Overview
- Description
- 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.
- Source
- security-advisories@github.com
- NVD status
- Analyzed
Risk scores
CVSS 3.1
- Type
- Primary
- Base score
- 7.5
- Impact score
- 3.6
- Exploitability score
- 3.9
- Vector string
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Severity
- HIGH
CVSS 2.0
- Type
- Primary
- Base score
- 5
- Impact score
- 2.9
- Exploitability score
- 10
- Vector string
- AV:N/AC:L/Au:N/C:N/I:N/A:P
Social media
- Hype score
- Not currently trending
Configurations
[
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:bigbluebutton:bigbluebutton:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "3A9BA43E-5B7C-4B62-AE0E-72776BD3F281",
"versionEndExcluding": "2.3.19",
"versionStartIncluding": "2.2.0"
},
{
"criteria": "cpe:2.3:a:bigbluebutton:bigbluebutton:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "2DC6C975-3730-40C0-9FE1-EE4A40BCF98B",
"versionEndExcluding": "2.4.7",
"versionStartIncluding": "2.4.0"
},
{
"criteria": "cpe:2.3:a:bigbluebutton:bigbluebutton:2.5:alpha1:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "5380CCEF-88B8-43AA-A76E-18076B1CAE94"
},
{
"criteria": "cpe:2.3:a:bigbluebutton:bigbluebutton:2.5:alpha2:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "B30DFF3F-F71E-4412-88F8-790A4A4F459B"
},
{
"criteria": "cpe:2.3:a:bigbluebutton:bigbluebutton:2.5:alpha3:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "F75A0FD2-BF0A-42AE-8D87-1A749BF1B47F"
},
{
"criteria": "cpe:2.3:a:bigbluebutton:bigbluebutton:2.5:alpha4:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "454FF756-9526-4A5E-A2A5-390393791F37"
},
{
"criteria": "cpe:2.3:a:bigbluebutton:bigbluebutton:2.5:alpha5:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "F7AC4A50-4156-4856-B92D-09E128169D17"
},
{
"criteria": "cpe:2.3:a:bigbluebutton:bigbluebutton:2.5:alpha6:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "2AB075EF-BD7A-4AD6-9B0E-2A0242198626"
},
{
"criteria": "cpe:2.3:a:bigbluebutton:bigbluebutton:2.5:beta1:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "080771DC-2CB1-4397-B10E-3B267A476205"
}
],
"operator": "OR"
}
]
}
]