CVE-2023-46445

Terrapin SSH Connection Weakening

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 in AsyncSSH before 2.14.1 allows attackers to control the extension info message (RFC 8308) via a man-in-the-middle attack, aka a "Rogue Extension Negotiation."

Un problema en AsyncSSH v2.14.0 y versiones anteriores permite a los atacantes controlar el mensaje de información de la extensión (RFC 8308) mediante un ataque de intermediario.

Fabian BÃ¤umer, Marcus Brinkmann, and Joerg Schwenk discovered that AsyncSSH did not properly handle the extension info message. An attacker able to intercept communications could possibly use this issue to downgrade the algorithm used for client authentication. Fabian BÃ¤umer, Marcus Brinkmann, and Joerg Schwenk discovered that AsyncSSH did not properly handle the user authentication request message. An attacker could possibly use this issue to control the remote end of an SSH client session via packet injection/removal and shell emulation.

*Credits: N/A

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

High

Authentication

None

Confidentiality

None

Integrity

Complete

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2023-10-23 CVE Reserved
2023-11-14 CVE Published
2023-12-20 First Exploit
2024-08-02 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-345: Insufficient Verification of Data Authenticity

CAPEC

References (8)

URL	Tag	Source
http://packetstormsecurity.com/files/176280/Terrapin-SSH-Connection-Weakening.html
https://github.com/advisories/GHSA-cfc2-wr2v-gxm5
https://github.com/ronf/asyncssh/blob/develop/docs/changes.rst
https://github.com/ronf/asyncssh/security/advisories/GHSA-cfc2-wr2v-gxm5	Third Party Advisory
https://security.netapp.com/advisory/ntap-20231222-0001
https://www.terrapin-attack.com

URL	Date	SRC
https://packetstorm.news/files/id/176280	2023-12-20

URL	Date	SRC

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ME34ROZWMDK5KLMZKTSA422XVJZ7IMTE	2023-12-22

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Asyncssh Project Search vendor "Asyncssh Project"		Asyncssh Search vendor "Asyncssh Project" for product "Asyncssh"				< 2.14.1 Search vendor "Asyncssh Project" for product "Asyncssh" and version " < 2.14.1"		-		Affected