7.0
HIGH
CVE-2018-6557
Ubuntu Base-Files MOTD Temporary File Handlers Denial of Service and Privilege Escalation
Description

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.

INFO

Published Date :

Aug. 21, 2018, 4:29 p.m.

Last Modified :

Jan. 18, 2023, 9:22 p.m.

Remotely Exploitable :

No

Impact Score :

5.9

Exploitability Score :

1.0
Affected Products

The following products are affected by CVE-2018-6557 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Canonical ubuntu_linux
1 Base-files_project base-files
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2018-6557.

URL Resource
http://www.securityfocus.com/bid/105148 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1041530 Broken Link Third Party Advisory VDB Entry
https://usn.ubuntu.com/3748-1/ Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2018-6557 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2018-6557 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Reanalysis by [email protected]

    Jan. 18, 2023

    Action Type Old Value New Value
    Removed CVSS V3 NIST AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
    Added CVSS V3.1 NIST AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type http://www.securitytracker.com/id/1041530 Third Party Advisory, VDB Entry http://www.securitytracker.com/id/1041530 Broken Link, Third Party Advisory, VDB Entry
    Changed CPE Configuration OR *cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:* OR *cpe:2.3:a:base-files_project:base-files:10.1ubuntu2.2:*:*:*:*:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*
  • Initial Analysis by [email protected]

    Nov. 21, 2018

    Action Type Old Value New Value
    Added CVSS V2 (AV:L/AC:M/Au:N/C:P/I:P/A:P)
    Added CVSS V3 AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://usn.ubuntu.com/3748-1/ No Types Assigned https://usn.ubuntu.com/3748-1/ Vendor Advisory
    Changed Reference Type http://www.securityfocus.com/bid/105148 No Types Assigned http://www.securityfocus.com/bid/105148 Third Party Advisory, VDB Entry
    Changed Reference Type http://www.securitytracker.com/id/1041530 No Types Assigned http://www.securitytracker.com/id/1041530 Third Party Advisory, VDB Entry
    Added CWE CWE-59
    Added CPE Configuration OR *cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Aug. 28, 2018

    Action Type Old Value New Value
    Added Reference http://www.securityfocus.com/bid/105148 [No Types Assigned]
  • CVE Modified by [email protected]

    Aug. 22, 2018

    Action Type Old Value New Value
    Added Reference http://www.securitytracker.com/id/1041530 [No Types Assigned]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2018-6557 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2018-6557 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.04 }} 0.00%

score

0.05635

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability