Bug 2344005 (CVE-2025-23419)

Summary: CVE-2025-23419 nginx: TLS Session Resumption Vulnerability
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: brking, caswilli, davidn, haoli, hkataria, jajackso, jcammara, jmitchel, jneedle, kaycoth, kegrant, koliveir, kshier, mabashia, pbraun, shvarugh, simaishi, smcdonal, stcannon, teagle, tfister, thavo, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in nginx. When name-based virtual hosts are configured to share the same IP address and port combination with TLS 1.3 and OpenSSL, a previously authenticated attacker can use session resumption to bypass client certificate authentication requirements on these servers. This vulnerability arises when TLS session tickets are used, the SSL session cache is used in the default virtual server, and the default virtual server performs client certificate authentication.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2344197, 2344198    
Bug Blocks:    

Description OSIDB Bzimport 2025-02-05 18:01:21 UTC 
When multiple server blocks are configured to share the same IP address and port, an attacker can use session resumption to bypass client certificate authentication requirements on these servers. This vulnerability arises when  TLS Session Tickets https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_ticket_key  are used and/or the  SSL session cache https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_cache  are used in the default server and the default server is performing client certificate authentication.  

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Comment 2 errata-xmlrpc 2025-05-13 10:37:22 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:7331 https://access.redhat.com/errata/RHSA-2025:7331