The following platforms ship with Intel Coleto chips: - MPX 5900 - MPX/SDX 8900 - MPX/SDX 26000 - MPX/SDX 26000-50S - MPS/SDX 26000-100G - MPX/SDX 15000-50G You can use the “show hardware’ command to identify whether your appliance has Coleto (COL) or N3 chips. ADC platforms that support EMS: - MPX and SDX platforms containing either Cavium N3 chips or Intel Coleto Creek crypto cards. For more information about EMS, see RFC 7627. If the peer does not support EMS, then the EMS calculation is not used for the connection even though the parameter is enabled on the appliance. If the parameter is enabled and the peer supports EMS, the ADC appliance uses the EMS calculation. To support EMS on the Citrix ADC appliance, a parameter "allowExtendedMasterSecret" is added that applies to both frontend and backend SSL profiles. Title: Support for Extended Master Secret in SSL handshake on Citrix ADC platforms Extended Master Secret (EMS) is an optional extension to the Transport Layer Security (TLS) protocol. To avoid these delays, support is added to check expiry of DNS records before serving from the cache. These actions add a delay in launching the application. If retry is built into the application, then the application can try the other IP addresses in the DNS record. If the IP address is not reachable, the application might fail to launch if retry is not built into the application. Once the IP addresses are decommissioned, the IP addresses can be either made invalid or assigned to other resources in the environment. In this scenario, if a user attempts to resolve the application domain through teh cache, the decommissioned IP addresses are served. If the DNS record TTL is configured in seconds, the DNS record might not be cleared from the Citrix ADC appliance cache as soon as its TTL expires.
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During scale down, when the application containers are brought down, orchestration platforms update the DNS by removing the decommissioned container's IP addresses. Title: Proactively checking expiry of DNS records before serving from the cache Support is now added to check expiry of DNS records before serving from the cache. If an attacker tries to mix and match an application cookie or a session cookie stolen from the victim, the cookie consistency validation fails and the appliance applies the corresponding cookie hijacking action.
For every new client request, the appliance validates the TLS connection and checks the consistency of application and session cookies in the request. To mitigate a cookie hijacking attack, the Citrix ADC Web App Firewall challenges the TLS connection from the client and also performs cookie consistency validation. The attacker then uses the cookies to gain access to the user's web application sessions. The attacker can steal these cookies either manually from the cookie store of the browser or through some rouge browser extension. During the session, the browser saves these cookies in a cookie file. The web application will allocate session cookies for this session, and sends this session cookies along with other user attribute cookies in the response. When a user browses a website, for example banking application, the website establishes a session with the browser. Title: Cookie hijack protection Cookie hijacking is a security attack, where a user session is hijacked by an attacker to gain unauthorized access to a web application. The Citrix ADM built-in agent available on Citrix ADC SDX instances starts like an active daemon and communicates with ADM service. From Citrix ADC release 13.0 build 61.xx and higher, Citrix ADC SDX instances have built-in agent with ADM Service Connect functionality.
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From Citrix ADC release 13.0 build 61.xx and higher, the Citrix ADM built-in agent available on Citrix ADC instances communicates with ADM service without the need for manual initialization on the respective ADC instance.For Citrix ADC MPX and VPX instances, and Citrix Gateway appliance, the Citrix ADM service connect feature has been introduced as part of release 13.0 build 61.xx.For a list of security related fixes and advisories, see the Citrix security bulletin. This release notes document does not include security related fixes.
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