Red Hat security advisory

Number: AV19-135
Date: 3 July 2019

On 3 July 2019, Red Hat released several fixes to address vulnerabilities in a library used in Red Hat Enterprise Linux 6. The updates correct several integer overflow weaknesses in the libssh2 packages that implement the SSH2 protocol. When exploiting the flaws, a remote actor that has compromised a SSH server could execute code on a client system.

CVEs:

  • CVE-2019-3855
  • CVE-2019-3856
  • CVE-2019-3857
  • CVE-2019-3863

The Cyber Centre encourages users and administrators to review the Red Hat Security webpage and apply the necessary updates:

https://access.redhat.com/errata/RHSA-2019:1652

Note to Readers

The Canadian Centre for Cyber Security (Cyber Centre) operates as part of the Communications Security Establishment. We are Canada’s national authority on cyber security and we lead the government’s response to cyber security events. As Canada's national computer security incident response team, the Cyber Centre works in close collaboration with government departments, critical infrastructure, Canadian businesses and international partners to prepare for, respond to, mitigate, and recover from cyber events. We do this by providing authoritative advice and support, and coordinating information sharing and incident response. The Cyber Centre is outward-facing, welcoming partnerships that help build a stronger, more resilient cyber space in Canada.

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