SUSE update for libssh

Published: 2024-01-18

Risk	High
Patch available	YES
Number of vulnerabilities	5
CVE-ID	CVE-2023-1667 CVE-2023-2283 CVE-2023-48795 CVE-2023-6004 CVE-2023-6918
CWE-ID	CWE-20 CWE-287 CWE-326 CWE-78 CWE-252
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	SUSE Linux Enterprise Server 15 SP4 LTSS Operating systems & Components / Operating system SUSE Linux Enterprise High Performance Computing LTSS 15 Operating systems & Components / Operating system SUSE Linux Enterprise High Performance Computing ESPOS 15 Operating systems & Components / Operating system SUSE Linux Enterprise Desktop 15 SP4 LTSS Operating systems & Components / Operating system SUSE Linux Enterprise Micro Operating systems & Components / Operating system openSUSE Leap Micro Operating systems & Components / Operating system Basesystem Module Operating systems & Components / Operating system SUSE Linux Enterprise Micro for Rancher Operating systems & Components / Operating system SUSE Linux Enterprise Server for SAP Applications 15 Operating systems & Components / Operating system SUSE Linux Enterprise Server 15 Operating systems & Components / Operating system SUSE Linux Enterprise Real Time 15 Operating systems & Components / Operating system SUSE Linux Enterprise High Performance Computing 15 Operating systems & Components / Operating system SUSE Linux Enterprise Desktop 15 Operating systems & Components / Operating system openSUSE Leap Operating systems & Components / Operating system SUSE Manager Retail Branch Server Operating systems & Components / Operating system SUSE Manager Server Operating systems & Components / Operating system SUSE Manager Proxy Operating systems & Components / Operating system libssh4-64bit Operating systems & Components / Operating system package or component libssh4-64bit-debuginfo Operating systems & Components / Operating system package or component libssh4-32bit Operating systems & Components / Operating system package or component libssh4-32bit-debuginfo Operating systems & Components / Operating system package or component libssh-debugsource Operating systems & Components / Operating system package or component libssh4-debuginfo Operating systems & Components / Operating system package or component libssh-devel Operating systems & Components / Operating system package or component libssh4 Operating systems & Components / Operating system package or component libssh-config Operating systems & Components / Operating system package or component
Vendor	SUSE

Security Bulletin

This security bulletin contains information about 5 vulnerabilities.

1) Input validation error

EUVDB-ID: #VU75741

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-1667

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to multiple errors in kex implementation, related to kex guessing algorithm. A remote attacker can bypass implemented security restrictions.

Mitigation

Update the affected package libssh to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server 15 SP4 LTSS: 15-SP4

SUSE Linux Enterprise High Performance Computing LTSS 15: SP4

SUSE Linux Enterprise High Performance Computing ESPOS 15: SP4

SUSE Linux Enterprise Desktop 15 SP4 LTSS: 15-SP4

SUSE Linux Enterprise Micro: 5.3 - 5.5

openSUSE Leap Micro: 5.3 - 5.4

Basesystem Module: 15-SP5

SUSE Linux Enterprise Micro for Rancher: 5.3 - 5.4

SUSE Linux Enterprise Server for SAP Applications 15: SP4 - SP5

SUSE Linux Enterprise Server 15: SP4 - SP5

SUSE Linux Enterprise Real Time 15: SP4 - SP5

SUSE Linux Enterprise High Performance Computing 15: SP4 - SP5

SUSE Linux Enterprise Desktop 15: SP5

openSUSE Leap: 15.4 - 15.5

SUSE Manager Retail Branch Server: 4.3

SUSE Manager Server: 4.3

SUSE Manager Proxy: 4.3

libssh4-64bit: before 0.9.8-150400.3.3.1

libssh4-64bit-debuginfo: before 0.9.8-150400.3.3.1

libssh4-32bit: before 0.9.8-150400.3.3.1

libssh4-32bit-debuginfo: before 0.9.8-150400.3.3.1

libssh-debugsource: before 0.9.8-150400.3.3.1

libssh4-debuginfo: before 0.9.8-150400.3.3.1

libssh-devel: before 0.9.8-150400.3.3.1

libssh4: before 0.9.8-150400.3.3.1

libssh-config: before 0.9.8-150400.3.3.1

External links

http://www.suse.com/support/update/announcement/2024/suse-su-20240140-1/

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.

