USN-6279-1

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Source
https://ubuntu.com/security/notices/USN-6279-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6279-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-6279-1
Related
Published
2023-08-09T06:08:18.156745Z
Modified
2025-07-16T04:44:11Z
Summary
openssh update
Details

It was discovered that OpenSSH has an observable discrepancy leading to an information leak in the algorithm negotiation. This update mitigates the issue by tweaking the client hostkey preference ordering algorithm to prefer the default ordering if the user has a key that matches the best-preference default algorithm.

References

Affected packages

Ubuntu:Pro:14.04:LTS / openssh

Package

Name
openssh
Purl
pkg:deb/ubuntu/openssh@1:6.6p1-2ubuntu2.13+esm2?arch=source&distro=trusty/esm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:6.6p1-2ubuntu2.13+esm2

Affected versions

1:6.*

1:6.2p2-6
1:6.2p2-6ubuntu1
1:6.4p1-1
1:6.4p1-2
1:6.5p1-1
1:6.5p1-2
1:6.5p1-3
1:6.5p1-4
1:6.5p1-6
1:6.6p1-1
1:6.6p1-2
1:6.6p1-2ubuntu1
1:6.6p1-2ubuntu2
1:6.6p1-2ubuntu2.2
1:6.6p1-2ubuntu2.3
1:6.6p1-2ubuntu2.4
1:6.6p1-2ubuntu2.6
1:6.6p1-2ubuntu2.7
1:6.6p1-2ubuntu2.8
1:6.6p1-2ubuntu2.10
1:6.6p1-2ubuntu2.11
1:6.6p1-2ubuntu2.12
1:6.6p1-2ubuntu2.13
1:6.6p1-2ubuntu2.13+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "openssh-client",
            "binary_version": "1:6.6p1-2ubuntu2.13+esm2"
        },
        {
            "binary_name": "openssh-client-dbgsym",
            "binary_version": "1:6.6p1-2ubuntu2.13+esm2"
        },
        {
            "binary_name": "openssh-client-udeb",
            "binary_version": "1:6.6p1-2ubuntu2.13+esm2"
        },
        {
            "binary_name": "openssh-client-udeb-dbgsym",
            "binary_version": "1:6.6p1-2ubuntu2.13+esm2"
        },
        {
            "binary_name": "openssh-server",
            "binary_version": "1:6.6p1-2ubuntu2.13+esm2"
        },
        {
            "binary_name": "openssh-server-dbgsym",
            "binary_version": "1:6.6p1-2ubuntu2.13+esm2"
        },
        {
            "binary_name": "openssh-server-udeb",
            "binary_version": "1:6.6p1-2ubuntu2.13+esm2"
        },
        {
            "binary_name": "openssh-server-udeb-dbgsym",
            "binary_version": "1:6.6p1-2ubuntu2.13+esm2"
        },
        {
            "binary_name": "openssh-sftp-server",
            "binary_version": "1:6.6p1-2ubuntu2.13+esm2"
        },
        {
            "binary_name": "openssh-sftp-server-dbgsym",
            "binary_version": "1:6.6p1-2ubuntu2.13+esm2"
        },
        {
            "binary_name": "ssh",
            "binary_version": "1:6.6p1-2ubuntu2.13+esm2"
        },
        {
            "binary_name": "ssh-askpass-gnome",
            "binary_version": "1:6.6p1-2ubuntu2.13+esm2"
        },
        {
            "binary_name": "ssh-askpass-gnome-dbgsym",
            "binary_version": "1:6.6p1-2ubuntu2.13+esm2"
        },
        {
            "binary_name": "ssh-krb5",
            "binary_version": "1:6.6p1-2ubuntu2.13+esm2"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Ubuntu:Pro:16.04:LTS / openssh

Package

Name
openssh
Purl
pkg:deb/ubuntu/openssh@1:7.2p2-4ubuntu2.10+esm4?arch=source&distro=esm-infra/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:7.2p2-4ubuntu2.10+esm4

