#VU103053 Inefficient regular expression complexity in nodejs-tmpl - CVE-2021-3777

Vulnerability identifier: #VU103053

Vulnerability 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-2021-3777

CWE-ID: CWE-1333

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
nodejs-tmpl
Other software / Other software solutions

Vendor: daaku

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 untrusted input with a regular expressions. A remote attacker can pass specially crafted data to the application and perform regular expression denial of service (ReDos) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

nodejs-tmpl: before 1.0.5

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External links
https://huntr.dev/bounties/a07b547a-f457-41c9-9d89-ee48bee8a4df
https://github.com/daaku/nodejs-tmpl/commit/4c654e4d1542f329ed561fd95ccd80f30c6872d6

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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.