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
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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 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

Exploit availability: No

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


CPE2.3 External links

http://redmine.lighttpd.net/issues/3165
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?



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