Multiple vulnerabilities in Lighttpd

Published: 2022-09-29

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2022-41556 CVE-2022-37797
CWE-ID	CWE-401 CWE-476
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	lighttpd Server applications / Web servers
Vendor	lighttpd

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Memory leak

EUVDB-ID: #VU67733

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2022-41556

CWE-ID: CWE-401 - Improper Release of Memory Before Removing Last Reference ('Memory Leak')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform DoS attack on the target system.

The vulnerability exists due memory leak within the mod_fastcgi and mod_scgi modules when handling a large number of incorrect HTTP requests. A remote attacker can send multiple incorrect HTTP requests to the web server and perform denial of service attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

lighttpd: 1.4.0 - 1.4.66

CPE2.3

cpe:2.3:a:lighttpd:lighttpd:1.4.66:*:*:*:*:*:*:*

External links

http://www.debian.org/security/2022/dsa-5243

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

2) NULL pointer dereference

EUVDB-ID: #VU67731

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2022-37797

CWE-ID: CWE-476 - NULL Pointer Dereference