Denial of service in lighttpd

1) Out-of-bounds read

EUVDB-ID: #VU59537

Risk: Medium

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

CVE-ID: CVE-2022-22707

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

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

The vulnerability exists due to a boundary condition in the mod_extforward_Forwarded function of the mod_extforward plugin. A remote attacker can send a specially crafted request to the web server, trigger an out-of-bounds read error and perform a denial of service attack.

Successful exploitation of the vulnerability requires a non-default configuration for handling of the Forwarded header.

Mitigation

Install update from vendor's website.

Vulnerable software versions

lighttpd: 1.4.46 - 1.4.63

CPE2.3

• cpe:2.3:a:lighttpd:lighttpd:1.4.46:*:*:*:*:*:*:*
• cpe:2.3:a:lighttpd:lighttpd:1.4.47:*:*:*:*:*:*:*
• cpe:2.3:a:lighttpd:lighttpd:1.4.48:*:*:*:*:*:*:*

External links

https://redmine.lighttpd.net/issues/3134

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.