Vulnerability Description
A vulnerability in the handling of RSA keys on devices running Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to retrieve an RSA private key. This vulnerability is due to a logic error when the RSA key is stored in memory on a hardware platform that performs hardware-based cryptography. An attacker could exploit this vulnerability by using a Lenstra side-channel attack against the targeted device. A successful exploit could allow the attacker to retrieve the RSA private key. The following conditions may be observed on an affected device: This vulnerability will apply to approximately 5 percent of the RSA keys on a device that is running a vulnerable release of Cisco ASA Software or Cisco FTD Software; not all RSA keys are expected to be affected due to mathematical calculations applied to the RSA key. The RSA key could be valid but have specific characteristics that make it vulnerable to the potential leak of the RSA private key. If an attacker obtains the RSA private key, they could use the key to impersonate a device that is running Cisco ASA Software or Cisco FTD Software or to decrypt the device traffic. See the Indicators of Compromise section for more information on the detection of this type of RSA key. The RSA key could be malformed and invalid. A malformed RSA key is not functional, and a TLS client connection to a device that is running Cisco ASA Software or Cisco FTD Software that uses the malformed RSA key will result in a TLS signature failure, which means a vulnerable software release created an invalid RSA signature that failed verification. If an attacker obtains the RSA private key, they could use the key to impersonate a device that is running Cisco ASA Software or Cisco FTD Software or to decrypt the device traffic.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Adaptive Security Appliance Software | >= 9.16.0, < 9.16.3.19 |
| Cisco | Firepower Threat Defense | >= 7.0.0, < 7.0.4 |
| Cisco | Asa 5506-X | - |
| Cisco | Asa 5506H-X | - |
| Cisco | Asa 5506W-X | - |
| Cisco | Asa 5508-X | - |
| Cisco | Asa 5516-X | - |
| Cisco | Firepower 1000 | - |
| Cisco | Firepower 1010 | - |
| Cisco | Firepower 1020 | - |
| Cisco | Firepower 1030 | - |
| Cisco | Firepower 1040 | - |
| Cisco | Firepower 1120 | - |
| Cisco | Firepower 1140 | - |
| Cisco | Firepower 1150 | - |
| Cisco | Firepower 2100 | - |
| Cisco | Firepower 2110 | - |
| Cisco | Firepower 2120 | - |
| Cisco | Firepower 2130 | - |
| Cisco | Firepower 2140 | - |
Related Weaknesses (CWE)
References
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-aVendor Advisory
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-aVendor Advisory
FAQ
What is CVE-2022-20866?
CVE-2022-20866 is a vulnerability with a CVSS score of 7.4 (HIGH). A vulnerability in the handling of RSA keys on devices running Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote...
How severe is CVE-2022-20866?
CVE-2022-20866 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-20866?
Check the references section above for vendor advisories and patch information. Affected products include: Cisco Adaptive Security Appliance Software, Cisco Firepower Threat Defense, Cisco Asa 5506-X, Cisco Asa 5506H-X, Cisco Asa 5506W-X.