OpenSSH Key Exchange Initialization kex_input_kexinit resource management ⚔ [Disputed]

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

Summaryinfo

A vulnerability identified as problematic has been detected in OpenSSH. This vulnerability affects the function kex_input_kexinit of the component Key Exchange Initialization. Performing a manipulation results in resource management. This vulnerability is reported as CVE-2016-8858. The attack is possible to be carried out remotely. No exploit exists. The existence of this vulnerability is still disputed at present. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability classified as critical has been found in OpenSSH (Connectivity Software) (affected version not known). This affects the function kex_input_kexinit of the component Key Exchange Initialization. The manipulation with an unknown input leads to a resource management vulnerability. CWE is classifying the issue as CWE-399. This is going to have an impact on availability.

The bug was discovered 10/19/2016. The weakness was disclosed 10/10/2016 by Shi Lei as Revision 1.127 as confirmed patch (CVS). The advisory is shared at cvsweb.openbsd.org. The public release has been coordinated in cooperation with the project team. This vulnerability is uniquely identified as CVE-2016-8858 since 10/19/2016. The exploitability is told to be easy. It is possible to initiate the attack remotely. A authentication is required for exploitation. Technical details are known, but no exploit is available. The advisory points out:

Unregister the KEXINIT handler after message has been received. Otherwise an unauthenticated peer can repeat the KEXINIT and cause allocation of up to 128MB -- until the connection is closed.

The real existence of this vulnerability is still doubted at the moment. The vulnerability scanner Nessus provides a plugin with the ID 95604 (GLSA-201612-18 : OpenSSH: 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 38753 (NetApp Clustered Data ONTAP Multiple Vulnerabilities (NTAP-20171208-0001,NTAP-20180201-0001,NTAP-20171107-0002)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at cvsweb.openbsd.org. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (95604), SecurityFocus (BID 93776†) and SecurityTracker (ID 1037057†). The entries VDB-108909, VDB-110337, VDB-110338 and VDB-111966 are pretty similar. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.4

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 7.5
CNA 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: Resource management
CWE: CWE-399 / 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: 95604
Nessus Name: GLSA-201612-18 : OpenSSH: Multiple vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Patch: cvsweb.openbsd.org

Timelineinfo

10/10/2016 🔍
10/10/2016 +0 days 🔍
10/19/2016 +9 days 🔍
10/19/2016 +0 days 🔍
10/19/2016 +0 days 🔍
10/19/2016 +0 days 🔍
10/20/2016 +1 days 🔍
12/07/2016 +48 days 🔍
12/09/2016 +2 days 🔍
08/06/2024 +2797 days 🔍

Sourcesinfo

Advisory: Revision 1.127
Researcher: Shi Lei
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍
Disputed: 🔍

CVE: CVE-2016-8858 (🔍)
GCVE (CVE): GCVE-0-2016-8858
GCVE (VulDB): GCVE-100-92997

OVAL: 🔍

SecurityFocus: 93776 - OpenSSH 'ssh/kex.c' Denial of Service Vulnerability
SecurityTracker: 1037057

See also: 🔍

Entryinfo

Created: 10/20/2016 08:54
Updated: 08/06/2024 10:14
Changes: 10/20/2016 08:54 (70), 06/21/2019 16:22 (13), 09/28/2022 08:43 (4), 08/06/2024 10:14 (26)
Complete: 🔍
Cache ID: 216:595:103

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