{
    "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2022-29169",
        "STATE": "PUBLIC",
        "TITLE": "ReDoS on endpoint html5client/useragent in BigBlueButton"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "bigbluebutton",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": ">= 2.2, < 2.3.19"
                                        },
                                        {
                                            "version_value": ">= 2.4.0, < 2.4.7"
                                        },
                                        {
                                            "version_value": ">= 2.5-alpha-1, < 2.5.0-beta.2"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "bigbluebutton"
                }
            ]
        }
    },
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "BigBlueButton is an open source web conferencing system. Versions starting with 2.2 and prior to 2.3.19, 2.4.7, and 2.5.0-beta.2 are vulnerable to regular expression denial of service (ReDoS) attacks. By using specific a RegularExpression, an attacker can cause denial of service for the bbb-html5 service. The useragent library performs checking of device by parsing the input of User-Agent header and lets it go through lookupUserAgent() (alias of useragent.lookup() ). This function handles input by regexing and attackers can abuse that by providing some ReDos payload using `SmartWatch`. The maintainers removed `htmlclient/useragent` from versions 2.3.19, 2.4.7, and 2.5.0-beta.2. As a workaround, disable NginX forwarding the requests to the handler according to the directions in the GitHub Security Advisory."
            }
        ]
    },
    "impact": {
        "cvss": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-20: Improper Input Validation"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "name": "https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-rwrv-p665-4vwp",
                "refsource": "CONFIRM",
                "url": "https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-rwrv-p665-4vwp"
            },
            {
                "name": "https://github.com/bigbluebutton/bigbluebutton/pull/14886",
                "refsource": "MISC",
                "url": "https://github.com/bigbluebutton/bigbluebutton/pull/14886"
            },
            {
                "name": "https://github.com/bigbluebutton/bigbluebutton/pull/14896",
                "refsource": "MISC",
                "url": "https://github.com/bigbluebutton/bigbluebutton/pull/14896"
            }
        ]
    },
    "source": {
        "advisory": "GHSA-rwrv-p665-4vwp",
        "discovery": "UNKNOWN"
    }
}