CVE-2020-29652

golang: crypto/ssh: crafted authentication request can lead to nil pointer dereference

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A nil pointer dereference in the golang.org/x/crypto/ssh component through v0.0.0-20201203163018-be400aefbc4c for Go allows remote attackers to cause a denial of service against SSH servers.

Una desreferencia de puntero null en el componente golang.org/x/crypto/ssh versiones hasta v0.0.0-20201203163018-be400aefbc4c para Go, permite a atacantes remotos causar una denegación de servicio contra servidores SSH

A null pointer dereference vulnerability was found in golang. When using the library's ssh server without specifying an option for GSSAPIWithMICConfig, it is possible for an attacker to craft an ssh client connection using the `gssapi-with-mic` authentication method and cause the server to panic resulting in a denial of service. The highest threat from this vulnerability is to system availability.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-12-09 CVE Reserved
2020-12-17 CVE Published
2023-11-08 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-476: NULL Pointer Dereference

CAPEC

References (5)

URL	Tag	Source
https://go-review.googlesource.com/c/crypto/+/278852	Third Party Advisory
https://groups.google.com/g/golang-announce/c/ouZIlBimOsE?pli=1	Third Party Advisory
https://lists.apache.org/thread.html/r68032132c0399c29d6cdc7bd44918535da54060a10a12b1591328bff%40%3Cnotifications.skywalking.apache.org%3E	Mailing List

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2020-29652	2021-07-28
https://bugzilla.redhat.com/show_bug.cgi?id=1908883	2021-07-28

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Golang Search vendor "Golang"		Ssh Search vendor "Golang" for product "Ssh"				<= 0.0.0-20201203163018-be400aefbc4c Search vendor "Golang" for product "Ssh" and version " <= 0.0.0-20201203163018-be400aefbc4c"		-		Affected