#VU29692 Resource exhaustion in SockJS for Node - CVE-2020-7693

Vulnerability identifier: #VU29692

Vulnerability risk: Medium

CVSSv4.0: 7.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2020-7693

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
SockJS for Node
Web applications / JS libraries

Vendor: SockJS

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

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

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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.