smb4k up to 2.0.0 DBUS Service input validation

CVSS Meta Temp Score
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CTI Interest Score
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7.4$0-$5k0.00

Summaryinfo

A vulnerability has been found in smb4k up to 2.0.0 and classified as critical. Impacted is an unknown function of the component DBUS Service. The manipulation leads to input validation. This vulnerability is uniquely identified as CVE-2017-8849. Local access is required to approach this attack. Moreover, an exploit is present. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in smb4k up to 2.0.0. It has been rated as critical. This issue affects an unknown part of the component DBUS Service. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

smb4k before 2.0.1 allows local users to gain root privileges by leveraging failure to verify arguments to the mount helper DBUS service.

The bug was discovered 05/10/2017. The weakness was disclosed 05/17/2017 by ryan (oss-sec). It is possible to read the advisory at openwall.com. The identification of this vulnerability is CVE-2017-8849 since 05/08/2017. Attacking locally is a requirement. A simple authentication is necessary for exploitation. Technical details are unknown but a public exploit is available.

The exploit is available at exploit-db.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 7 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 100308 (Fedora 25 : smb4k (2017-2cc18e2b3b)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176130 (Debian Security Update for smb4k (DSA 3951-1)).

Upgrading to version 2.0.1 eliminates this vulnerability. A possible mitigation has been published 3 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (42053), Tenable (100308) and SecurityFocus (BID 98737†). The entries VDB-101396 and VDB-101826 are pretty similar. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.4

VulDB Base Score: 7.8
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 100308
Nessus Name: Fedora 25 : smb4k (2017-2cc18e2b3b)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 867773
OpenVAS Name: Fedora Update for smb4k FEDORA-2017-aceb424894
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: smb4k 2.0.1
Patch: cgit.kde.org

Timelineinfo

05/08/2017 🔍
05/10/2017 +2 days 🔍
05/17/2017 +7 days 🔍
05/17/2017 +0 days 🔍
05/18/2017 +1 days 🔍
05/20/2017 +2 days 🔍
05/22/2017 +2 days 🔍
05/27/2017 +5 days 🔍
12/26/2024 +2770 days 🔍

Sourcesinfo

Advisory: FEDORA-2017-2cc18e2b3b
Researcher: Ryan Beisner (ryan)
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-8849 (🔍)
GCVE (CVE): GCVE-0-2017-8849
GCVE (VulDB): GCVE-100-101447

OVAL: 🔍

SecurityFocus: 98737 - Juju CVE-2017-8849 Local Privilege Escalation Vulnerability
OSVDB: - CVE-2017-8849 - smb4k - Privilege Escalation Issue

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 05/18/2017 16:14
Updated: 12/26/2024 03:51
Changes: 05/18/2017 16:14 (79), 09/30/2020 08:45 (9), 12/24/2020 16:01 (2), 12/06/2022 14:38 (3), 12/06/2022 14:42 (1), 12/26/2024 03:51 (16)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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