Vulnerability in F5 Big-Ip Access Policy Manager
CVE-2020-5929
In versions 13.0.0-13.0.0 HF2, 12.1.0-12.1.2 HF1, and 11.6.1-11.6.2, BIG-IP platforms with Cavium Nitrox SSL hardware acceleration cards, a Virtual Server configured with a Client SSL profile, and using Anonymous (ADH) or Ephemeral (DHE) Diffie-Hellman key exchange and Single DH use option not enabled in the options list may be vulnerable to crafted SSL/TLS Handshakes that may result with a PMS (Pre-Master Secret) that starts in a 0 byte and may lead to a recovery of plaintext messages as BIG-IP TLS/SSL ADH/DHE sends different error messages acting as an oracle. Similar error messages when PMS starts with 0 byte coupled with very precise timing measurement observation may also expose this vulnerability.
EPSS: 0.012 (65.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
Affected products
- F5 Big-ip_access_policy_manager — versions 11.6.2, 12.1.2, 13.0.0
- F5 Big-ip_advanced_firewall_manager — versions 11.6.2, 12.1.2, 13.0.0
- F5 Big-ip_advanced_web_application_firewall — versions 11.6.2, 12.1.2, 13.0.0
- F5 Big-ip_analytics — versions 11.6.2, 12.1.2, 13.0.0
- F5 Big-ip_application_acceleration_manager — versions 11.6.2, 12.1.2, 13.0.0
- F5 Big-ip_application_security_manager — versions 11.6.2, 12.1.2, 13.0.0
- F5 Big-ip_ddos_hybrid_defender — versions 11.6.2, 12.1.2, 13.0.0
- F5 Big-ip_domain_name_system — versions 11.6.2, 12.1.2, 13.0.0
- F5 Big-ip_fraud_protection_service — versions 11.6.2, 12.1.2, 13.0.0
- F5 Big-ip_global_traffic_manager — versions 11.6.2, 12.1.2, 13.0.0
Weakness classification (CWE)
References
- f5sirt@f5.com (x_refsource_MISC, Vendor Advisory)
Frequently asked questions
- What is CVE-2020-5929?
- CVE-2020-5929 is a medium-severity vulnerability in F5 Big-Ip Access Policy Manager, classified under Observable Discrepancy. CVSS score: 5.9/10. Published 2020-09-25.
- How severe is CVE-2020-5929?
- Medium severity. CVSS v3 base score is 5.9 out of 10.