Incorrect regular expression in faye websocket-extensions



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-7662
CWE-ID CWE-185
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Websocket-extensions
Other
Vendor Abdul Rafay

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Incorrect Regular Expression

EUVDB-ID: #VU103054

Risk: Medium

CVSSv4.0: 6.6 [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:U/U:Green]

CVE-ID: CVE-2020-7662

CWE-ID: CWE-185 - Incorrect Regular Expression

Exploit availability: No

Description

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

The vulnerability exists due to the extension parser may take quadratic time when parsing a header containing an unclosed string parameter value whose content is a repeating two-byte sequence of a backslash and some other character. A remote attacker can pass specially crafted data to the application and perform regular expression denial of service (ReDos) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Websocket-extensions: 0.1.0 - 0.1.3

CPE2.3 External links

https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions
https://github.com/faye/websocket-extensions-node/commit/29496f6838bfadfe5a2f85dff33ed0ba33873237
https://github.com/faye/websocket-extensions-node/security/advisories/GHSA-g78m-2chm-r7qv
https://snyk.io/vuln/SNYK-JS-WEBSOCKETEXTENSIONS-570623


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.



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