RubySec

Providing security resources for the Ruby community

CVE-2020-5243 (user_agent_parser): Denial of Service in uap-core when processing crafted User-Agent strings

ADVISORIES

GEM

user_agent_parser

SEVERITY

CVSS v3: 5.7 (Medium)

PATCHED VERSIONS

  • >= 2.6.0

DESCRIPTION

Impact

Some regexes are vulnerable to regular expression denial of service (REDoS) due to overlapping capture groups. This allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to maliciously crafted long strings.

Patches

Please update uap-ruby to >= v2.6.0

For more information

https://github.com/ua-parser/uap-core/security/advisories/GHSA-cmcx-xhr8-3w9p