Denial of service in SockJS for Node

1) Resource exhaustion

EUVDB-ID: #VU29692

Risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2020-7693

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources within the "Upgrade" header with the value "websocket". A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

SockJS for Node: 0.0.0 rc1 - 0.3.19

External links

http://github.com/andsnw/sockjs-dos-py
http://github.com/sockjs/sockjs-node/commit/dd7e642cd69ee74385825816d30642c43e051d16
http://github.com/sockjs/sockjs-node/issues/252
http://github.com/sockjs/sockjs-node/pull/265
http://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-575448
http://snyk.io/vuln/SNYK-JS-SOCKJS-575261

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.