Affected versions

1:6.*

1:6.9p1-2
1:6.9p1-3

1:7.*

1:7.1p1-1
1:7.1p1-3
1:7.1p1-4
1:7.1p1-6
1:7.1p2-1
1:7.1p2-2
1:7.2p1-1
1:7.2p2-1
1:7.2p2-2
1:7.2p2-3
1:7.2p2-4
1:7.2p2-4ubuntu1
1:7.2p2-4ubuntu2.1
1:7.2p2-4ubuntu2.2
1:7.2p2-4ubuntu2.4
1:7.2p2-4ubuntu2.5
1:7.2p2-4ubuntu2.6
1:7.2p2-4ubuntu2.7
1:7.2p2-4ubuntu2.8
1:7.2p2-4ubuntu2.10
1:7.2p2-4ubuntu2.10+esm1
1:7.2p2-4ubuntu2.10+esm2
1:7.2p2-4ubuntu2.10+esm3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "openssh-client",
            "binary_version": "1:7.2p2-4ubuntu2.10+esm4"
        },
        {
            "binary_name": "openssh-client-dbgsym",
            "binary_version": "1:7.2p2-4ubuntu2.10+esm4"
        },
        {
            "binary_name": "openssh-client-ssh1",
            "binary_version": "1:7.2p2-4ubuntu2.10+esm4"
        },
        {
            "binary_name": "openssh-client-ssh1-dbgsym",
            "binary_version": "1:7.2p2-4ubuntu2.10+esm4"
        },
        {
            "binary_name": "openssh-client-udeb",
            "binary_version": "1:7.2p2-4ubuntu2.10+esm4"
        },
        {
            "binary_name": "openssh-client-udeb-dbgsym",
            "binary_version": "1:7.2p2-4ubuntu2.10+esm4"
        },
        {
            "binary_name": "openssh-server",
            "binary_version": "1:7.2p2-4ubuntu2.10+esm4"
        },
        {
            "binary_name": "openssh-server-dbgsym",
            "binary_version": "1:7.2p2-4ubuntu2.10+esm4"
        },
        {
            "binary_name": "openssh-server-udeb",
            "binary_version": "1:7.2p2-4ubuntu2.10+esm4"
        },
        {
            "binary_name": "openssh-server-udeb-dbgsym",
            "binary_version": "1:7.2p2-4ubuntu2.10+esm4"
        },
        {
            "binary_name": "openssh-sftp-server",
            "binary_version": "1:7.2p2-4ubuntu2.10+esm4"
        },
        {
            "binary_name": "openssh-sftp-server-dbgsym",
            "binary_version": "1:7.2p2-4ubuntu2.10+esm4"
        },
        {
            "binary_name": "ssh",
            "binary_version": "1:7.2p2-4ubuntu2.10+esm4"
        },
        {
            "binary_name": "ssh-askpass-gnome",
            "binary_version": "1:7.2p2-4ubuntu2.10+esm4"
        },
        {
            "binary_name": "ssh-askpass-gnome-dbgsym",
            "binary_version": "1:7.2p2-4ubuntu2.10+esm4"
        },
        {
            "binary_name": "ssh-krb5",
            "binary_version": "1:7.2p2-4ubuntu2.10+esm4"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Ubuntu:Pro:18.04:LTS / openssh

Package

Name
openssh
Purl
pkg:deb/ubuntu/openssh@1:7.6p1-4ubuntu0.7+esm2?arch=source&distro=esm-infra/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:7.6p1-4ubuntu0.7+esm2

