CVE-2023-20107: cisco adaptive_security_appliance Insufficient Entropy in PRNG

Vulnerability summary

CVE-2023-20107 is a high (CVSS 7.5) Insufficient Entropy in PRNG vulnerability in cisco adaptive_security_appliance. EPSS estimates a 0.72% chance of exploitation in the next 30 days, higher than 53% of scored vulnerabilities.

Timeline

1. 23-03-2023
   PublishedVulnerability first disclosed.
2. 28-10-2024
   Last modifiedVulnerability information updated.

Description

A vulnerability in the deterministic random bit generator (DRBG), also known as pseudorandom number generator (PRNG), in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software for Cisco ASA 5506-X, ASA 5508-X, and ASA 5516-X Firewalls could allow an unauthenticated, remote attacker to cause a cryptographic collision, enabling the attacker to discover the private key of an affected device. This vulnerability is due to insufficient entropy in the DRBG for the affected hardware platforms when generating cryptographic keys. An attacker could exploit this vulnerability by generating a large number of cryptographic keys on an affected device and looking for collisions with target devices. A successful exploit could allow the attacker to impersonate an affected target device or to decrypt traffic secured by an affected key that is sent to or from an affected target device.

• CWE-332Insufficient Entropy in PRNGThe lack of entropy available for, or used by, a Pseudo-Random Number Generator (PRNG) can be a stability and security threat.
• CWE-331Insufficient EntropyThe product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others.