Samba 4.7.0 Kerberos resource consumption

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in Samba 4.7.0. This vulnerability affects unknown code of the component Kerberos Handler. This manipulation causes resource consumption. This vulnerability appears as CVE-2018-16853. The attack may be initiated remotely. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Samba 4.7.0 (File Transfer Software) and classified as problematic. Affected by this vulnerability is some unknown processing of the component Kerberos Handler. The manipulation with an unknown input leads to a resource consumption vulnerability. The CWE definition for the vulnerability is CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. As an impact it is known to affect availability. The summary by CVE is:

Samba from version 4.7.0 has a vulnerability that allows a user in a Samba AD domain to crash the KDC when Samba is built in the non-default MIT Kerberos configuration. With this advisory the Samba Team clarify that the MIT Kerberos build of the Samba AD DC is considered experimental. Therefore the Samba Team will not issue security patches for this configuration. Additionally, Samba 4.7.12, 4.8.7 and 4.9.3 have been issued as security releases to prevent building of the AD DC with MIT Kerberos unless --with-experimental-mit-ad-dc is specified to the configure command.

The bug was discovered 11/28/2018. The weakness was presented 11/28/2018 as confirmed bug report (Bugzilla). The advisory is shared at bugzilla.redhat.com. This vulnerability is known as CVE-2018-16853 since 09/11/2018. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 119246 (FreeBSD : samba -- multiple vulnerabilities (54976998-f248-11e8-81e2-005056a311d1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 277591 (Fedora Security Update for samba (FEDORA-2018-c2a93f8e1b)).

Upgrading eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (119246) and SecurityFocus (BID 106026†). See VDB-127263, VDB-127270, VDB-127271 and VDB-127272 for similar entries. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.2

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
NVD Vector: 🔍

CNA Base Score: 7.5
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 119246
Nessus Name: FreeBSD : samba -- multiple vulnerabilities (54976998-f248-11e8-81e2-005056a311d1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

08/14/2018 🔍
09/11/2018 +28 days 🔍
11/27/2018 +77 days 🔍
11/28/2018 +1 days 🔍
11/28/2018 +0 days 🔍
11/28/2018 +0 days 🔍
11/28/2018 +0 days 🔍
11/29/2018 +1 days 🔍
06/12/2023 +1656 days 🔍

Sourcesinfo

Product: samba.org

Advisory: bugzilla.redhat.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-16853 (🔍)
GCVE (CVE): GCVE-0-2018-16853
GCVE (VulDB): GCVE-100-127273
SecurityFocus: 106026 - Samba CVE-2018-16853 Remote Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 11/29/2018 07:52
Updated: 06/12/2023 08:12
Changes: 11/29/2018 07:52 (57), 04/15/2020 21:08 (6), 06/12/2023 08:12 (29)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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