OpenSSL up to 1.0.2m Montgomery Multiplication rsaz_1024_mul_avx2 information disclosure

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.
5.6	$0-$5k	0.00

Summaryinfo

A vulnerability was found in OpenSSL up to 1.0.2m and classified as critical. This affects the function rsaz_1024_mul_avx2 of the component Montgomery Multiplication. Executing a manipulation can lead to information disclosure. This vulnerability appears as CVE-2017-3738. The attack may be performed from remote. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in OpenSSL up to 1.0.2m (Network Encryption Software). It has been declared as critical. This vulnerability affects the function rsaz_1024_mul_avx2 of the component Montgomery Multiplication. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

There is an overflow bug in the AVX2 Montgomery multiplication procedure used in exponentiation with 1024-bit moduli. No EC algorithms are affected. Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH1024 are considered just feasible, because most of the work necessary to deduce information about a private key may be performed offline. The amount of resources required for such an attack would be significant. However, for an attack on TLS to be meaningful, the server would have to share the DH1024 private key among multiple clients, which is no longer an option since CVE-2016-0701. This only affects processors that support the AVX2 but not ADX extensions like Intel Haswell (4th generation). Note: The impact from this issue is similar to CVE-2017-3736, CVE-2017-3732 and CVE-2015-3193. OpenSSL version 1.0.2-1.0.2m and 1.1.0-1.1.0g are affected. Fixed in OpenSSL 1.0.2n. Due to the low severity of this issue we are not issuing a new release of OpenSSL 1.1.0 at this time. The fix will be included in OpenSSL 1.1.0h when it becomes available. The fix is also available in commit e502cc86d in the OpenSSL git repository.

The bug was discovered 12/07/2017. The weakness was presented 12/07/2017 as 20171207.txt as confirmed security advisory (Website). The advisory is available at openssl.org. This vulnerability was named CVE-2017-3738 since 12/16/2016. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 105341 (openSUSE Security Update : openssl (openSUSE-2017-1381)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE 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)).

Upgrading to version 1.0.2n 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 Tenable (105341) and SecurityFocus (BID 102118†). See VDB-92314, VDB-92773, VDB-92782 and VDB-92786 for similar entries. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Network Encryption Software

Name

• OpenSSL

Version

• 1.0.2
• 1.0.2a
• 1.0.2b
• 1.0.2c
• 1.0.2d
• 1.0.2e
• 1.0.2f
• 1.0.2g
• 1.0.2h
• 1.0.2i
• 1.0.2j
• 1.0.2k
• 1.0.2l
• 1.0.2m

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: 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

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

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: 105341
Nessus Name: openSUSE Security Update : openssl (openSUSE-2017-1381)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 863145
OpenVAS Name: Debian Security Advisory DSA 4065-1 (openssl1.0 - security update)
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 1.0.2n
Patch: github.com

Timelineinfo

12/16/2016 🔍
12/07/2017 +356 days 🔍
12/07/2017 +0 days 🔍
12/07/2017 +0 days 🔍
12/07/2017 +0 days 🔍
12/07/2017 +0 days 🔍
12/07/2017 +0 days 🔍
12/18/2017 +11 days 🔍
01/17/2023 +1856 days 🔍

Sourcesinfo

Product: openssl.org

Advisory: 20171207.txt
Researcher: David Benjamin
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-3738 (🔍)
GCVE (CVE): GCVE-0-2017-3738
GCVE (VulDB): GCVE-100-110338

OVAL: 🔍

SecurityFocus: 102118 - OpenSSL CVE-2017-3738 Information Disclosure Vulnerability
SecurityTracker: 1039978

See also: 🔍

Entryinfo

Created: 12/07/2017 23:34
Updated: 01/17/2023 09:47
Changes: 12/07/2017 23:34 (79), 12/12/2019 19:59 (4), 01/26/2021 08:35 (3), 01/26/2021 08:40 (1), 01/17/2023 09:47 (3)
Complete: 🔍
Cache ID: 216:680:103

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

Discussion

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