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CVE-2022-41556

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Date: October 6, 2022

A resource leak in gw_backend.c in lighttpd 1.4.56 through 1.4.66 could lead to a denial of service (connection-slot exhaustion) after a large amount of anomalous TCP behavior by clients. It is related to RDHUP mishandling in certain HTTP/1.1 chunked situations. Use of mod_fastcgi is, for example, affected. This is fixed in 1.4.67.

Language: C

Severity Score

Related Resources (8)

https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OVOSBSCMLGCHH2Z74H64ZWVDFJFQTBC2/
https://github.com/lighttpd/lighttpd1.4/pull/115
https://git.lighttpd.net/lighttpd/lighttpd1.4/commit/b18de6f9264f914f7bf493abd3b6059343548e50
https://security.gentoo.org/glsa/202210-12
https://nvd.nist.gov/vuln/detail/CVE-2022-41556
https://github.com/lighttpd/lighttpd1.4/compare/lighttpd-1.4.66...lighttpd-1.4.67
https://security-tracker.debian.org/tracker/CVE-2022-41556
https://www.mend.io/vulnerability-database/CVE-2022-41556

Severity Score

Weakness Type (CWE)

Missing Release of Memory after Effective Lifetime

CWE-401

Top Fix

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Upgrade to version lighttpd-1.4.67

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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