Dropbear SSH up to 2016 dbclient -m/-c access control

CVSS Meta Temp Score
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CTI Interest Score
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6.8$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Dropbear SSH up to 2016. The impacted element is an unknown function of the component dbclient. The manipulation of the argument -m/-c leads to access control. This vulnerability is documented as CVE-2016-7408. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Dropbear SSH up to 2016 (SSH Server Software) and classified as critical. This issue affects an unknown functionality of the component dbclient. The manipulation of the argument -m/-c with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

The dbclient in Dropbear SSH before 2016.74 allows remote attackers to execute arbitrary code via a crafted (1) -m or (2) -c argument.

The bug was discovered 09/15/2016. The weakness was released 03/03/2017 by Matt Johnston (oss-sec). It is possible to read the advisory at openwall.com. The identification of this vulnerability is CVE-2016-7408 since 09/09/2016. The attack may be initiated remotely. The successful exploitation needs a simple authentication. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 158 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 97266 (GLSA-201702-23 : Dropbear: Multiple vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Gentoo Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 38670 (Dropbear SSH Multiple Security Vulnerabilities).

Upgrading to version 2016.74 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 (97266) and SecurityFocus (BID 92970†). Entries connected to this vulnerability are available at VDB-97512, VDB-97509 and VDB-97510. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.1
VulDB Meta Temp Score: 7.1

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
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: Access control
CWE: CWE-284 / CWE-266
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: 97266
Nessus Name: GLSA-201702-23 : Dropbear: Multiple vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 803656
OpenVAS Name: Dropbear SSH Multiple Vulnerabilities
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Dropbear SSH 2016.74

Timelineinfo

09/09/2016 🔍
09/14/2016 +5 days 🔍
09/15/2016 +1 days 🔍
02/20/2017 +158 days 🔍
02/21/2017 +1 days 🔍
03/03/2017 +10 days 🔍
03/03/2017 +0 days 🔍
03/04/2017 +1 days 🔍
09/03/2020 +1279 days 🔍

Sourcesinfo

Advisory: openwall.com
Researcher: Matt Johnston
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-7408 (🔍)
GCVE (CVE): GCVE-0-2016-7408
GCVE (VulDB): GCVE-100-97511
SecurityFocus: 92970 - Dropbear SSH CVE-2016-7408 Remote Code Execution Vulnerability
OSVDB: - CVE-2016-7408 - Dropbear SSH - Code Execution Issue

See also: 🔍

Entryinfo

Created: 03/04/2017 13:53
Updated: 09/03/2020 18:38
Changes: 03/04/2017 13:53 (79), 09/03/2020 18:38 (3)
Complete: 🔍
Cache ID: 216::103

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

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