Regular Expression Denial of Service in Deno

1) Incorrect Regular Expression

EUVDB-ID: #VU74119

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-26103

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 insufficient input validation when processing regular expressions in Deno.upgradeWebSocket API. 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

Deno: 1.12.0

External links

http://github.com/denoland/deno/pull/17722
http://github.com/denoland/deno/blob/2b247be517d789a37e532849e2e40b724af0918f/ext/http/01_http.js%23L395-L409
http://github.com/denoland/deno/commit/cf06a7c7e672880e1b38598fe445e2c50b4a9d06
http://github.com/denoland/deno/releases/tag/v1.31.0
http://security.snyk.io/vuln/SNYK-RUST-DENO-3315970

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.