OpenSSH up to 7.3 sshd kex.c/packet.c NEWKEYS Message null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in OpenSSH up to 7.3. Affected by this issue is some unknown functionality of the file kex.c/packet.c of the component sshd. This manipulation as part of NEWKEYS Message causes null pointer dereference. This vulnerability is tracked as CVE-2016-10708. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in OpenSSH up to 7.3 (Connectivity Software). Affected by this vulnerability is an unknown functionality of the file kex.c/packet.c of the component sshd. The manipulation as part of a NEWKEYS Message leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. The summary by CVE is:

sshd in OpenSSH before 7.4 allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via an out-of-sequence NEWKEYS message, as demonstrated by Honggfuzz, related to kex.c and packet.c.

The bug was discovered 10/04/2016. The weakness was disclosed 01/21/2018 (Website). It is possible to read the advisory at blog.swiecki.net. This vulnerability is known as CVE-2016-10708 since 01/21/2018. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 474 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 106407 (Debian DLA-1257-1 : openssh security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 197294 (Ubuntu Security Notification for Openssh Vulnerabilities (USN-3809-1)).

Upgrading to version 7.4 eliminates this vulnerability.Proper firewalling of tcp/22 (ssh) is able to address this issue. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published 5 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (106407) and SecurityFocus (BID 102780†). The entries VDB-115920, VDB-123011, VDB-124791 and VDB-125264 are pretty similar. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

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

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / 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: 106407
Nessus Name: Debian DLA-1257-1 : openssh security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 881559
OpenVAS Name: OpenSSH Multiple Vulnerabilities Jan17 (Windows)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: OpenSSH 7.4
Patch: anongit.mindrot.org
Firewalling: 🔍

Timelineinfo

10/04/2016 🔍
01/21/2018 +474 days 🔍
01/21/2018 +0 days 🔍
01/21/2018 +0 days 🔍
01/21/2018 +0 days 🔍
01/22/2018 +1 days 🔍
01/26/2018 +4 days 🔍
01/29/2018 +3 days 🔍
02/02/2023 +1830 days 🔍

Sourcesinfo

Advisory: K32485746
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-10708 (🔍)
GCVE (CVE): GCVE-0-2016-10708
GCVE (VulDB): GCVE-100-112267
SecurityFocus: 102780 - OpenSSH CVE-2016-10708 Multiple Denial of Service Vulnerabilities

See also: 🔍

Entryinfo

Created: 01/22/2018 07:52
Updated: 02/02/2023 11:04
Changes: 01/22/2018 07:52 (81), 12/26/2019 11:09 (5), 02/02/2023 10:58 (5), 02/02/2023 11:04 (1)
Complete: 🔍
Cache ID: 216:C48:103

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