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CanonicalCVE-2018-6557

HistoryAug 21, 2018 - 4:29 p.m.

CVE-2018-6557

2018-08-2116:29:00

CWE-59

canonical

web.nvd.nist.gov

102

cve

2018

6557

motd

base-files package

ubuntu

denial of service

privilege escalation

kernel symlink restrictions

CVSS2

4.4

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:L/AC:M/Au:N/C:P/I:P/A:P

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

AI Score

Confidence

High

EPSS

Percentile

5.1%

JSON

The MOTD update script in the base-files package in Ubuntu 18.04 LTS before 10.1ubuntu2.2, and Ubuntu 18.10 before 10.1ubuntu6 incorrectly handled temporary files. A local attacker could use this issue to cause a denial of service, or possibly escalate privileges if kernel symlink restrictions were disabled.

Affected configurations

Nvd

Node

base-files_projectbase-filesMatch10.1ubuntu2.2

canonicalubuntu_linuxMatch18.04lts

canonicalubuntu_linuxMatch18.10

VendorProductVersionCPE
base-files_projectbase-files10.1ubuntu2.2cpe:2.3:a:base-files_project:base-files:10.1ubuntu2.2:*:*:*:*:*:*:*
canonicalubuntu_linux18.04cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
canonicalubuntu_linux18.10cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
base-files_project	base-files	10.1ubuntu2.2	cpe:2.3:a:base-files_project:base-files:10.1ubuntu2.2:::::::*
canonical	ubuntu_linux	18.04	cpe:2.3:o:canonical:ubuntu_linux:18.04::::lts:::
canonical	ubuntu_linux	18.10	cpe:2.3:o:canonical:ubuntu_linux:18.10:::::::*

CNA Affected

[
  {
    "product": "base-files",
    "vendor": "Ubuntu",
    "versions": [
      {
        "lessThan": "10.1ubuntu2.2",
        "status": "affected",
        "version": "unspecified",
        "versionType": "custom"
      }
    ]
  }
]