Terrapin SSH attack in Junos OS and Junos OS Evolved
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2023-48795 |
| CWE-ID | CWE-326 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Juniper Junos OS Operating systems & Components / Operating system Junos OS Evolved Operating systems & Components / Operating system |
| Vendor | Juniper Networks, Inc. |
Security Bulletin
This security bulletin contains one low risk vulnerability.
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
DescriptionThe 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.
Install update from vendor's website.
Vulnerable software versionsJuniper Junos OS: 19.4R1 - 23.2R1-S2
Junos OS Evolved: 19.4R2-S2-EVO - 23.2R1-S2-EVO
CPE2.3- cpe:2.3:o:juniper_networks:juniper_junos_os:23.2R1-S2:*:*:*:*:*:*:
- cpe:2.3:o:juniper_networks:juniper_junos_os:20.4R3-S9:*:*:*:*:*:*:
- cpe:2.3:o:juniper_networks:juniper_junos_os:22.4R2-S2:*:*:*:*:*:*:
- cpe:2.3:o:juniper_networks:juniper_junos_os:23.2R1-S1:*:*:*:*:*:*:
- cpe:2.3:o:juniper_networks:juniper_junos_os:21.4R3-S5:*:*:*:*:*:*:
- cpe:2.3:o:juniper_networks:juniper_junos_os:22.2R3-S2:*:*:*:*:*:*:
- cpe:2.3:o:juniper_networks:juniper_junos_os:22.1R3-S4:*:*:*:*:*:*:
- cpe:2.3:o:juniper_networks:juniper_junos_os:19.4R3-S12:*:*:*:*:*:*:
- cpe:2.3:o:juniper_networks:juniper_junos_os:19.4R1-S4:*:*:*:*:*:*:
- cpe:2.3:o:juniper_networks:junos_os_evolved:23.2R1-S2-EVO:*:*:*:*:*:*:
- cpe:2.3:o:juniper_networks:junos_os_evolved:20.4R3-S9-EVO:*:*:*:*:*:*:
- cpe:2.3:o:juniper_networks:junos_os_evolved:19.4R3-EVO:*:*:*:*:*:*:
- cpe:2.3:o:juniper_networks:junos_os_evolved:21.4R3-S5-EVO:*:*:*:*:*:*:
- cpe:2.3:o:juniper_networks:junos_os_evolved:22.4R2-S2-EVO:*:*:*:*:*:*:
- cpe:2.3:o:juniper_networks:junos_os_evolved:23.2R1-S1-EVO:*:*:*:*:*:*:
- cpe:2.3:o:juniper_networks:junos_os_evolved:22.4R3-EVO:*:*:*:*:*:*:
- cpe:2.3:o:juniper_networks:junos_os_evolved:22.2R3-S2-EVO:*:*:*:*:*:*:
- cpe:2.3:o:juniper_networks:junos_os_evolved:22.1R3-S4-EVO:*:*:*:*:*:*:
- cpe:2.3:o:juniper_networks:junos_os_evolved:20.4R3-S8-EVO:*:*:*:*:*:*:
- cpe:2.3:o:juniper_networks:junos_os_evolved:20.4R2-S2-EVO:*:*:*:*:*:*:
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
