Vulnerability Information
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Vulnerability Title
ReDoS on endpoint html5client/useragent in BigBlueButton
Vulnerability 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.
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vulnerability Type
输入验证不恰当
Vulnerability Title
BigBlueButton 输入验证错误漏洞
Vulnerability Description
BigBlueButton是BigBlueButton社区的一套开源的Web会议系统。 BigBlueButton 2.2 到 2.3.19、2.4.7 和 2.5.0-beta.2 之前版本存在输入验证错误漏洞，该漏洞源于容易受到正则表达式拒绝服务 (ReDoS) 攻击。攻击者利用该漏洞可以通过使用特定的正则表达式对 bbb-html5 服务造成拒绝服务。
CVSS Information
N/A
Vulnerability Type
N/A