SUSE update for openssh

1) Inadequate encryption strength

EUVDB-ID: #VU84537

Risk: Low

CVSSv4.0: 2.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2023-48795

CWE-ID: CWE-326 - Inadequate Encryption Strength

Exploit availability: Yes

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 15: SP1

SUSE Linux Enterprise Server 15 SP1 LTSS: 15-SP1

SUSE Linux Enterprise Server 15: SP1

SUSE Linux Enterprise High Performance Computing 15 SP1 LTSS: 15-SP1

SUSE Linux Enterprise High Performance Computing 15: SP1

SUSE CaaS Platform: 4.0

openssh-helpers-debuginfo: before 7.9p1-150100.6.34.1

openssh-askpass-gnome-debuginfo: before 7.9p1-150100.6.34.1

openssh-helpers: before 7.9p1-150100.6.34.1

openssh: before 7.9p1-150100.6.34.1

openssh-debuginfo: before 7.9p1-150100.6.34.1

openssh-fips: before 7.9p1-150100.6.34.1

openssh-askpass-gnome-debugsource: before 7.9p1-150100.6.34.1

openssh-askpass-gnome: before 7.9p1-150100.6.34.1

openssh-debugsource: before 7.9p1-150100.6.34.1

CPE2.3

• cpe:2.3:o:suse:suse_linux_enterprise_server_for_sap_applications_15:SP1:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server_15_sp1_ltss:15-SP1:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server_15:SP1:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_high_performance_computing_15_sp1_ltss:15-SP1:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_high_performance_computing_15:SP1:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_caas_platform:4.0:*:*:*:*:*:*:*
• cpe:2.3:o:suse:openssh-helpers-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:o:suse:openssh-askpass-gnome-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:o:suse:openssh-helpers:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:o:suse:openssh:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:o:suse:openssh-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:o:suse:openssh-fips:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:o:suse:openssh-askpass-gnome-debugsource:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:o:suse:openssh-askpass-gnome:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:o:suse:openssh-debugsource:*:*:*:*:*:suse_linux:*:*

External links

https://www.suse.com/support/update/announcement/2023/suse-su-20234905-1/

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. However, proof of concept for this vulnerability is available.