Trusted Firmware mbed TLS up to 2.23.0 library/ssl_msg.c mbedtls_ssl_decrypt_buf information exposure

CVSS Meta Temp Score
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CTI Interest Score
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4.2$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in Trusted Firmware mbed TLS up to 2.23.0. Affected by this vulnerability is the function mbedtls_ssl_decrypt_buf of the file library/ssl_msg.c. Such manipulation leads to information exposure. This vulnerability is uniquely identified as CVE-2020-16150. Local access is required to approach this attack. No exploit exists.

Detailsinfo

A vulnerability was found in Trusted Firmware mbed TLS up to 2.23.0 (Firmware Software). It has been rated as problematic. Affected by this issue is the function mbedtls_ssl_decrypt_buf of the file library/ssl_msg.c. The manipulation with an unknown input leads to a information exposure vulnerability. Using CWE to declare the problem leads to CWE-203. The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not. Impacted is confidentiality. CVE summarizes:

A Lucky 13 timing side channel in mbedtls_ssl_decrypt_buf in library/ssl_msg.c in Trusted Firmware Mbed TLS through 2.23.0 allows an attacker to recover secret key information. This affects CBC mode because of a computed time difference based on a padding length.

The weakness was disclosed 09/02/2020 (Website). The advisory is available at tls.mbed.org. This vulnerability is handled as CVE-2020-16150 since 07/30/2020. The exploitation is known to be difficult. Local access is required to approach this attack. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

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

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Productinfo

Type

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.2
VulDB Meta Temp Score: 4.2

VulDB Base Score: 2.9
VulDB Temp Score: 2.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
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

Class: Information exposure
CWE: CWE-203 / CWE-200 / CWE-284
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

07/30/2020 🔍
09/02/2020 +34 days 🔍
09/02/2020 +0 days 🔍
11/12/2020 +71 days 🔍

Sourcesinfo

Advisory: tls.mbed.org
Status: Not defined
Confirmation: 🔍

CVE: CVE-2020-16150 (🔍)
GCVE (CVE): GCVE-0-2020-16150
GCVE (VulDB): GCVE-100-160622

Entryinfo

Created: 09/02/2020 21:43
Updated: 11/12/2020 13:16
Changes: 09/02/2020 21:43 (39), 09/02/2020 21:48 (18), 11/11/2020 08:10 (1), 11/12/2020 13:16 (1)
Complete: 🔍
Cache ID: 216::103

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