Insufficient verification of data authenticity in AsyncSSH - CVE-2023-46445

Vulnerability identifier: #VU84954

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2023-46445

CWE-ID: CWE-345

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to missing verification of data authenticity. A remote attacker can control the extension info message (RFC 8308) via a man-in-the-middle attack.

AsyncSSH
Storage Ceph
Fedora
Ubuntu
python3-asyncssh (Ubuntu package)
python-asyncssh

Install updates from vendor's website.

AsyncSSH - update to 2.14.1
Storage Ceph - update to 7.0z2
python3-asyncssh (Ubuntu package) - addressed in versions Ubuntu Pro, 1.12.2-1ubuntu0.2, 2.5.0-1ubuntu0.1
python-asyncssh - addressed in versions 2.13.2-4.el9, 2.14.1-1.fc39

• https://github.com/ronf/asyncssh/security/advisories/GHSA-cfc2-wr2v-gxm5
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ME34ROZWMDK5KLMZKTSA422XVJZ7IMTE/

• Multiple vulnerabilities in AsyncSSH
• Fedora 39 update for python-asyncssh
• Fedora EPEL 9 update for python-asyncssh
• Ubuntu update for python-asyncssh
• Ubuntu update for python-asyncssh
• Multiple vulnerabilities in IBM Storage Ceph