Is CVE-2018-6557 in the CISA KEV catalog?

No. CVE-2018-6557 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-6557?

CVE-2018-6557 has a CVSS v3 base score of 7.0 (HIGH).

What is the EPSS score for CVE-2018-6557?

CVE-2018-6557 has an EPSS score of 0.36% (29th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-6557?

Upgrade base-files on ubuntu 18.04 to 10.1ubuntu2.2 or later.

CVE & CISA-KEV Catalog

CVE-2018-6557

HIGH

7.0

CVSS v3

NVD

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.

CWE-59Link Following

How to fix

Remediation Available

base-filesUbuntu

Fixed in:10.1ubuntu2.2USN-3748-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.36%probability of exploitation in 30 days

29thpercentile

Low risk: more likely to be exploited than 29% of all known CVEs.

References

Vendor Advisory1

usn.ubuntu.com

Third-Party Advisory2

Related Vulnerabilities

Other CWE-59 (Link Following) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-30333	High	7.5	99%	KEV + Ransom	Fix
CVE-2021-21300	High	8.0	89%	-	Fix
CVE-2021-32610	High	7.1	73%	-	Fix
CVE-2020-36193	High	7.5	71%	KEV	Fix
CVE-2023-40028	Medium	4.9	58%	-	Fix
CVE-2020-0787	High	7.8	43%	KEV + Ransom	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.