USN-5053-1

It was discovered that libssh incorrectly handled rekeying. A remote attacker could use this issue to cause libssh to crash, resulting in a denial of service, or possibly execute arbitrary code.

References

Affected packages

Ubuntu:20.04:LTS / libssh

Package

Name: libssh
Purl: pkg:deb/ubuntu/libssh@0.9.3-2ubuntu2.2?arch=source&distro=focal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

0.9.3-2ubuntu2.2

Affected versions

0.*

0.9.0-1ubuntu1

0.9.0-1ubuntu4

0.9.0-1ubuntu5

0.9.3-2ubuntu1

0.9.3-2ubuntu2

0.9.3-2ubuntu2.1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libssh-4",
            "binary_version": "0.9.3-2ubuntu2.2"
        },
        {
            "binary_name": "libssh-dev",
            "binary_version": "0.9.3-2ubuntu2.2"
        },
        {
            "binary_name": "libssh-gcrypt-4",
            "binary_version": "0.9.3-2ubuntu2.2"
        },
        {
            "binary_name": "libssh-gcrypt-dev",
            "binary_version": "0.9.3-2ubuntu2.2"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:20.04:LTS",
    "cves": [
        {
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ],
            "id": "CVE-2021-3634"
        }
    ]
}