CVE-2020-3585: Cisco Firepower 1000 Series Bleichenbacher Attack Vulnerability
First published: Wed Oct 21 2020(Updated: )
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
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Firepower Threat Defense | <6.4.0.10 | |
| Cisco Firepower Threat Defense | >=6.5.0<6.5.0.5 | |
| Cisco Firepower Threat Defense | >=6.6.0<6.6.1 | |
| Cisco Firepower 1000 | ||
| Cisco Firepower 1010 | ||
| Cisco Firepower 1120 | ||
| Cisco Firepower 1140 | ||
| Cisco Firepower 1150 | ||
| Cisco Adaptive Security Appliance Software | <9.13.1.13 | |
| Cisco Adaptive Security Appliance Software | >=9.14<9.14.1.30 |
Remedy
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-tls-bb-2g9uWkP
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Reference Links
Frequently Asked Questions
What is CVE-2020-3585?
CVE-2020-3585 refers to a vulnerability in the TLS handler of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software.
How does CVE-2020-3585 impact Cisco Firepower 1000 Series firewalls?
CVE-2020-3585 does not impact Cisco Firepower 1000 Series firewalls.
What is the severity of CVE-2020-3585?
The severity of CVE-2020-3585 is medium with a severity value of 3.7.
How can an unauthenticated, remote attacker exploit CVE-2020-3585?
An unauthenticated, remote attacker can exploit CVE-2020-3585 to gain access to sensitive information.
Is there a fix available for CVE-2020-3585?
Yes, Cisco has released software updates to address CVE-2020-3585. Please refer to the Cisco Security Advisory for more information.
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- canonical/cisco firepower threat defense
- version/cisco firepower threat defense/6.5.0
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- canonical/cisco firepower 1000
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- canonical/cisco adaptive security appliance software
- version/cisco adaptive security appliance software/9.14