CVE-2020-11080

NameCVE-2020-11080
DescriptionIn nghttp2 before version 1.41.0, the overly large HTTP/2 SETTINGS frame payload causes denial of service. The proof of concept attack involves a malicious client constructing a SETTINGS frame with a length of 14,400 bytes (2400 individual settings entries) over and over again. The attack causes the CPU to spike at 100%. nghttp2 v1.41.0 fixes this vulnerability. There is a workaround to this vulnerability. Implement nghttp2_on_frame_recv_callback callback, and if received frame is SETTINGS frame and the number of settings entries are large (e.g., > 32), then drop the connection.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-2786-1, DLA-3621-1, DSA-4696-1, ELA-490-1
Debian Bugs962145

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
nghttp2 (PTS)jessie, jessie (lts)0.6.4-2+deb8u1fixed
stretch (security)1.18.1-1+deb9u2fixed
stretch (lts), stretch1.18.1-1+deb9u4fixed
buster (security), buster, buster (lts)1.36.0-2+deb10u3fixed
bullseye1.43.0-1+deb11u1fixed
bullseye (security)1.43.0-1+deb11u2fixed
bookworm (security), bookworm1.52.0-1+deb12u1fixed
sid, trixie1.64.0-1fixed
nodejs (PTS)jessie0.10.29~dfsg-2vulnerable
stretch4.8.2~dfsg-1vulnerable
buster (security), buster, buster (lts)10.24.0~dfsg-1~deb10u4fixed
bullseye12.22.12~dfsg-1~deb11u4fixed
bullseye (security)12.22.12~dfsg-1~deb11u5fixed
bookworm18.19.0+dfsg-6~deb12u2fixed
bookworm (security)18.19.0+dfsg-6~deb12u1fixed
sid, trixie20.17.0+dfsg-2fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
nghttp2sourcejessie0.6.4-2+deb8u1ELA-490-1
nghttp2sourcestretch1.18.1-1+deb9u2DLA-2786-1
nghttp2sourcebuster1.36.0-2+deb10u2DLA-3621-1
nghttp2source(unstable)1.41.0-1
nodejssourcejessie(unfixed)end-of-life
nodejssourcebuster10.21.0~dfsg-1~deb10u1DSA-4696-1
nodejssource(unstable)10.21.0~dfsg-1962145

Notes

[stretch] - nodejs <ignored> (Nodejs in stretch not covered by security support)
[jessie] - nodejs <end-of-life> (Nodejs in jessie not covered by security support)
https://github.com/nghttp2/nghttp2/security/advisories/GHSA-q5wr-xfw9-q7xr
https://github.com/nghttp2/nghttp2/commit/336a98feb0d56b9ac54e12736b18785c27f75090 (v1.41.0)
https://github.com/nghttp2/nghttp2/commit/f8da73bd042f810f34d19f9eae02b46d870af394 (v1.41.0)
https://nodejs.org/en/blog/vulnerability/june-2020-security-releases/#http-2-large-settings-frame-dos-low-cve-2020-11080

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