| Name | CVE-2022-41556 |
| Description | 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-5243-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| lighttpd (PTS) | jessie, jessie (lts) | 1.4.35-4+deb8u1 | fixed |
| stretch (security), stretch (lts), stretch | 1.4.45-1+deb9u1 | fixed |
| buster (security), buster, buster (lts) | 1.4.53-4+deb10u3 | fixed |
| bullseye (security), bullseye | 1.4.59-1+deb11u2 | fixed |
| bookworm | 1.4.69-1 | fixed |
| sid, trixie | 1.4.76-1 | fixed |
The information below is based on the following data on fixed versions.
Notes
[buster] - lighttpd <not-affected> (vulnerable code inserted in lighttpd-1.4.55-211-gbcddbe18)
https://github.com/lighttpd/lighttpd1.4/pull/115
Introduced by: https://github.com/lighttpd/lighttpd1.4/commit/bcddbe186f010e2964f7551141c0b8350b36817d (lighttpd-1.4.56-rc1)
Fixed by: https://github.com/lighttpd/lighttpd1.4/commit/b18de6f9264f914f7bf493abd3b6059343548e50 (lighttpd-1.4.67)
[stretch] - lighttpd <not-affected> (introduced in 1.4.56)
[jessie] - lighttpd <not-affected> (introduced in 1.4.56)