This security bulletin contains one medium risk vulnerability.
1) Origin validation error
EUVDB-ID: #VU59319
Risk: Medium
CVSSv3.1:
CVE-ID: CVE-2021-3618
CWE-ID: CWE-346 - Origin Validation Error
Exploit availability: No
Description
The 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).
Mitigation
Update the affected package nginx to the latest version.
Vulnerable software versions
SUSE Linux Enterprise Server for SAP: 15-SP1
SUSE Linux Enterprise High Performance Computing: 15-SP1-ESPOS - 15-SP1-LTSS
SUSE Enterprise Storage: 6
SUSE CaaS Platform: 4.0
SUSE Linux Enterprise Server: 15-SP1-BCL - 15-SP1-LTSS
nginx-source: before 1.16.1-150100.6.16.1
nginx-debugsource: before 1.16.1-150100.6.16.1
nginx-debuginfo: before 1.16.1-150100.6.16.1
nginx: before 1.16.1-150100.6.16.1
CPE2.3
External links
http://www.suse.com/support/update/announcement/2022/suse-su-20224266-1/
Q & A
Can this vulnerability be exploited remotely?
Is there known malware, which exploits ..
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