Yubico libykpiv up to 2.0.x RSA Key Generation lib/util.c Length Field information disclosure

entryeditHistoryDiffjsonxmlCTI
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.
3.0$0-$5k0.00

A vulnerability, which was classified as problematic, was found in Yubico libykpiv up to 2.0.x. This affects an unknown functionality in the library lib/util.c of the component RSA Key Generation. The manipulation as part of a Length Field leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. This is going to have an impact on confidentiality. The summary by CVE is:

An issue was discovered in Yubico libykpiv before 2.1.0. lib/util.c in this library (which is included in yubico-piv-tool) does not properly check embedded length fields during device communication. A malicious PIV token can misreport the returned length fields during RSA key generation. This will cause stack memory to be copied into heap allocated memory that gets returned to the caller. The leaked memory could include PINs, passwords, key material, and other sensitive information depending on the integration. During further processing by the caller, this information could leak across trust boundaries. Note that RSA key generation is triggered by the host and cannot directly be triggered by the token.

The weakness was shared 07/09/2020 (Website). The advisory is shared at yubico.com. This vulnerability is uniquely identified as CVE-2020-13131 since 05/18/2020. An attack has to be approached locally. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

Upgrading to version 2.1.0 eliminates this vulnerability.

The entry 157810 is related to this item.

Productinfoedit

Vendor

Name

CPE 2.3infoedit

CPE 2.2infoedit

CVSSv3infoedit

VulDB Meta Base Score: 3.2
VulDB Meta Temp Score: 3.0

VulDB Base Score: 2.1
VulDB Temp Score: 2.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 4.3
NVD Vector: 🔒

CVSSv2infoedit

AVACAuCIA
🔍🔍🔍🔍🔍🔍
🔍🔍🔍🔍🔍🔍
🔍🔍🔍🔍🔍🔍
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
unlockunlockunlockunlockunlockunlock
unlockunlockunlockunlockunlockunlock
unlockunlockunlockunlockunlockunlock

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

Exploitinginfoedit

Class: Information disclosure
CWE: CWE-200
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Dayunlockunlockunlockunlock
Todayunlockunlockunlockunlock

Threat Intelligenceinfoedit

Threat: 🔍
Adversaries: 🔍
Geopolitics: 🔍
Economy: 🔍
Predictions: 🔍
Remediation: 🔍

Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: libykpiv 2.1.0

Timelineinfoedit

05/18/2020 CVE assigned
07/09/2020 +52 days Advisory disclosed
07/10/2020 +1 days VulDB entry created
10/29/2020 +111 days VulDB last update

Sourcesinfoedit

Advisory: yubico.com
Status: Not defined
Confirmation: 🔒

CVE: CVE-2020-13131 (🔒)
See also: 🔒

Entryinfoedit

Created: 07/10/2020 08:46 AM
Updated: 10/29/2020 09:59 AM
Changes: (1) source_cve_cna
Complete: 🔍

Comments

No comments yet. Please log in to comment.

Do you want to use VulDB in your project?

Use the official API to access entries easily!