SUSE update for stunnel

1) Improper Certificate Validation

EUVDB-ID: #VU50843

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-20230

CWE-ID: CWE-295 - Improper Certificate Validation

Exploit availability: No

Description

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

The vulnerability exists due to improper client certificate validation, when redirect and verifyChain options are used. A remote attacker can bypass implemented security restrictions with a any valid certificated and gain access to sensitive information.

Mitigation

Update the affected package stunnel to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Module for Server Applications: 15-SP2

stunnel-debugsource: before 5.57-3.11.1

stunnel-debuginfo: before 5.57-3.11.1

stunnel: before 5.57-3.11.1

CPE2.3

• cpe:2.3:o:suse:suse_linux_enterprise_module_for_server_applications:15-SP2:*:*:*:*:*:*:*
• cpe:2.3:o:suse:stunnel-debugsource:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:o:suse:stunnel-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:o:suse:stunnel:*:*:*:*:*:suse_linux:*:*

External links

https://www.suse.com/support/update/announcement/2021/suse-su-20210772-1/

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.