Security Bulletin
This security bulletin contains one medium risk vulnerability.
EUVDB-ID: #VU50843
Risk: Medium
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-20230
CWE-ID:
CWE-295 - Improper Certificate Validation
Exploit availability: No
DescriptionThe 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.
Update the affected package stunnel to the latest version.
Vulnerable software versionsSUSE Manager Proxy: 4.0
SUSE Manager Retail Branch Server: 4.0
SUSE Manager Server: 4.0
SUSE Linux Enterprise Server for SAP: 15 - 15-SP1
SUSE Linux Enterprise High Performance Computing: 15-ESPOS - 15-SP1-LTSS
SUSE Enterprise Storage: 6
SUSE CaaS Platform: 4.0
SUSE Linux Enterprise Server: 15-LTSS - 15-SP1-LTSS
stunnel-debugsource: before 5.44-3.8.1
stunnel-debuginfo: before 5.44-3.8.1
stunnel: before 5.44-3.8.1
External linkshttp://www.suse.com/support/update/announcement/2021/suse-su-20211465-1/
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.