SB2020022610 - Regular Expression Denial of Service (ReDoS) in uap-core
Published: February 26, 2020
Security Bulletin ID
SB2020022610
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-2020-5243)
The vulnerability allows a remote attacker to perform a regular expression denial of service (REDoS).
The vulnerability exists due to overlapping capture groups when processing crafted User-Agent strings. A remote attacker can overload a server by setting the User-Agent header in an HTTP(S) request to maliciously crafted long strings, trigger resource exhaustion and perform a regular expression denial of service (REDoS) attack.
Remediation
Install update from vendor's website.