#VU67732 Resource exhaustion in lighttpd - CVE-2022-30780

Vulnerability identifier: #VU67732

Vulnerability risk: Medium

CVSSv4.0: 7.7 [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:P/U:Green]

CVE-ID: CVE-2022-30780

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: Yes

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 application does not properly control consumption of internal resources within the connection_read_header_more() function in connections.c. A remote attacker can trigger resource exhaustion by sending multiple requests with large HTTP headers and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

lighttpd: 1.4.56 - 1.4.58

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External links
https://redmine.lighttpd.net/issues/3059
https://podalirius.net/en/cves/2022-30780/
https://github.com/p0dalirius/CVE-2022-30780-lighttpd-denial-of-service

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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. However, proof of concept for this vulnerability is available.