PT-2022-4940 · Lighttpd+2 · Lighttpd+2

Michał Dardas · Published 2022-08-08 · Updated 2024-06-15 · CVE-2022-37797

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions lighttpd version 1.4.65

Description The issue is related to the mod wstunnel module in the lighttpd web server, which is connected to pointer dereference errors. If an invalid HTTP request, specifically a websocket handshake, is received, the handler function pointer is not initialized, leading to a null pointer dereference that crashes the server. This could be exploited by a remote attacker to cause a denial of service condition.

Recommendations For lighttpd version 1.4.65, as a temporary workaround, consider disabling the mod wstunnel module until a patch is available. Restrict access to the websocket handshake endpoint to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

DoS

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

ALT-PU-2022-2649

BDU:2022-06126

CVE-2022-37797

DLA-3133-1

DSA-5243-1

MGASA-2022-0369

OESA-2022-1989

OPENSUSE-SU-2022:10132-1

OPENSUSE-SU-2024:12327-1

Affected Products

Alt Linux

Lighttpd

Red Os

References · 30

• 🔥 https://redmine.lighttpd.net/issues/3165 · Exploit
• https://security.gentoo.org/glsa/202210-12 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2022-37797 · Security Note
• https://ubuntu.com/security/CVE-2022-37797 · Vendor Advisory
• https://osv.dev/vulnerability/MGASA-2022-0369 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2022-37797 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2022-41556 · Security Note
• https://osv.dev/vulnerability/OESA-2022-1989 · Vendor Advisory
• https://debian.org/security/2022/dsa-5243 · Vendor Advisory
• https://osv.dev/vulnerability/DSA-5243-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2022-37797 · Vendor Advisory
• https://bdu.fstec.ru/vul/2022-06126 · Security Note
• https://osv.dev/vulnerability/DLA-3133-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2022-37797 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2022:10132-1 · Vendor Advisory