CVE-2020-10933

ruby: BasicSocket#read_nonblock method leads to information disclosure

Severity Score

5.3

*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 Ruby 2.5.x through 2.5.7, 2.6.x through 2.6.5, and 2.7.0. If a victim calls BasicSocket#read_nonblock(requested_size, buffer, exception: false), the method resizes the buffer to fit the requested size, but no data is copied. Thus, the buffer string provides the previous value of the heap. This may expose possibly sensitive data from the interpreter.

Se descubrió un problema en Ruby versiones 2.5.x hasta 2.5.7, versiones 2.6.x hasta 2.6.5, y versión 2.7.0. Si una víctima llama a BasicSocket#read_nonblock(requested_size, buffer, exception: false), el método redimensiona el buffer para ajustarlo al tamaño requerido, pero ningún dato es copiado. Por lo tanto, la cadena del búfer proporciona el valor previo de la pila. Esto puede exponer datos posiblemente confidenciales del intérprete.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-03-24 CVE Reserved
2020-05-04 CVE Published
2023-11-08 EPSS Updated
2024-08-04 CVE Updated
2024-08-04 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
CWE-908: Use of Uninitialized Resource

CAPEC

References (6)

URL	Tag	Source
https://security.netapp.com/advisory/ntap-20200625-0001	Third Party Advisory

URL	Date	SRC
https://www.ruby-lang.org/en/news/2020/03/31/heap-exposure-in-socket-cve-2020-10933	2024-08-04

URL	Date	SRC

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F4TNVTT66VPRMX5UZYSDGSVRXKKDDDU5	2023-11-07
https://www.debian.org/security/2020/dsa-4721	2023-11-07
https://access.redhat.com/security/cve/CVE-2020-10933	2022-02-21
https://bugzilla.redhat.com/show_bug.cgi?id=1833291	2022-02-21

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Ruby-lang Search vendor "Ruby-lang"	Ruby Search vendor "Ruby-lang" for product "Ruby"	>= 2.5.0 <= 2.5.7 Search vendor "Ruby-lang" for product "Ruby" and version " >= 2.5.0 <= 2.5.7"	-	Affected	in	Linux Search vendor "Linux"	Linux Kernel Search vendor "Linux" for product "Linux Kernel"	-	-	Safe
Ruby-lang Search vendor "Ruby-lang"	Ruby Search vendor "Ruby-lang" for product "Ruby"	>= 2.6.0 <= 2.6.5 Search vendor "Ruby-lang" for product "Ruby" and version " >= 2.6.0 <= 2.6.5"	-	Affected	in	Linux Search vendor "Linux"	Linux Kernel Search vendor "Linux" for product "Linux Kernel"	-	-	Safe
Ruby-lang Search vendor "Ruby-lang"	Ruby Search vendor "Ruby-lang" for product "Ruby"	2.7.0 Search vendor "Ruby-lang" for product "Ruby" and version "2.7.0"	-	Affected	in	Linux Search vendor "Linux"	Linux Kernel Search vendor "Linux" for product "Linux Kernel"	-	-	Safe
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				31 Search vendor "Fedoraproject" for product "Fedora" and version "31"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected