Dropbear SSH up to 2016 username/host input validation

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in Dropbear SSH up to 2016. Impacted is an unknown function. Performing a manipulation of the argument username/host results in input validation. This vulnerability is cataloged as CVE-2016-7406. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Dropbear SSH up to 2016 (SSH Server Software). This affects some unknown processing. The manipulation of the argument username/host with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Format string vulnerability in Dropbear SSH before 2016.74 allows remote attackers to execute arbitrary code via format string specifiers in the (1) username or (2) host argument.

The bug was discovered 09/14/2016. The weakness was shared 03/03/2017 by Matt Johnston (oss-sec). The advisory is shared at openwall.com. This vulnerability is uniquely identified as CVE-2016-7406 since 09/09/2016. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 159 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 92974†). The entries VDB-97512, VDB-97510 and VDB-97511 are related to this item. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.4

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
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: 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 🔍
11/04/2025 +3167 days 🔍

Sourcesinfo

Advisory: openwall.com
Researcher: Matt Johnston
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-7406 (🔍)
GCVE (CVE): GCVE-0-2016-7406
GCVE (VulDB): GCVE-100-97509
SecurityFocus: 92974 - Dropbear SSH CVE-2016-7406 Format String Vulnerability
OSVDB: - CVE-2016-7406 - Dropbear SSH - Format String Issue

See also: 🔍

Entryinfo

Created: 03/04/2017 13:52
Updated: 11/04/2025 17:38
Changes: 03/04/2017 13:52 (77), 09/03/2020 18:35 (4), 11/04/2025 17:38 (20)
Complete: 🔍
Cache ID: 216::103

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