CVE-2022-41556
First published: Thu Oct 06 2022(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/lighttpd | 1.4.53-4+deb10u2 1.4.53-4+deb10u3 1.4.59-1+deb11u2 1.4.69-1 | |
| Lighttpd Lighttpd | >=1.4.56<1.4.67 | |
| Fedoraproject Fedora | =35 |
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Reference Links
- https://github.com/lighttpd/lighttpd1.4/pull/115
- https://github.com/lighttpd/lighttpd1.4/commit/bcddbe186f010e2964f7551141c0b8350b36817d
- https://github.com/lighttpd/lighttpd1.4/commit/b18de6f9264f914f7bf493abd3b6059343548e50
- https://security-tracker.debian.org/tracker/CVE-2022-41556
- https://git.lighttpd.net/lighttpd/lighttpd1.4/commit/b18de6f9264f914f7bf493abd3b6059343548e50
- https://github.com/lighttpd/lighttpd1.4/compare/lighttpd-1.4.66...lighttpd-1.4.67
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OVOSBSCMLGCHH2Z74H64ZWVDFJFQTBC2/
- https://security.gentoo.org/glsa/202210-12
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OVOSBSCMLGCHH2Z74H64ZWVDFJFQTBC2/
Frequently Asked Questions
What is CVE-2022-41556?
CVE-2022-41556 is a vulnerability in lighttpd versions 1.4.56 through 1.4.66 that could lead to a denial of service due to connection-slot exhaustion.
How does CVE-2022-41556 affect lighttpd?
CVE-2022-41556 affects lighttpd versions 1.4.56 through 1.4.66 by causing a resource leak in gw_backend.c, leading to connection-slot exhaustion and a denial of service.
What is the severity of CVE-2022-41556?
CVE-2022-41556 has a severity rating of 7.5 (high).
How can I fix CVE-2022-41556?
To fix CVE-2022-41556, it is recommended to update lighttpd to version 1.4.67 or apply the necessary patches provided by the vendor.
Where can I find more information about CVE-2022-41556?
More information about CVE-2022-41556 can be found in the following references: [link1], [link2], [link3].
- collector/security-tracker-debian
- collector/nvd-index
- agent/severity
- agent/author
- agent/references
- agent/weakness
- agent/type
- agent/description
- agent/event
- agent/remedy
- agent/last-modified-date
- agent/softwarecombine
- agent/first-publish-date
- agent/tags
- collector/mitre-cve
- source/MITRE
- package-manager/debian
- vendor/lighttpd
- canonical/lighttpd lighttpd
- version/lighttpd lighttpd/1.4.56
- vendor/fedoraproject
- canonical/fedoraproject fedora
- version/fedoraproject fedora/35