CVE-2021-22890 : What You Need to Know
Learn about CVE-2021-22890, a vulnerability in curl versions 7.63.0 to 7.75.0 that allows a malicious HTTPS proxy to perform Man-in-the-Middle attacks by exploiting TLS 1.3 session tickets.
A detailed overview of CVE-2021-22890, including its impact, technical details, and mitigation strategies.
Understanding CVE-2021-22890
This section delves into the specifics of the CVE-2021-22890 vulnerability.
What is CVE-2021-22890?
curl versions 7.63.0 to 7.75.0 are susceptible to a security flaw that enables a malicious HTTPS proxy to conduct Man-in-the-Middle attacks. The vulnerability arises from incorrect handling of TLS 1.3 session tickets, allowing a rogue HTTPS proxy to intercept the connection.
The Impact of CVE-2021-22890
The vulnerability allows a malicious HTTPS proxy to intercept communication, potentially leading to unauthorized access or data tampering.
Technical Details of CVE-2021-22890
Explore the technical aspects of CVE-2021-22890 to grasp its implications fully.
Vulnerability Description
curl versions 7.63.0 to 7.75.0 improperly process session tickets, enabling a malicious HTTPS proxy to manipulate connections.
Affected Systems and Versions
curl versions 7.63.0 to 7.75.0 are affected by this vulnerability.
Exploitation Mechanism
A malicious HTTPS proxy can exploit the flaw by confusing libcurl with session tickets, bypassing TLS certificate checks.
Mitigation and Prevention
Discover the measures to mitigate the risks associated with CVE-2021-22890.
Immediate Steps to Take
Users should update curl to a patched version and avoid untrusted HTTPS proxies to prevent exploitation.
Long-Term Security Practices
Maintain a secure network environment and regularly update software to prevent similar vulnerabilities.
Patching and Updates
Refer to the provided vendor advisories for patching instructions and stay informed about security alerts and updates.