2) Improper Authentication

EUVDB-ID: #VU75740

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-2283

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error within the pki_verify_data_signature() function in pki_crypto.c. The pki_key_check_hash_compatible() function can return SSH_OK value if memory allocation error happens later in the function. The A remote attacker can bypass authentication process and gain unauthorized access to the system.

Mitigation

Update the affected package libssh to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server 15 SP4 LTSS: 15-SP4

SUSE Linux Enterprise High Performance Computing LTSS 15: SP4

SUSE Linux Enterprise High Performance Computing ESPOS 15: SP4

SUSE Linux Enterprise Desktop 15 SP4 LTSS: 15-SP4

SUSE Linux Enterprise Micro: 5.3 - 5.5

openSUSE Leap Micro: 5.3 - 5.4

Basesystem Module: 15-SP5

SUSE Linux Enterprise Micro for Rancher: 5.3 - 5.4

SUSE Linux Enterprise Server for SAP Applications 15: SP4 - SP5

SUSE Linux Enterprise Server 15: SP4 - SP5

SUSE Linux Enterprise Real Time 15: SP4 - SP5

SUSE Linux Enterprise High Performance Computing 15: SP4 - SP5

SUSE Linux Enterprise Desktop 15: SP5

openSUSE Leap: 15.4 - 15.5

SUSE Manager Retail Branch Server: 4.3

SUSE Manager Server: 4.3

SUSE Manager Proxy: 4.3

libssh4-64bit: before 0.9.8-150400.3.3.1

libssh4-64bit-debuginfo: before 0.9.8-150400.3.3.1

libssh4-32bit: before 0.9.8-150400.3.3.1

libssh4-32bit-debuginfo: before 0.9.8-150400.3.3.1

libssh-debugsource: before 0.9.8-150400.3.3.1

libssh4-debuginfo: before 0.9.8-150400.3.3.1

libssh-devel: before 0.9.8-150400.3.3.1

libssh4: before 0.9.8-150400.3.3.1

libssh-config: before 0.9.8-150400.3.3.1

External links

http://www.suse.com/support/update/announcement/2024/suse-su-20240140-1/

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.

3) 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 libssh to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server 15 SP4 LTSS: 15-SP4

SUSE Linux Enterprise High Performance Computing LTSS 15: SP4

SUSE Linux Enterprise High Performance Computing ESPOS 15: SP4

SUSE Linux Enterprise Desktop 15 SP4 LTSS: 15-SP4

SUSE Linux Enterprise Micro: 5.3 - 5.5

openSUSE Leap Micro: 5.3 - 5.4

Basesystem Module: 15-SP5

SUSE Linux Enterprise Micro for Rancher: 5.3 - 5.4

SUSE Linux Enterprise Server for SAP Applications 15: SP4 - SP5

SUSE Linux Enterprise Server 15: SP4 - SP5

SUSE Linux Enterprise Real Time 15: SP4 - SP5

SUSE Linux Enterprise High Performance Computing 15: SP4 - SP5

SUSE Linux Enterprise Desktop 15: SP5

openSUSE Leap: 15.4 - 15.5

SUSE Manager Retail Branch Server: 4.3

SUSE Manager Server: 4.3

SUSE Manager Proxy: 4.3

libssh4-64bit: before 0.9.8-150400.3.3.1

libssh4-64bit-debuginfo: before 0.9.8-150400.3.3.1

libssh4-32bit: before 0.9.8-150400.3.3.1

libssh4-32bit-debuginfo: before 0.9.8-150400.3.3.1

libssh-debugsource: before 0.9.8-150400.3.3.1

libssh4-debuginfo: before 0.9.8-150400.3.3.1

libssh-devel: before 0.9.8-150400.3.3.1

libssh4: before 0.9.8-150400.3.3.1

libssh-config: before 0.9.8-150400.3.3.1

External links

http://www.suse.com/support/update/announcement/2024/suse-su-20240140-1/

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.

