A vulnerability in the TLS handler of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software for Cisco Firepower 1000 Series firewalls could allow an unauthenticated, remote attacker to gain access to sensitive information. The vulnerability is due to improper implementation of countermeasures against the Bleichenbacher attack for cipher suites that rely on RSA for key exchange. An attacker could exploit this vulnerability by sending crafted TLS messages to the device, which would act as an oracle and allow the attacker to carry out a chosen-ciphertext attack. A successful exploit could allow the attacker to perform cryptanalytic operations that may allow decryption of previously captured TLS sessions to the affected device. To exploit this vulnerability, an attacker must be able to perform both of the following actions: Capture TLS traffic that is in transit between clients and the affected device Actively establish a considerable number of TLS connections to the affected device

A vulnerability in the TLS handler of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software for Cisco Firepower 1000 Series firewalls could allow an unauthenticated, remote attacker to gain access to sensitive information. The vulnerability is due to improper implementation of countermeasures against the Bleichenbacher attack for cipher suites that rely on RSA for key exchange. An attacker could exploit this vulnerability by sending crafted TLS messages to the device, which would act as an oracle and allow the attacker to carry out a chosen- ciphertext attack. A successful exploit could allow the attacker to perform cryptanalytic operations that may allow decryption of previously captured TLS sessions to the affected device. To exploit this vulnerability, an attacker must be able to perform both of the following actions: Capture TLS traffic that is in transit between clients and the affected device Actively establish a considerable number of TLS connections to the affected device

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According to its self-reported version, the TLS handler of Cisco Firepower Threat Defense (FTD) Software for Cisco Firepower 1000 Series firewalls is affected by the Bleichenbacher attack vulnerability due to improper implementation of countermeasures against the Bleichenbacher attack for cipher suites that rely on RSA for key exchange. An unauthenticated, remote attacker can exploit this by sending crafted TLS messages to the device, which would act as an oracle and allow the attacker to carry out a chosen-ciphertext attack. A successful exploit could allow the attacker to perform cryptanalytic operations that may allow decryption of previously captured TLS sessions to the affected device. To exploit this vulnerability, an attacker must be able to capture TLS traffic that is in transit between clients and the affected device, and actively establish a considerable number of TLS connections to the affected device.

Please see the included Cisco BID and Cisco Security Advisory for more information.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version   number.

According to its self-reported version, the TLS handler of Cisco Adaptive Security Appliance (ASA) Software for Cisco Firepower 1000 is affected by the Bleichenbacher attack vulnerability due to improper implementation of countermeasures against the Bleichenbacher attack for cipher suites that rely on RSA for key exchange. An unauthenticated, remote attacker can exploit this by sending crafted TLS messages to the device, which would act as an oracle and allow the attacker to carry out a chosen-ciphertext attack. A successful exploit could allow the attacker to perform cryptanalytic operations that may allow decryption of previously captured TLS sessions to the affected device. To exploit this vulnerability, an attacker must be able to capture TLS traffic that is in transit between clients and the affected device, and actively establish a considerable number of TLS connections to the affected device.

Please see the included Cisco BID and Cisco Security Advisory for more information.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version   number.

ID	Name	Product	Family	Type	Severity
506133	Cisco ASA/FTD Observable Discrepancy (CVE-2020-3585)	Tenable OT Security	Tenable.ot	Remote	low
149471	Cisco Firepower Threat Defense 1000 Series Bleichenbacher Attack (cisco-sa-asaftd-tls-bb-2g9uWkP)	Nessus	CISCO	Local	low
149470	Cisco Adaptive Security Appliance Software Bleichenbacher Attack (cisco-sa-asaftd-tls-bb-2g9uWkP)	Nessus	CISCO	Local	low

Detections

Analytics

CVE-2020-3585

low

Tenable Plugins

low

low

low