Security Bulletin
This security bulletin contains one medium risk vulnerability.
EUVDB-ID: #VU59319
Risk: Medium
CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-3618
CWE-ID:
CWE-346 - Origin Validation Error
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to a logic error in TLS implementation when handling different protocols but using compatible certificates, such as multi-domain or wildcard certificates. A remote attacker with ability to perform TCP/IP layer MitM attack can redirect traffic from one subdomain to another, resulting in a valid TLS session. This breaks the authentication of TLS and cross-protocol attacks may be possible where the behavior of one protocol service may compromise the other at the application layer.
This attack technique was dubbed ALPACA (application layer protocol content confusion
attack).
Update the affected package nginx to the latest version.
Vulnerable software versionsSUSE Enterprise Storage: 7.1
SUSE Manager Retail Branch Server: 4.2
openSUSE Leap: 15.3 - 15.4
SUSE Manager Server: 4.2
SUSE Manager Proxy: 4.2
SUSE Linux Enterprise Server for SAP Applications: 15-SP3
SUSE Linux Enterprise Server: 15-SP3
SUSE Linux Enterprise High Performance Computing: 15-SP3
SUSE Linux Enterprise Module for Server Applications: 15-SP3
nginx-source: before 1.19.8-150300.3.9.1
nginx-debugsource: before 1.19.8-150300.3.9.1
nginx-debuginfo: before 1.19.8-150300.3.9.1
nginx: before 1.19.8-150300.3.9.1
vim-plugin-nginx: before 1.19.8-150300.3.9.1
External linkshttp://www.suse.com/support/update/announcement/2022/suse-su-20224201-1/
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.