VDB-114937 · CVE-2018-8934 · Qualys 370876

AMD Ryzen/Ryzen Pro Promontory Chipset CHIMERA-FW access control

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.7$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in AMD Ryzen and Ryzen Pro. This impacts an unknown function of the component Promontory Chipset. This manipulation causes access control (CHIMERA-FW). This vulnerability is tracked as CVE-2018-8934. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in AMD Ryzen and Ryzen Pro (the affected version is unknown). It has been declared as critical. Affected by this vulnerability is an unknown code of the component Promontory Chipset. The manipulation with an unknown input leads to a access control vulnerability (CHIMERA-FW). The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The Promontory chipset, as used in AMD Ryzen and Ryzen Pro platforms, has a backdoor in firmware, aka CHIMERA-FW.

The bug was discovered 03/13/2018. The weakness was disclosed 03/22/2018 (Website). The advisory is shared at amdflaws.com. This vulnerability is known as CVE-2018-8934 since 03/22/2018. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 9 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370876 (AMD Processors Multiple Security Vulnerabilities (RYZENFALL/MASTERKEY/CHIMERA-FW/FALLOUT)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The entries VDB-114933, VDB-114934, VDB-114935 and VDB-114936 are pretty similar. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.7
VulDB Meta Temp Score: 7.7

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

NVD Base Score: 9.0
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

Name: CHIMERA-FW
Class: Access control / CHIMERA-FW
CWE: CWE-264
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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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

03/13/2018 🔍
03/22/2018 +9 days 🔍
03/22/2018 +0 days 🔍
03/22/2018 +0 days 🔍
03/23/2018 +1 days 🔍
01/16/2020 +664 days 🔍

Sourcesinfo

Advisory: amdflaws.com
Status: Not defined

CVE: CVE-2018-8934 (🔍)
GCVE (CVE): GCVE-0-2018-8934
GCVE (VulDB): GCVE-100-114937
See also: 🔍

Entryinfo

Created: 03/23/2018 10:35
Updated: 01/16/2020 08:18
Changes: 03/23/2018 10:35 (60), 01/16/2020 08:18 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

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