SUSE update for openssh



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 		SUSE Linux Enterprise Server for SAP Applications 12
Operating systems & Components / Operating system

SUSE Linux Enterprise Server 12
Operating systems & Components / Operating system

SUSE Linux Enterprise High Performance Computing 12
Operating systems & Components / Operating system

openssh-helpers
Operating systems & Components / Operating system package or component

openssh-helpers-debuginfo
Operating systems & Components / Operating system package or component

openssh
Operating systems & Components / Operating system package or component

openssh-debuginfo
Operating systems & Components / Operating system package or component

openssh-askpass-gnome-debuginfo
Operating systems & Components / Operating system package or component

openssh-askpass-gnome
Operating systems & Components / Operating system package or component

openssh-fips
Operating systems & Components / Operating system package or component

openssh-debugsource
Operating systems & Components / Operating system package or component

Vendor SUSE

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

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

Update the affected package openssh to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server for SAP Applications 12: SP5

SUSE Linux Enterprise Server 12: SP5

SUSE Linux Enterprise High Performance Computing 12: SP5

openssh-helpers: before 7.2p2-81.8.1

openssh-helpers-debuginfo: before 7.2p2-81.8.1

openssh: before 7.2p2-81.8.1

openssh-debuginfo: before 7.2p2-81.8.1

openssh-askpass-gnome-debuginfo: before 7.2p2-81.8.1

openssh-askpass-gnome: before 7.2p2-81.8.1

openssh-fips: before 7.2p2-81.8.1

openssh-debugsource: before 7.2p2-81.8.1

CPE2.3 External links

http://www.suse.com/support/update/announcement/2023/suse-su-20234903-1/


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.



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