation and Prevention
Protecting systems from CVE-2018-16843 involves immediate actions and long-term security practices.
Immediate Steps to Take
Long-Term Security Practices
Patching and Updates