CPU Multi-Threading Timing 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
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5.5$0-$5k0.00

A vulnerability classified as critical was found in CPU (Chip Software) (version now known). Affected by this vulnerability is some unknown processing of the component Multi-Threading. The manipulation as part of a Timing 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. The summary by CVE is:

Simultaneous Multi-threading (SMT) in processors can enable local users to exploit software vulnerable to timing attacks via a side-channel timing attack on 'port contention'.

The bug was discovered 11/02/2018. The weakness was disclosed 11/15/2018 (Website). The advisory is shared at securityfocus.com. This vulnerability is known as CVE-2018-5407 since 01/12/2018. An attack has to be approached locally. The exploitation doesn't need any form of authentication. Technical details are unknown but a public exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

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 13 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 119139 (openSUSE Security Update : openssl (openSUSE-2018-1464)), 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 176538 (Debian Security Update for openssl (DSA 4348-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (119139) and Exploit-DB (45785). The entries 126017, 126127, 127258 and 127259 are pretty similar.

Productinfo

Type

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.5

VulDB Base Score: 7.0
VulDB Temp Score: 6.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 4.7
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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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
ATT&CK: T1592

Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 119139
Nessus Name: openSUSE Security Update : openssl (openSUSE-2018-1464)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

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: 🔍

Timelineinfo

01/12/2018 🔍
10/30/2018 +291 days 🔍
11/02/2018 +3 days 🔍
11/15/2018 +13 days 🔍
11/15/2018 +0 days 🔍
11/16/2018 +1 days 🔍
11/24/2018 +8 days 🔍
11/26/2018 +2 days 🔍
06/06/2023 +1653 days 🔍

Sourcesinfo

Advisory: RHSA-2019:0483⛔
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-5407 (🔍)
OVAL: 🔍

SecurityFocus: 105897 - OpenSSL CVE-2018-5407 Side Channel Attack Information Disclosure Vulnerability

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

Entryinfo

Created: 11/16/2018 07:45
Updated: 06/06/2023 16:54
Changes: 11/16/2018 07:45 (77), 04/13/2020 16:39 (9), 06/06/2023 16:54 (4)
Complete: 🔍

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