#VU87787 Inefficient regular expression complexity in debug - CVE-2017-20165

Vulnerability identifier: #VU87787

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-2017-20165

CWE-ID: CWE-1333

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
debug
Other software / Other software solutions

Vendor: Qix

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 in the function useColors of the file src/node.js. 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

debug: 0.1.0 - 3.0.1

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External links
https://github.com/debug-js/debug/pull/504
https://vuldb.com/?ctiid.217665
https://github.com/debug-js/debug/commit/c38a0166c266a679c8de012d4eaccec3f944e685
https://github.com/debug-js/debug/releases/tag/3.1.0
https://vuldb.com/?id.217665

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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.