CVE-2022-20940 Weak cryptography in Cisco Firepower Threat Defense Software
An unauthenticated remote attacker can decrypt previously captured TLS sessions by exploiting a Bleichenbacher attack vulnerability in the TLS handler.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2022-20940?
CVE-2022-20940 is a medium-severity vulnerability in Cisco Secure Firewall Threat Defense, published on 10 Nov 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the TLS handler of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to gain access to sensitive information. This vulnerability is due to improper implementation of countermeasures against a Bleichenbacher attack on a device that uses SSL decryption policies. An attacker could exploit this vulnerability by sending crafted TLS messages to an affected 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.
Weakness: CWE-203
Which versions are affected by CVE-2022-20940?
It affects 1 product.
Products include Cisco Secure Firewall Threat Defense.
How do I fix CVE-2022-20940?
No fix has been published for CVE-2022-20940 yet. Limit exposure of the affected software until one is available.
Is CVE-2022-20940 being exploited?
There is no known exploitation of CVE-2022-20940 in the wild and no public exploit code.
Other vulnerabilities in Cisco Secure Firewall Threat Defense
- CVE-2024-20412 Hardcoded credentials in Cisco Firepower Threat Defense Software
- CVE-2024-20330 Memory corruption in Cisco Firepower Threat Defense Software
- CVE-2024-20339 Cisco Firepower Threat Defense Software for Firepower 2100 Series TLS Denial of Service Vulnerability
- CVE-2024-20351 Cisco Firepower Threat Defense Software Snort Firewall Denial of Service Vulnerability
- CVE-2023-20083 Denial of service in Cisco Firepower Threat Defense Software
Sources
Also known as GHSA-xqwj-v278-6v7x.