OpenSSL 1.0.2/1.1.0/1.1.0a/1.1.0b Montgomery Multiplication key management

CVSS Meta Temp Score
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CTI Interest Score
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5.6$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in OpenSSL 1.0.2/1.1.0/1.1.0a/1.1.0b. This affects an unknown part of the component Montgomery Multiplication. The manipulation results in key management. This vulnerability is identified as CVE-2016-7055. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic has been found in OpenSSL 1.0.2/1.1.0/1.1.0a/1.1.0b (Network Encryption Software). Affected is an unknown code block of the component Montgomery Multiplication. The manipulation with an unknown input leads to a key management vulnerability. CWE is classifying the issue as CWE-320. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was released 11/10/2016 by Richard Morgan as 20161110.txt / FreeBSD-SA-17:02.openssl as confirmed security advisory (Website). The advisory is available at openssl.org. This vulnerability is traded as CVE-2016-7055. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1600.001 by the MITRE ATT&CK project. The advisory points out:

There is a carry propagating bug in the Broadwell-specific Montgomery multiplication procedure that handles input lengths divisible by, but longer than 256 bits. Analysis suggests that attacks against RSA, DSA and DH private keys are impossible. This is because the subroutine in question is not used in operations with the private key itself and an input of the attacker's direct choice. Otherwise the bug can manifest itself as transient authentication and key negotiation failures or reproducible erroneous outcome of public-key operations with specially crafted input. Among EC algorithms only Brainpool P-512 curves are affected and one presumably can attack ECDH key negotiation. Impact was not analyzed in detail, because pre-requisites for attack are considered unlikely. Namely multiple clients have to choose the curve in question and the server has to share the private key among them, neither of which is default behaviour. Even then only clients that chose the curve will be affected.

The vulnerability scanner Nessus provides a plugin with the ID 96985 (F5 Networks BIG-IP : OpenSSL vulnerability (K43570545)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family F5 Networks Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 371523 (IBM Cognos Business Intelligence Server Multiple Vulnerabilities (swg22004036)).

Upgrading to version 1.1.0c eliminates this vulnerability. Applying the patch 57c4b9f6a2 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published immediately after the disclosure of the vulnerability. The security advisory contains the following remark:

This issue does not affect OpenSSL versions prior to 1.0.2. Due to the low severity of this defect we are not issuing a new 1.0.2 release at this time. We recommend that 1.0.2 users wait for the next 1.0.2 release for the fix to become available.

The vulnerability is also documented in the databases at Tenable (96985), SecurityFocus (BID 94242†) and SecurityTracker (ID 1037261†). Entries connected to this vulnerability are available at VDB-92811, VDB-92879, VDB-93544 and VDB-93545. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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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: 5.7
VulDB Meta Temp Score: 5.6

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
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: Key management
CWE: CWE-320
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: 96985
Nessus Name: F5 Networks BIG-IP : OpenSSL vulnerability (K43570545)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 800489
OpenVAS Name: OpenSSL Montgomery Multiplication Denial of Service Vulnerability (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: OpenSSL 1.1.0c
Patch: 57c4b9f6a2

Timelineinfo

08/23/2016 🔍
11/10/2016 +79 days 🔍
11/10/2016 +0 days 🔍
11/10/2016 +0 days 🔍
11/10/2016 +0 days 🔍
05/04/2017 +175 days 🔍
10/03/2022 +1978 days 🔍

Sourcesinfo

Product: openssl.org

Advisory: 20161110.txt / FreeBSD-SA-17:02.openssl
Researcher: Richard Morgan
Status: Confirmed

CVE: CVE-2016-7055 (🔍)
GCVE (CVE): GCVE-0-2016-7055
GCVE (VulDB): GCVE-100-93546

OVAL: 🔍

SecurityFocus: 94242
SecurityTracker: 1037261 - OpenSSL Multiple Bugs Let Remote Users Cause the Target Application to Crash

See also: 🔍

Entryinfo

Created: 11/10/2016 20:08
Updated: 10/03/2022 09:56
Changes: 11/10/2016 20:08 (49), 02/24/2017 16:48 (23), 10/03/2022 07:30 (13), 10/03/2022 07:35 (1), 10/03/2022 07:40 (1), 10/03/2022 09:55 (2), 10/03/2022 09:56 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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