Affected versions

1:7.*

1:7.5p1-10
1:7.6p1-4
1:7.6p1-4ubuntu0.1
1:7.6p1-4ubuntu0.2
1:7.6p1-4ubuntu0.3
1:7.6p1-4ubuntu0.5
1:7.6p1-4ubuntu0.6
1:7.6p1-4ubuntu0.7
1:7.6p1-4ubuntu0.7+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "openssh-client",
            "binary_version": "1:7.6p1-4ubuntu0.7+esm2"
        },
        {
            "binary_name": "openssh-client-dbgsym",
            "binary_version": "1:7.6p1-4ubuntu0.7+esm2"
        },
        {
            "binary_name": "openssh-client-udeb",
            "binary_version": "1:7.6p1-4ubuntu0.7+esm2"
        },
        {
            "binary_name": "openssh-server",
            "binary_version": "1:7.6p1-4ubuntu0.7+esm2"
        },
        {
            "binary_name": "openssh-server-dbgsym",
            "binary_version": "1:7.6p1-4ubuntu0.7+esm2"
        },
        {
            "binary_name": "openssh-server-udeb",
            "binary_version": "1:7.6p1-4ubuntu0.7+esm2"
        },
        {
            "binary_name": "openssh-sftp-server",
            "binary_version": "1:7.6p1-4ubuntu0.7+esm2"
        },
        {
            "binary_name": "openssh-sftp-server-dbgsym",
            "binary_version": "1:7.6p1-4ubuntu0.7+esm2"
        },
        {
            "binary_name": "ssh",
            "binary_version": "1:7.6p1-4ubuntu0.7+esm2"
        },
        {
            "binary_name": "ssh-askpass-gnome",
            "binary_version": "1:7.6p1-4ubuntu0.7+esm2"
        },
        {
            "binary_name": "ssh-askpass-gnome-dbgsym",
            "binary_version": "1:7.6p1-4ubuntu0.7+esm2"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Ubuntu:20.04:LTS / openssh

Package

Name
openssh
Purl
pkg:deb/ubuntu/openssh@1:8.2p1-4ubuntu0.9?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:8.2p1-4ubuntu0.9

Affected versions

1:8.*

1:8.0p1-6build1
1:8.1p1-1
1:8.1p1-5
1:8.2p1-4
1:8.2p1-4ubuntu0.1
1:8.2p1-4ubuntu0.2
1:8.2p1-4ubuntu0.3
1:8.2p1-4ubuntu0.4
1:8.2p1-4ubuntu0.5
1:8.2p1-4ubuntu0.7
1:8.2p1-4ubuntu0.8

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "openssh-client",
            "binary_version": "1:8.2p1-4ubuntu0.9"
        },
        {
            "binary_name": "openssh-client-dbgsym",
            "binary_version": "1:8.2p1-4ubuntu0.9"
        },
        {
            "binary_name": "openssh-client-udeb",
            "binary_version": "1:8.2p1-4ubuntu0.9"
        },
        {
            "binary_name": "openssh-server",
            "binary_version": "1:8.2p1-4ubuntu0.9"
        },
        {
            "binary_name": "openssh-server-dbgsym",
            "binary_version": "1:8.2p1-4ubuntu0.9"
        },
        {
            "binary_name": "openssh-server-udeb",
            "binary_version": "1:8.2p1-4ubuntu0.9"
        },
        {
            "binary_name": "openssh-sftp-server",
            "binary_version": "1:8.2p1-4ubuntu0.9"
        },
        {
            "binary_name": "openssh-sftp-server-dbgsym",
            "binary_version": "1:8.2p1-4ubuntu0.9"
        },
        {
            "binary_name": "openssh-tests",
            "binary_version": "1:8.2p1-4ubuntu0.9"
        },
        {
            "binary_name": "openssh-tests-dbgsym",
            "binary_version": "1:8.2p1-4ubuntu0.9"
        },
        {
            "binary_name": "ssh",
            "binary_version": "1:8.2p1-4ubuntu0.9"
        },
        {
            "binary_name": "ssh-askpass-gnome",
            "binary_version": "1:8.2p1-4ubuntu0.9"
        },
        {
            "binary_name": "ssh-askpass-gnome-dbgsym",
            "binary_version": "1:8.2p1-4ubuntu0.9"
        }
    ],
    "availability": "No subscription required"
}