CVE-2019-3855 : What You Need to Know
Learn about CVE-2019-3855, a high-impact vulnerability in libssh2 versions prior to 1.8.1 allowing remote code execution. Find mitigation steps and preventive measures here.
A vulnerability in libssh2 versions prior to 1.8.1 could allow a remote attacker to execute code on the client system. The impact is rated as HIGH with a CVSS base score of 7.5.
Understanding CVE-2019-3855
A vulnerability in libssh2 versions prior to 1.8.1 could allow a remote attacker to execute code on the client system.
What is CVE-2019-3855?
An out-of-bounds write vulnerability in libssh2 could be exploited by a remote attacker compromising an SSH server to execute code on the client system.
The Impact of CVE-2019-3855
The vulnerability has a HIGH impact, with a CVSS base score of 7.5, affecting confidentiality, integrity, and availability of systems.
Technical Details of CVE-2019-3855
The technical details of the CVE-2019-3855 vulnerability in libssh2.
Vulnerability Description
An out-of-bounds write vulnerability in libssh2 versions prior to 1.8.1 allows remote code execution on the client system.
Affected Systems and Versions
- Product: libssh2
- Vendor: The libssh2 Project
- Affected Version: 1.8.1 and earlier
Exploitation Mechanism
- Attack Complexity: HIGH
- Attack Vector: NETWORK
- Privileges Required: NONE
- User Interaction: REQUIRED
- Scope: UNCHANGED
- Confidentiality, Integrity, and Availability Impact: HIGH
Mitigation and Prevention
Steps to mitigate and prevent exploitation of CVE-2019-3855.
Immediate Steps to Take
- Update libssh2 to version 1.8.1 or later.
- Monitor for any unauthorized access or unusual activities on SSH servers.
Long-Term Security Practices
- Regularly update software and apply security patches.
- Implement network segmentation and access controls to limit exposure.
- Educate users on safe SSH practices and security awareness.
Patching and Updates
Ensure timely application of security patches and updates to all affected systems.