CVE-2019-11840

golang.org/x/crypto: Keystream loop in amd64 assembly when overflowing 32-bit counter

Severity Score

5.9

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

se descubrio un problema en Go cryptography libraries, también se conoce como golang-googlecode-go-crypto, anterior del 20-03-2019. Se encontró un fallo en la implementación de amd64 de golang.org/x/crypto/salsa20 y golang.org/x/crypto/salsa20/salsa. Si se generan más de 256 GiB de keystream, o si el contador crece más de 32 bits, la implementación de amd64 causará primero una salida incorrecta y entonces volverá a la secuencia de claves generada previamente. Los bytes repetidos de keystream pueden provocar la pérdida de confidencialidad en las aplicaciones de encriptación o la previsibilidad en las aplicaciones CSPRNG.

*Credits: N/A

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-05-09 CVE Reserved
2019-05-09 CVE Published
2024-08-04 CVE Updated
2024-11-08 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-330: Use of Insufficiently Random Values

CAPEC

References (12)

URL	Tag	Source
https://github.com/golang/go/issues/30965	Third Party Advisory
https://groups.google.com/forum/#%21msg/golang-announce/tjyNcJxb2vQ/n0NRBziSCAAJ
https://lists.debian.org/debian-lts-announce/2019/06/msg00029.html	Mailing List
https://lists.debian.org/debian-lts-announce/2020/10/msg00014.html	Mailing List
https://lists.debian.org/debian-lts-announce/2020/11/msg00016.html	Mailing List
https://lists.debian.org/debian-lts-announce/2020/11/msg00030.html	Mailing List
https://lists.debian.org/debian-lts-announce/2021/01/msg00015.html	Mailing List
https://lists.debian.org/debian-lts-announce/2023/06/msg00017.html	Mailing List
https://pkg.go.dev/vuln/GO-2022-0209

URL	Date	SRC

URL	Date	SRC
https://go.googlesource.com/crypto/+/b7391e95e576cacdcdd422573063bc057239113d	2024-05-14

URL	Date	SRC
https://bugzilla.redhat.com/show_bug.cgi?id=1691529	2021-01-20
https://access.redhat.com/security/cve/CVE-2019-11840	2021-01-20

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Golang Search vendor "Golang"		Crypto Search vendor "Golang" for product "Crypto"				< 2019-03-20 Search vendor "Golang" for product "Crypto" and version " < 2019-03-20"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				8.0 Search vendor "Debian" for product "Debian Linux" and version "8.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected