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golang.org/x/crypto/ssh NULL Pointer Dereference vulnerability

High severity GitHub Reviewed Published May 24, 2022 to the GitHub Advisory Database • Updated Oct 2, 2023

Package

gomod golang.org/x/crypto (Go)

Affected versions

< 0.0.0-20201216223049-8b5274cf687f

Patched versions

0.0.0-20201216223049-8b5274cf687f

Description

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. An attacker can craft an authentication request message for the gssapi-with-mic method which will cause NewServerConn to panic via a nil pointer dereference if ServerConfig.GSSAPIWithMICConfig is nil.

References

Published by the National Vulnerability Database Dec 17, 2020
Published to the GitHub Advisory Database May 24, 2022
Reviewed Feb 8, 2023
Last updated Oct 2, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS score

0.568%
(78th percentile)

Weaknesses

CVE ID

CVE-2020-29652

GHSA ID

GHSA-3vm4-22fp-5rfm

Source code

No known source code
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