SUSE update for libnettle

1) Use of a broken or risky cryptographic algorithm

EUVDB-ID: #VU52195

Risk: High

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-20305

CWE-ID: CWE-327 - Use of a Broken or Risky Cryptographic Algorithm

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

A flaw was found in Nettle in versions before 3.7.2, where several Nettle signature verification functions (GOST DSA, EDDSA & ECDSA) result in the Elliptic Curve Cryptography point (ECC) multiply function being called with out-of-range scalers, possibly resulting in incorrect results. This flaw allows an attacker to force an invalid signature, causing an assertion failure or possible validation. The highest threat to this vulnerability is to confidentiality, integrity, as well as system availability.

Mitigation

Update the affected package libnettle to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server for SAP: 15-SP1 - 15-SP3

SUSE Manager Proxy: 4.0

SUSE Manager Retail Branch Server: 4.0

SUSE Manager Server: 4.0

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

SUSE Enterprise Storage: 6

SUSE CaaS Platform: 4.0

SUSE MicroOS: 5.0

SUSE Linux Enterprise Server: 15-LTSS - 15-SP1-LTSS

SUSE Linux Enterprise Module for Basesystem: 15-SP2 - 15-SP3

libnettle6-32bit-debuginfo: before 3.4.1-4.15.1

libnettle6-32bit: before 3.4.1-4.15.1

libhogweed4-32bit-debuginfo: before 3.4.1-4.15.1

libhogweed4-32bit: before 3.4.1-4.15.1

libnettle-devel: before 3.4.1-4.15.1

libnettle6-debuginfo: before 3.4.1-4.15.1

libnettle6: before 3.4.1-4.15.1

libnettle-debugsource: before 3.4.1-4.15.1

libhogweed4-debuginfo: before 3.4.1-4.15.1

libhogweed4: before 3.4.1-4.15.1

CPE2.3

• cpe:2.3:o:suse:suse_linux_enterprise_server_for_sap:15-SP1:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server_for_sap:15-SP3:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_manager_proxy:4.0:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_manager_retail_branch_server:4.0:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_manager_server:4.0:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_high_performance_computing:15-LTSS:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_high_performance_computing:15-ESPOS:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_high_performance_computing:15-SP1-LTSS:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_enterprise_storage:6:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_caas_platform:4.0:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_microos:5.0:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server:15-LTSS:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_module_for_basesystem:15-SP2:*:*:*:*:*:*:*
• cpe:2.3:a:suse:libnettle6-32bit-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libnettle6-32bit:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libhogweed4-32bit-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libhogweed4-32bit:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libnettle-devel:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libnettle6-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libnettle6:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libnettle-debugsource:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libhogweed4-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libhogweed4:*:*:*:*:*:suse_linux:*:*

External links

https://www.suse.com/support/update/announcement/2021/suse-su-20211412-1/

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.