Google Go Crypto Library Keystream random values

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.
5.6	$0-$5k	0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in Google Go. This issue affects some unknown processing of the component Crypto Library. Such manipulation as part of Keystream leads to random values. This vulnerability is traded as CVE-2019-11840. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Google Go (Programming Language Software) (affected version unknown). Affected by this issue is an unknown functionality of the component Crypto Library. The manipulation as part of a Keystream leads to a random values vulnerability. Using CWE to declare the problem leads to CWE-330. The product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers. Impacted is confidentiality, integrity, and availability. CVE summarizes:

An issue was discovered in the supplementary Go cryptography library, golang.org/x/crypto, before v0.0.0-20190320223903-b7391e95e576. A flaw was found in the amd64 implementation of the golang.org/x/crypto/salsa20 and golang.org/x/crypto/salsa20/salsa packages. If more than 256 GiB of keystream is generated, or if the counter otherwise grows greater than 32 bits, the amd64 implementation will first generate incorrect output, and then cycle back to previously generated keystream. Repeated keystream bytes can lead to loss of confidentiality in encryption applications, or to predictability in CSPRNG applications.

The bug was discovered 05/09/2019. The weakness was shared 05/09/2019 (Website). The advisory is available at lists.debian.org. This vulnerability is handled as CVE-2019-11840 since 05/09/2019. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1600.001 by the MITRE ATT&CK project.

Upgrading eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

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Productinfo

Type

Programming Language Software

Vendor

Google

Name

License

open-source

Website

Vendor: https://www.google.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.6

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
NVD Vector: 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Random values
CWE: CWE-330 / CWE-310
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

03/20/2019 🔍
05/09/2019 +50 days 🔍
05/09/2019 +0 days 🔍
05/09/2019 +0 days 🔍
05/10/2019 +1 days 🔍
05/18/2026 +2565 days 🔍

Sourcesinfo

Vendor: google.com

Advisory: 30965
Status: Confirmed

CVE: CVE-2019-11840 (🔍)
GCVE (CVE): GCVE-0-2019-11840
GCVE (VulDB): GCVE-100-134534

Entryinfo

Created: 05/10/2019 06:42
Updated: 05/18/2026 17:05
Changes: 05/10/2019 06:42 (56), 06/08/2020 15:50 (2), 09/15/2023 10:52 (4), 09/15/2023 10:58 (1), 05/18/2026 17:05 (18)
Complete: 🔍
Cache ID: 216::103