OpenSSL up to 1.0.1u crypto/ec/ecdsa_ossl.c ecdsa_sign_setup key management

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.7	$0-$5k	0.00

Summaryinfo

A vulnerability was found in OpenSSL up to 1.0.1u. It has been classified as problematic. This issue affects the function ecdsa_sign_setup of the file crypto/ec/ecdsa_ossl.c. This manipulation causes key management. This vulnerability is registered as CVE-2016-7056. The attack needs to be launched locally. No exploit is available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability classified as problematic was found in OpenSSL up to 1.0.1u (Network Encryption Software). Affected by this vulnerability is the function ecdsa_sign_setup of the file crypto/ec/ecdsa_ossl.c. The manipulation with an unknown input leads to a key management vulnerability. The CWE definition for the vulnerability is CWE-320. As an impact it is known to affect confidentiality. The summary by CVE is:

A timing attack flaw was found in OpenSSL 1.0.1u and before that could allow a malicious user with local access to recover ECDSA P-256 private keys.

The bug was discovered 01/10/2017. The weakness was published 01/10/2017 by Cesar Pereida García and Billy Bob Brumley as Cryptology ePrint Report 2016/1195 as confirmed paper (Website). It is possible to read the advisory at ia.cr. The public release has been coordinated with the project team. This vulnerability is known as CVE-2016-7056 since 08/23/2016. Attacking locally is a requirement. The requirement for exploitation is a single authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1600.001 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 22 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 99134 (macOS 10.12.x < 10.12.4 Multiple Vulnerabilities (httpoxy)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family MacOS X Local Security Checks and running in the context c. The commercial vulnerability scanner Qualys is able to test this issue with plugin 175949 (Debian Security Update for openssl (DSA 3773-1)).

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

The vulnerability is also documented in the databases at Tenable (99134), SecurityFocus (BID 95375†) and SecurityTracker (ID 1037575†). Similar entries are available at VDB-93073, VDB-93752, VDB-94628 and VDB-96036. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Network Encryption Software

Name

• OpenSSL

Version

• 1.0.1a
• 1.0.1b
• 1.0.1c
• 1.0.1d
• 1.0.1e
• 1.0.1f
• 1.0.1g
• 1.0.1h
• 1.0.1i
• 1.0.1j
• 1.0.1k
• 1.0.1l
• 1.0.1m
• 1.0.1n
• 1.0.1o
• 1.0.1p
• 1.0.1q
• 1.0.1r
• 1.0.1s
• 1.0.1t
• 1.0.1u

License

• open-source

Support

• end of life (old version)

Website

• Product: https://www.openssl.org/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.7

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CNA Base Score: 5.5
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Key management
CWE: CWE-320
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 99134
Nessus Name: macOS 10.12.x < 10.12.4 Multiple Vulnerabilities (httpoxy)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 801105
OpenVAS Name: Apple Mac OS X Multiple Vulnerabilities-HT207615
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Patch: 8aed2a7548362e88e84a7feb795a3a97e8395008

Timelineinfo

08/23/2016 🔍
12/19/2016 +118 days 🔍
01/10/2017 +22 days 🔍
01/10/2017 +0 days 🔍
01/10/2017 +0 days 🔍
01/10/2017 +0 days 🔍
01/10/2017 +0 days 🔍
01/13/2017 +3 days 🔍
03/31/2017 +77 days 🔍
09/10/2018 +528 days 🔍
10/28/2022 +1509 days 🔍

Sourcesinfo

Product: openssl.org

Advisory: Cryptology ePrint Report 2016/1195
Researcher: Cesar Pereida García, Billy Bob Brumley
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2016-7056 (🔍)
GCVE (CVE): GCVE-0-2016-7056
GCVE (VulDB): GCVE-100-95275

OVAL: 🔍

SecurityFocus: 95375 - OpenSSL CVE-2016-7056 Local Information Disclosure Vulnerability
OSVDB: - CVE-2016-7056 - OpenSSL - Timing Attack Issue
SecurityTracker: 1037575

See also: 🔍

Entryinfo

Created: 01/13/2017 11:33
Updated: 10/28/2022 14:21
Changes: 01/13/2017 11:33 (76), 07/21/2020 11:40 (17), 10/28/2022 14:17 (3), 10/28/2022 14:21 (12)
Complete: 🔍
Cache ID: 216::103

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