#VU67731 NULL pointer dereference in lighttpd - CVE-2022-37797

Vulnerability identifier: #VU67731

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-37797

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
lighttpd
Server applications / Web servers

Vendor: lighttpd

Description

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

The vulnerability exists due to a NULL pointer dereference error within the mod_wstunnel module when handling invalid HTTP requests. A remote attacker can send specially crafted HTTP requests to the affected web server and perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

lighttpd: 1.4.0 - 1.4.66

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External links
https://redmine.lighttpd.net/issues/3165
https://www.debian.org/security/2022/dsa-5243

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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.