Amazon Linux 2023 Security Advisory: ALAS2023-2025-865
Advisory Released Date: 2025-03-06
Advisory Updated Date: 2025-03-06
Severity:
Medium
Issue Overview:
A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. A machine-in-the-middle attack can be performed by a malicious machine impersonating a legit server. This issue occurs due to how OpenSSH mishandles error codes in specific conditions when verifying the host key. For an attack to be considered successful, the attacker needs to manage to exhaust the client's memory resource first, turning the attack complexity high. (CVE-2025-26465)
Affected Packages:
openssh
Issue Correction:
Run dnf update openssh --releasever 2023.6.20250303 to update your system.
New Packages:
aarch64:
openssh-clients-debuginfo-8.7p1-8.amzn2023.0.14.aarch64
pam_ssh_agent_auth-debuginfo-0.10.4-4.8.amzn2023.0.14.aarch64
openssh-debuginfo-8.7p1-8.amzn2023.0.14.aarch64
openssh-keycat-debuginfo-8.7p1-8.amzn2023.0.14.aarch64
openssh-server-8.7p1-8.amzn2023.0.14.aarch64
openssh-server-debuginfo-8.7p1-8.amzn2023.0.14.aarch64
openssh-debugsource-8.7p1-8.amzn2023.0.14.aarch64
openssh-8.7p1-8.amzn2023.0.14.aarch64
openssh-keycat-8.7p1-8.amzn2023.0.14.aarch64
pam_ssh_agent_auth-0.10.4-4.8.amzn2023.0.14.aarch64
openssh-clients-8.7p1-8.amzn2023.0.14.aarch64
src:
openssh-8.7p1-8.amzn2023.0.14.src
x86_64:
openssh-clients-debuginfo-8.7p1-8.amzn2023.0.14.x86_64
openssh-keycat-8.7p1-8.amzn2023.0.14.x86_64
pam_ssh_agent_auth-debuginfo-0.10.4-4.8.amzn2023.0.14.x86_64
openssh-server-debuginfo-8.7p1-8.amzn2023.0.14.x86_64
openssh-8.7p1-8.amzn2023.0.14.x86_64
pam_ssh_agent_auth-0.10.4-4.8.amzn2023.0.14.x86_64
openssh-keycat-debuginfo-8.7p1-8.amzn2023.0.14.x86_64
openssh-debuginfo-8.7p1-8.amzn2023.0.14.x86_64
openssh-server-8.7p1-8.amzn2023.0.14.x86_64
openssh-clients-8.7p1-8.amzn2023.0.14.x86_64
openssh-debugsource-8.7p1-8.amzn2023.0.14.x86_64