SB2020121736 - Denial of service in F5 BIG-IP ASM and Advanced WAF
Published: December 17, 2020
Security Bulletin ID
SB2020121736
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Resource exhaustion (CVE-ID: CVE-2020-27718)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to application does not properly control consumption of internal resources when processing requests with JSON payload. A remote attacker can send an unusually large number of parameters and consume all available CPU resources on the system.
Only BIG-IP ASM systems configured with JSON content profile with parameter parsing (enabled by default) are affected.
Remediation
Install update from vendor's website.