Errors testing new connector to CHv 8 – “Connection Error: A failure occurred connecting to Citrix Hypervisor. Error = write EPROTO 140247625111360:error:1407742E:SSL routines:SSL23_GET_SERVER_HELLO:tlsv1 alert protocol”

In the XenCenter configuration for the host, uncheck the option to force only TLS 1.2 communication. See the section, “disabling older protocols”, in the below doc.

https://www.citrix.com/content/dam/citrix/en_us/documents/white-paper/security-recommendations-when-deploying-citrix-xenserver.pdf


To correct the cert errors, when unchecking the connector setting, “ignore certificate errors”, follow the below article.

https://support.citrix.com/article/CTX261855

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Cisco Adaptive Security Appliance Software SSL VPN Denial of Service Vulnerability

A vulnerability in the Secure Sockets Layer (SSL) VPN feature of Cisco Adaptive Security Appliance (ASA) Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition that prevents the creation of new SSL/Transport Layer Security (TLS) connections to an affected device.

The vulnerability is due to incorrect handling of Base64-encoded strings. An attacker could exploit this vulnerability by opening many SSL VPN sessions to an affected device. The attacker would need to have valid user credentials on the affected device to exploit this vulnerability. A successful exploit could allow the attacker to overwrite a special system memory location, which will eventually result in memory allocation errors for new SSL/TLS sessions to the device, preventing successful establishment of these sessions. A reload of the device is required to recover from this condition. Established SSL/TLS connections to the device and SSL/TLS connections through the device are not affected.

Note: Although this vulnerability is in the SSL VPN feature, successful exploitation of this vulnerability would affect all new SSL/TLS sessions to the device, including management sessions.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191002-asa-ssl-vpn-dos

This advisory is part of the October 2019 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication, which includes 10 Cisco Security Advisories that describe 18 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: October 2019 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication.

Security Impact Rating: High

CVE: CVE-2019-12677

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Cisco IOS and IOS XE Software HTTP Client Information Disclosure Vulnerability

A vulnerability in the HTTP client feature of Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker to read and modify data that should normally have been sent via an encrypted channel.

The vulnerability is due to TCP port information not being considered when matching new requests to existing, persistent HTTP connections. An attacker could exploit this vulnerability by acting as a man-in-the-middle and then reading and/or modifying data that should normally have been sent through an encrypted channel.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190925-http-client

Security Impact Rating: Medium

CVE: CVE-2019-12665

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How can I disallow TLS 1.1 for the session between the user’s device and the Proxy SG?

I need a solution

Hi;

My understandins is that the TLS version setting under Configuraiton> SSL> SSL client are for the ssl session between the Proxy SG and the Server, so you can disallow TLS 1.1 between the Proxy SG and the OCS “Server”.

My question is:

How can I disallow TLS 1.1 for the session between the user’s device and the Proxy SG?

Kindly

Wasfi

0

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What’s the traffic flow in case of an inline IPS and an inline Proxy SG?

I need a solution

Hi;

If I had an IPS device connected inline with the SSL V, and next inline of the SSL V is a Proxy SG.

Does the SSL “https” stream that arrives from the Internet, does it get decrypted by the SSLV to be sent to the IPS, which in case a clean traffic, returns it to the SSLV to be encrypted again and then re-decrypted to be sent to the Proxy SG, which in turn if the traffic is allowed, sends it back to the SSLV to be encrypted again and sent to the internal “LAN”?

Kindly

Wasfi

0

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Cisco Integrated Management Controller Supervisor, Cisco UCS Director, and Cisco UCS Director Express for Big Data Authentication Bypass Vulnerability

A vulnerability in the web-based management interface of Cisco Integrated Management Controller (IMC) Supervisor, Cisco UCS Director, and Cisco UCS Director Express for Big Data could allow an unauthenticated, remote attacker to acquire a valid session token with administrator privileges, bypassing user authentication.

The vulnerability is due to insufficient request header validation during the authentication process. An attacker could exploit this vulnerability by sending a series of malicious requests to an affected device. An exploit could allow the attacker to use the acquired session token to gain full administrator access to the affected device.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190821-imcs-ucs-authby

Security Impact Rating: Critical

CVE: CVE-2019-1937

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Cisco Webex Meetings Mobile (iOS) SSL Certificate Validation Vulnerability

A vulnerability in Cisco Webex Meetings Mobile (iOS) could allow an unauthenticated, remote attacker to gain unauthorized read access to sensitive data by using an invalid Secure Sockets Layer (SSL) certificate.

The vulnerability is due to insufficient SSL certificate validation by the affected software. An attacker could exploit this vulnerability by supplying a crafted SSL certificate to an affected device. A successful exploit could allow the attacker to conduct man-in-the-middle attacks to decrypt confidential information on user connections to the affected software.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190821-webex-ssl-cert

Security Impact Rating: Medium

CVE: CVE-2019-1948

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Key Negotiation of Bluetooth Vulnerability

A weakness in the Bluetooth Basic Rate/Enhanced Data Rate (BR/EDR) protocol core specification exposes a vulnerability that could allow for an unauthenticated, adjacent attacker to perform a man-in-the-middle attack on an encrypted Bluetooth connection. The attack must be performed during negotiation or renegotiation of a paired device connection; existing sessions cannot be attacked.

The issue could allow the attacker to reduce the entropy of the negotiated session key that is used to secure a Bluetooth connection between a paired device and a host device. An attacker who can successfully inject a malicious message into a Bluetooth connection during session negotiation or renegotiation could cause the strength of the session key to be susceptible to brute force attack.

This advisory will be updated as additional information becomes available. There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190813-bluetooth

Security Impact Rating: Medium

CVE: CVE-2019-9506

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