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CVE-2020-5929

MEDIUMCVSS 5.9/10EPSS 1.21%

Last modified

CVE-2020-5929 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. 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 estimates a 1.21% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
5.9/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability
1.21%

64.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
F5Big-Ip Access Policy Manager>= 11.6.1, < 11.6.2
F5Big-Ip Access Policy Manager>= 12.1.0, < 12.1.2
F5Big-Ip Access Policy Manager11.6.2
F5Big-Ip Access Policy Manager12.1.2
F5Big-Ip Access Policy Manager13.0.0
F5Big-Ip Advanced Firewall Manager>= 11.6.1, < 11.6.2
F5Big-Ip Advanced Firewall Manager>= 12.1.0, < 12.1.2
F5Big-Ip Advanced Firewall Manager11.6.2
F5Big-Ip Advanced Firewall Manager12.1.2
F5Big-Ip Advanced Firewall Manager13.0.0
F5Big-Ip Advanced Web Application Firewall>= 11.6.1, < 11.6.2
F5Big-Ip Advanced Web Application Firewall>= 12.1.0, < 12.1.2
F5Big-Ip Advanced Web Application Firewall11.6.2
F5Big-Ip Advanced Web Application Firewall12.1.2
F5Big-Ip Advanced Web Application Firewall13.0.0
F5Big-Ip Analytics>= 11.6.1, < 11.6.2
F5Big-Ip Analytics>= 12.1.0, < 12.1.2
F5Big-Ip Analytics11.6.2
F5Big-Ip Analytics12.1.2
F5Big-Ip Analytics13.0.0
F5Big-Ip Application Acceleration Manager>= 11.6.1, < 11.6.2
F5Big-Ip Application Acceleration Manager>= 12.1.0, < 12.1.2
F5Big-Ip Application Acceleration Manager11.6.2
F5Big-Ip Application Acceleration Manager12.1.2
F5Big-Ip Application Acceleration Manager13.0.0
F5Big-Ip Application Security Manager>= 11.6.1, < 11.6.2
F5Big-Ip Application Security Manager>= 12.1.0, < 12.1.2
F5Big-Ip Application Security Manager11.6.2
F5Big-Ip Application Security Manager12.1.2
F5Big-Ip Application Security Manager13.0.0
F5Big-Ip Ddos Hybrid Defender>= 11.6.1, < 11.6.2
F5Big-Ip Ddos Hybrid Defender>= 12.1.0, < 12.1.2
F5Big-Ip Ddos Hybrid Defender11.6.2
F5Big-Ip Ddos Hybrid Defender12.1.2
F5Big-Ip Ddos Hybrid Defender13.0.0
F5Big-Ip Domain Name System>= 11.6.1, < 11.6.2
F5Big-Ip Domain Name System>= 12.1.0, < 12.1.2
F5Big-Ip Domain Name System11.6.2
F5Big-Ip Domain Name System12.1.2
F5Big-Ip Domain Name System13.0.0
F5Big-Ip Fraud Protection Service>= 11.6.1, < 11.6.2
F5Big-Ip Fraud Protection Service>= 12.1.0, < 12.1.2
F5Big-Ip Fraud Protection Service11.6.2
F5Big-Ip Fraud Protection Service12.1.2
F5Big-Ip Fraud Protection Service13.0.0
F5Big-Ip Global Traffic Manager>= 11.6.1, < 11.6.2
F5Big-Ip Global Traffic Manager>= 12.1.0, < 12.1.2
F5Big-Ip Global Traffic Manager11.6.2
F5Big-Ip Global Traffic Manager12.1.2
F5Big-Ip Global Traffic Manager13.0.0

Showing 50 of 70 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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.
How severe is CVE-2020-5929?
CVE-2020-5929 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 1.21% probability of exploitation in the next 30 days.
How do I fix CVE-2020-5929?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST