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x/crypto/ssh vulnerable to panic via malformed packets

High severity GitHub Reviewed Published Sep 7, 2022 to the GitHub Advisory Database • Updated Aug 30, 2023

Package

gomod golang.org/x/crypto (Go)

Affected versions

< 0.0.0-20211202192323-5770296d904e

Patched versions

0.0.0-20211202192323-5770296d904e

Description

The x/crypto/ssh package before 0.0.0-20211202192323-5770296d904e of golang.org/x/crypto allows an unauthenticated attacker to panic an SSH server. When using AES-GCM or ChaCha20Poly1305, consuming a malformed packet which contains an empty plaintext causes a panic.

References

Published by the National Vulnerability Database Sep 6, 2022
Published to the GitHub Advisory Database Sep 7, 2022
Reviewed Sep 16, 2022
Last updated Aug 30, 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

0.081%
(37th percentile)

Weaknesses

No CWEs

CVE ID

CVE-2021-43565

GHSA ID

GHSA-gwc9-m7rh-j2ww

Source code

No known source code
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