USN-3833-1

Jann Horn discovered that the Linux kernel mishandles mapping UID or GID ranges inside nested user namespaces in some situations. A local attacker could use this to bypass access controls on resources outside the namespace. (CVE-2018-18955)

Philipp Wendler discovered that the overlayfs implementation in the Linux kernel did not properly verify the directory contents permissions from within a unprivileged user namespace. A local attacker could use this to expose sensitive information (protected file names). (CVE-2018-6559)

References

Affected packages

Ubuntu:18.04:LTS / linux-aws

Package

Name: linux-aws
Purl: pkg:deb/ubuntu/linux-aws@4.15.0-1029.30?arch=source&distro=bionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

4.15.0-1029.30

Affected versions

4.*

4.15.0-1001.1

4.15.0-1003.3

4.15.0-1005.5

4.15.0-1006.6

4.15.0-1007.7

4.15.0-1009.9

4.15.0-1010.10

4.15.0-1011.11

4.15.0-1016.16

4.15.0-1017.17

4.15.0-1019.19

4.15.0-1020.20

4.15.0-1021.21

4.15.0-1023.23

4.15.0-1025.25

4.15.0-1027.27

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "linux-aws-cloud-tools-4.15.0-1029",
            "binary_version": "4.15.0-1029.30"
        },
        {
            "binary_name": "linux-aws-headers-4.15.0-1029",
            "binary_version": "4.15.0-1029.30"
        },
        {
            "binary_name": "linux-aws-tools-4.15.0-1029",
            "binary_version": "4.15.0-1029.30"
        },
        {
            "binary_name": "linux-cloud-tools-4.15.0-1029-aws",
            "binary_version": "4.15.0-1029.30"
        },
        {
            "binary_name": "linux-headers-4.15.0-1029-aws",
            "binary_version": "4.15.0-1029.30"
        },
        {
            "binary_name": "linux-image-4.15.0-1029-aws",
            "binary_version": "4.15.0-1029.30"
        },
        {
            "binary_name": "linux-modules-4.15.0-1029-aws",
            "binary_version": "4.15.0-1029.30"
        },
        {
            "binary_name": "linux-tools-4.15.0-1029-aws",
            "binary_version": "4.15.0-1029.30"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-3833-1.json"

cves_map

{
    "cves": [
        {
            "id": "CVE-2018-6559",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "low"
                }
            ]
        },
        {
            "id": "CVE-2018-18955",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:18.04:LTS"
}