OpenSSL up to 1.1.0c DHE/ECDHE Key Exchange null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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6.1$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in OpenSSL up to 1.1.0c. The impacted element is an unknown function of the component DHE/ECDHE Key Exchange. This manipulation causes null pointer dereference. This vulnerability is tracked as CVE-2017-3730. The attack is possible to be carried out remotely. Moreover, an exploit is present. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in OpenSSL up to 1.1.0c (Network Encryption Software). It has been declared as problematic. Affected by this vulnerability is an unknown code of the component DHE/ECDHE Key Exchange. The manipulation with an unknown input 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 bug was discovered 01/26/2017. The weakness was disclosed 01/26/2017 by Guido Vranken as 20170126.txt as confirmed security advisory (Website). The advisory is shared at openssl.org. The public release has been coordinated in cooperation with the project team. This vulnerability is known as CVE-2017-3730 since 12/16/2016. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are unknown but a public exploit is available. The advisory points out:

If a malicious server supplies bad parameters for a DHE or ECDHE key exchange then this can result in the client attempting to dereference a NULL pointer leading to a client crash. This could be exploited in a Denial of Service attack.

It is possible to download the exploit 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 12 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 96821 (FreeBSD : OpenSSL -- multiple vulnerabilities (d455708a-e3d3-11e6-9940-b499baebfeaf)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 43662 (Fortigate FortiOS Denial of Service Vulnerability (FG-IR-17-019)).

Upgrading to version 1.0.2k or 1.1.0d eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (41192), Tenable (96821), SecurityFocus (BID 95812†) and SecurityTracker (ID 1037717†). Additional details are provided at mta.openssl.org. The entries VDB-68431, VDB-89667, VDB-92931 and VDB-95678 are pretty similar. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Not Affected

  • OpenSSL up to 1.0.2

Productinfo

Type

Name

Version

License

Support

  • end of life (old version)

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.1

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
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: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 96821
Nessus Name: FreeBSD : OpenSSL -- multiple vulnerabilities (d455708a-e3d3-11e6-9940-b499baebfeaf)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 800489
OpenVAS Name: OpenSSL Bad (EC)DHE Parameters DoS Vulnerability (Windows)
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: OpenSSL 1.0.2k/1.1.0d
Patch: github.com

Timelineinfo

12/16/2016 🔍
01/14/2017 +29 days 🔍
01/26/2017 +12 days 🔍
01/26/2017 +0 days 🔍
01/26/2017 +0 days 🔍
01/26/2017 +0 days 🔍
01/26/2017 +0 days 🔍
01/27/2017 +1 days 🔍
01/27/2017 +0 days 🔍
05/04/2017 +97 days 🔍
04/06/2025 +2894 days 🔍

Sourcesinfo

Product: openssl.org

Advisory: 20170126.txt
Researcher: Guido Vranken
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2017-3730 (🔍)
GCVE (CVE): GCVE-0-2017-3730
GCVE (VulDB): GCVE-100-96037

OVAL: 🔍

SecurityFocus: 95812 - OpenSSL CVE-2017-3730 NULL Pointer Dereference Denial of Service Vulnerability
OSVDB: - CVE-2017-3730 - OpenSSL - Denial of Service Issue
SecurityTracker: 1037717

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

Entryinfo

Created: 01/27/2017 08:16
Updated: 04/06/2025 13:49
Changes: 01/27/2017 08:16 (90), 08/04/2020 18:03 (9), 11/04/2022 09:47 (4), 04/06/2025 13:49 (14)
Complete: 🔍
Cache ID: 216::103

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