4) OS Command Injection

EUVDB-ID: #VU84538

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-6004

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation in OpenSSH client. If an invalid user or hostname that contained shell metacharacters was passed to ssh(1), and a ProxyCommand, LocalCommand directive or "match exec" predicate referenced the user or hostname via %u, %h or similar expansion token, then an attacker who could supply arbitrary user/hostnames to ssh(1) could potentially perform command injection depending on what quoting was present in the user-supplied ssh_config(5) directive.

Mitigation

Update the affected package libssh to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server 15 SP4 LTSS: 15-SP4

SUSE Linux Enterprise High Performance Computing LTSS 15: SP4

SUSE Linux Enterprise High Performance Computing ESPOS 15: SP4

SUSE Linux Enterprise Desktop 15 SP4 LTSS: 15-SP4

SUSE Linux Enterprise Micro: 5.3 - 5.5

openSUSE Leap Micro: 5.3 - 5.4

Basesystem Module: 15-SP5

SUSE Linux Enterprise Micro for Rancher: 5.3 - 5.4

SUSE Linux Enterprise Server for SAP Applications 15: SP4 - SP5

SUSE Linux Enterprise Server 15: SP4 - SP5

SUSE Linux Enterprise Real Time 15: SP4 - SP5

SUSE Linux Enterprise High Performance Computing 15: SP4 - SP5

SUSE Linux Enterprise Desktop 15: SP5

openSUSE Leap: 15.4 - 15.5

SUSE Manager Retail Branch Server: 4.3

SUSE Manager Server: 4.3

SUSE Manager Proxy: 4.3

libssh4-64bit: before 0.9.8-150400.3.3.1

libssh4-64bit-debuginfo: before 0.9.8-150400.3.3.1

libssh4-32bit: before 0.9.8-150400.3.3.1

libssh4-32bit-debuginfo: before 0.9.8-150400.3.3.1

libssh-debugsource: before 0.9.8-150400.3.3.1

libssh4-debuginfo: before 0.9.8-150400.3.3.1

libssh-devel: before 0.9.8-150400.3.3.1

libssh4: before 0.9.8-150400.3.3.1

libssh-config: before 0.9.8-150400.3.3.1

External links

http://www.suse.com/support/update/announcement/2024/suse-su-20240140-1/

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.

5) Unchecked Return Value

EUVDB-ID: #VU84540

Risk: Low

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

CVE-ID: CVE-2023-6918

CWE-ID: CWE-252 - Unchecked Return Value

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to libssh does not check for returned values of message digest (MD) operations in low memory conditions. A remote attacker can terminate the connection or force the library to use weak keys.

Mitigation

Update the affected package libssh to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server 15 SP4 LTSS: 15-SP4

SUSE Linux Enterprise High Performance Computing LTSS 15: SP4

SUSE Linux Enterprise High Performance Computing ESPOS 15: SP4

SUSE Linux Enterprise Desktop 15 SP4 LTSS: 15-SP4

SUSE Linux Enterprise Micro: 5.3 - 5.5

openSUSE Leap Micro: 5.3 - 5.4

Basesystem Module: 15-SP5

SUSE Linux Enterprise Micro for Rancher: 5.3 - 5.4

SUSE Linux Enterprise Server for SAP Applications 15: SP4 - SP5

SUSE Linux Enterprise Server 15: SP4 - SP5

SUSE Linux Enterprise Real Time 15: SP4 - SP5

SUSE Linux Enterprise High Performance Computing 15: SP4 - SP5

SUSE Linux Enterprise Desktop 15: SP5

openSUSE Leap: 15.4 - 15.5

SUSE Manager Retail Branch Server: 4.3

SUSE Manager Server: 4.3

SUSE Manager Proxy: 4.3

libssh4-64bit: before 0.9.8-150400.3.3.1

libssh4-64bit-debuginfo: before 0.9.8-150400.3.3.1

libssh4-32bit: before 0.9.8-150400.3.3.1

libssh4-32bit-debuginfo: before 0.9.8-150400.3.3.1

libssh-debugsource: before 0.9.8-150400.3.3.1

libssh4-debuginfo: before 0.9.8-150400.3.3.1

libssh-devel: before 0.9.8-150400.3.3.1

libssh4: before 0.9.8-150400.3.3.1

libssh-config: before 0.9.8-150400.3.3.1

External links

http://www.suse.com/support/update/announcement/2024/suse-su-20240140-1/

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.