CVE-2020-5938 : Security Advisory and Response
Learn about CVE-2020-5938 affecting BIG-IP versions 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, and 11.6.1-11.6.5.2. Understand the security downgrade issue during IPSec tunnel negotiation and how to mitigate it.
A security vulnerability affecting BIG-IP versions 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, and 11.6.1-11.6.5.2 allows peers to negotiate a different key length during IPSec tunnel negotiation.
Understanding CVE-2020-5938
This CVE involves a security downgrade issue on BIG-IP devices during IPSec tunnel negotiation.
What is CVE-2020-5938?
When authenticated peers negotiate IPSec tunnels with BIG-IP devices, a vulnerability allows the peer to negotiate a key length different from what the BIG-IP configuration permits.
The Impact of CVE-2020-5938
This vulnerability could lead to a security downgrade, potentially compromising the confidentiality and integrity of IPSec communications.
Technical Details of CVE-2020-5938
This section provides more technical insights into the vulnerability.
Vulnerability Description
The issue occurs in BIG-IP versions 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, and 11.6.1-11.6.5.2 during IPSec tunnel negotiation with authenticated peers.
Affected Systems and Versions
- BIG-IP versions 13.1.0-13.1.3.4
- BIG-IP versions 12.1.0-12.1.5.2
- BIG-IP versions 11.6.1-11.6.5.2
Exploitation Mechanism
Peers negotiating IPSec tunnels can exploit this vulnerability by negotiating a key length different from the configured settings on the BIG-IP device.
Mitigation and Prevention
To address CVE-2020-5938, follow these mitigation steps:
Immediate Steps to Take
- Monitor vendor security advisories for patches
- Implement firewall rules to restrict access to affected systems
Long-Term Security Practices
- Regularly update and patch BIG-IP devices
- Conduct security assessments and audits to identify vulnerabilities
Patching and Updates
- Apply patches provided by the vendor to fix the vulnerability