Terrapin attack in Aruba AOS-CX switches

1) Inadequate encryption strength

EUVDB-ID: #VU84537

Risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-48795

CWE-ID: CWE-326 - Inadequate Encryption Strength

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to incorrect implementation of the SSH Binary Packet Protocol (BPP), which mishandles the handshake phase and the use of sequence numbers. A remote attacker can perform MitM attack and delete the SSH2_MSG_EXT_INFO message sent before authentication starts, allowing the attacker to disable a subset of the keystroke timing obfuscation features introduced in OpenSSH 9.5.

The vulnerability was dubbed "Terrapin attack" and it affects both client and server implementations.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Aruba CX 4100i Switch Series: All versions

Aruba CX 6000 Switch Series: All versions

Aruba CX 6100 Switch Series: All versions

Aruba CX 6200 Switch Series: All versions

Aruba CX 6300 Switch Series: All versions

Aruba CX 6400 Switch Series: All versions

Aruba CX 8320 Switch Series: All versions

Aruba CX 8325 Switch Series: All versions

Aruba CX 8360 Switch Series: All versions

Aruba CX 8400 Switch Series: All versions

Aruba CX 9300 Switch Series: All versions

Aruba CX 10000 Switch Series: All versions

ArubaOS-CX (AOS-CX): before 10.13.1010

External links

http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2024-005.txt

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.