ARM mbed TLS up to 2.1.16/2.7.7/2.14.0 RSA Decryption cryptographic issue

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.
4.9	$0-$5k	0.00

Summaryinfo

A vulnerability marked as critical has been reported in ARM mbed TLS up to 2.1.16/2.7.7/2.14.0. This vulnerability affects unknown code of the component RSA Decryption. This manipulation causes cryptographic issue. This vulnerability is tracked as CVE-2018-19608. The attack is restricted to local execution. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in ARM mbed TLS up to 2.1.16/2.7.7/2.14.0. It has been declared as critical. Affected by this vulnerability is an unknown code of the component RSA Decryption. The manipulation with an unknown input leads to a cryptographic issue vulnerability. The CWE definition for the vulnerability is CWE-310. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Arm Mbed TLS before 2.14.1, before 2.7.8, and before 2.1.17 allows a local unprivileged attacker to recover the plaintext of RSA decryption, which is used in RSA-without-(EC)DH(E) cipher suites.

The bug was discovered 11/30/2018. The weakness was disclosed 12/05/2018 (Website). The advisory is shared at tls.mbed.org. This vulnerability is known as CVE-2018-19608 since 11/27/2018. An attack has to be approached locally. 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 T1600 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 5 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 119698 (FreeBSD : Mbed TLS -- Local timing attack on RSA decryption (293f40a0-ffa1-11e8-b258-0011d823eebd)), 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 277620 (Fedora Security Update for mbedtls (FEDORA-2018-571ea64f3d)).

Upgrading to version 2.1.17, 2.7.8 or 2.14.1 eliminates this vulnerability. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (119698). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• ARM mbed TLS

Version

• 2.0
• 2.1
• 2.1.0
• 2.1.1
• 2.1.2
• 2.1.3
• 2.1.4
• 2.1.5
• 2.1.6
• 2.1.7
• 2.1.8
• 2.1.9
• 2.1.10
• 2.1.11
• 2.1.12
• 2.1.13
• 2.1.14
• 2.1.15
• 2.1.16
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.7.0
• 2.7.1
• 2.7.2
• 2.7.3
• 2.7.4
• 2.7.5
• 2.7.6
• 2.7.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14.0

License

• commercial

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.0
VulDB Meta Temp Score: 4.9

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 4.7
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Cryptographic issue
CWE: CWE-310
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

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: 119698
Nessus Name: FreeBSD : Mbed TLS -- Local timing attack on RSA decryption (293f40a0-ffa1-11e8-b258-0011d823eebd)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: ARM mbed TLS 2.1.17/2.7.8/2.14.1

Timelineinfo

11/27/2018 🔍
11/30/2018 +3 days 🔍
12/05/2018 +5 days 🔍
12/05/2018 +0 days 🔍
12/06/2018 +1 days 🔍
12/14/2018 +8 days 🔍
12/17/2018 +3 days 🔍
06/05/2026 +2727 days 🔍

Sourcesinfo

Advisory: tls.mbed.org
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-19608 (🔍)
GCVE (CVE): GCVE-0-2018-19608
GCVE (VulDB): GCVE-100-127537

Entryinfo

Created: 12/06/2018 08:03
Updated: 06/05/2026 22:13
Changes: 12/06/2018 08:03 (72), 04/17/2020 18:55 (3), 06/05/2026 22:13 (19)
Complete: 🔍
Cache ID: 216::103

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

Discussion

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