CVE-2018-16841

MEDIUMEPSS 91th pctl

6.5

CVSS v3

Description

Samba from version 4.3.0 and before versions 4.7.12, 4.8.7 and 4.9.3 are vulnerable to a denial of service. When configured to accept smart-card authentication, Samba's KDC will call talloc_free() twice on the same memory if the principal in a validly signed certificate does not match the principal in the AS-REQ. This is only possible after authentication with a trusted certificate. talloc is robust against further corruption from a double-free with talloc_free() and directly calls abort(), terminating the KDC process.

CWE-416Use After Free CWE-415

How to fix

Remediation Available

sambaDebian

Fixed in:2:4.9.2+dfsg-2CVE-2018-16841

sambaUbuntu

Fixed in:2:4.3.11+dfsg-0ubuntu0.14.04.19USN-3827-1

Fixed in:2:4.3.11+dfsg-0ubuntu0.16.04.18USN-3827-1

Fixed in:2:4.7.6+dfsg~ubuntu-0ubuntu2.5USN-3827-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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 VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

4.59%probability of exploitation in 30 days

91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

References

Patch1

samba.org

Third-Party Advisory7

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	96%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2021-34833	High	7.8	96%	-	-

Common questions

How do I fix CVE-2018-16841?

Published advisories record a fix for 2 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2018-16841 being actively exploited?

Not that we know of. CVE-2018-16841 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 4.6% is the estimated probability that it will be exploited in the next 30 days. That is higher than 91% of all scored CVEs.

How severe is CVE-2018-16841?

CVE-2018-16841 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2018-16841 affect?

Published advisories record a fix for samba (Debian), samba (Ubuntu). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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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.