CVE-2021-29258 : Security Advisory and Response
Learn about CVE-2021-29258, a vulnerability in Envoy 1.14.0 allowing for a remotely exploitable crash due to an empty METADATA map triggering a Reachable Assertion. Find out the impact, technical details, and mitigation steps.
An issue was discovered in Envoy 1.14.0 where a remotely exploitable crash for HTTP2 Metadata occurs due to an empty METADATA map triggering a Reachable Assertion.
Understanding CVE-2021-29258
This CVE involves a vulnerability in Envoy 1.14.0 that allows for a remotely exploitable crash when dealing with HTTP2 Metadata.
What is CVE-2021-29258?
CVE-2021-29258 is a security flaw found in Envoy 1.14.0 that leads to a crash in HTTP2 Metadata handling, caused by an empty METADATA map.
The Impact of CVE-2021-29258
The impact of this CVE is the potential for a remote attacker to trigger a crash in the affected system by exploiting the HTTP2 Metadata vulnerability in Envoy 1.14.0.
Technical Details of CVE-2021-29258
This section covers the specifics of the vulnerability, affected systems, versions, and the exploitation mechanism.
Vulnerability Description
The vulnerability in Envoy 1.14.0 results in a crash due to an empty METADATA map triggering a Reachable Assertion, making it remotely exploitable for attackers.
Affected Systems and Versions
The affected system is Envoy version 1.14.0. Specifically, when dealing with HTTP2 Metadata, the vulnerability arises, opening a pathway for a crash to occur.
Exploitation Mechanism
By manipulating the handling of HTTP2 Metadata with an empty METADATA map, remote attackers can exploit this vulnerability to induce a crash in the system.
Mitigation and Prevention
To safeguard systems from CVE-2021-29258, immediate steps, long-term security practices, and the importance of patching and updates are crucial.
Immediate Steps to Take
It is recommended to apply the necessary patches and updates provided by Envoy to mitigate the risk of exploitation related to CVE-2021-29258.
Long-Term Security Practices
Implementing secure coding practices, regularly updating and monitoring systems, and conducting security audits can further enhance the resilience of the system against similar vulnerabilities.
Patching and Updates
Ensuring that Envoy 1.14.0 is updated with the latest patches and fixes is essential to address the vulnerability and prevent any potential exploitation.