OpenSSL up to 1.0.2d x86_64 Montgomery Squaring Procedure Private Key information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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6.5$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in OpenSSL up to 1.0.2d. Affected by this issue is some unknown functionality of the component x86_64 Montgomery Squaring Procedure. The manipulation results in information disclosure (Private Key). This vulnerability is known as CVE-2015-3193. It is possible to launch the attack remotely. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in OpenSSL up to 1.0.2d (Network Encryption Software). Affected is some unknown functionality of the component x86_64 Montgomery Squaring Procedure. The manipulation with an unknown input leads to a information disclosure vulnerability (Private Key). CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality, and availability.

The weakness was published 12/03/2015 by Hanno Böck as 20151203.txt as confirmed advisory (Website). The advisory is available at openssl.org. The public release has been coordinated with the vendor. This vulnerability is traded as CVE-2015-3193 since 04/10/2015. The exploitability is told to be easy. 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 T1592 by the MITRE ATT&CK project. The advisory points out:

There is a carry propagating bug in the x86_64 Montgomery squaring procedure. 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 DH are considered just feasible (although very difficult) 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 very significant and likely only accessible to a limited number of attackers. An attacker would additionally need online access to an unpatched system using the target private key in a scenario with persistent DH parameters and a private key that is shared between multiple clients. For example this can occur by default in OpenSSL DHE based SSL/TLS ciphersuites.

The vulnerability was handled as a non-public zero-day exploit for at least 112 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 87213 (FreeBSD : openssl -- multiple vulnerabilities (4c8d1d72-9b38-11e5-aece-d050996490d0)), 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 170609 (SUSE Enterprise Linux Security Update for openssl (SUSE-SU-2017:3343-1)).

Upgrading to version 1.0.2e 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 X-Force (108502), Tenable (87213), SecurityFocus (BID 91787†) and Vulnerability Center (SBV-54813†). Similar entries are available at VDB-76354, VDB-78584, VDB-78603 and VDB-78601. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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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: 7.5
VulDB Meta Temp Score: 6.5

VulDB Base Score: 7.5
VulDB Temp Score: 6.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

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

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 87213
Nessus Name: FreeBSD : openssl -- multiple vulnerabilities (4c8d1d72-9b38-11e5-aece-d050996490d0)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 800316
OpenVAS Name: Cisco Adaptive Security Appliance Multiple Vulnerabilities in OpenSSL
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 1.0.2e
Patch: d73cc256c8e256c32ed959456101b73ba9842f72

Timelineinfo

04/10/2015 🔍
08/13/2015 +125 days 🔍
12/03/2015 +112 days 🔍
12/03/2015 +0 days 🔍
12/04/2015 +1 days 🔍
12/04/2015 +0 days 🔍
12/06/2015 +2 days 🔍
12/07/2015 +1 days 🔍
12/07/2015 +0 days 🔍
06/28/2022 +2395 days 🔍

Sourcesinfo

Product: openssl.org

Advisory: 20151203.txt
Researcher: Hanno Böck
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2015-3193 (🔍)
GCVE (CVE): GCVE-0-2015-3193
GCVE (VulDB): GCVE-100-79410
X-Force: 108502 - OpenSSL x86_64 Montgomery squaring procedure information disclosure
SecurityFocus: 91787
SecurityTracker: 1034294
Vulnerability Center: 54813 - OpenSSL 1.0.2 - 1.0.2d Remote Information Disclosure due to Diffie-Hellman Issue, Medium

See also: 🔍

Entryinfo

Created: 12/04/2015 10:17
Updated: 06/28/2022 14:13
Changes: 12/04/2015 10:17 (63), 05/11/2018 12:58 (20), 06/28/2022 14:13 (5)
Complete: 🔍
Cache ID: 216:658:103

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