| Name | CVE-2019-9517 |
| Description | Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint; however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the wire. The attacker then sends a stream of requests for a large response object. Depending on how the servers queue the responses, this can consume excess memory, CPU, or both. |
| 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-4509-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| apache2 (PTS) | jessie, jessie (lts) | 2.4.10-10+deb8u29 | fixed |
| stretch (security) | 2.4.25-3+deb9u13 | fixed | |
| stretch (lts), stretch | 2.4.25-3+deb9u19 | fixed | |
| buster, buster (lts) | 2.4.59-1~deb10u4 | fixed | |
| buster (security) | 2.4.59-1~deb10u1 | fixed | |
| bullseye | 2.4.62-1~deb11u1 | fixed | |
| bullseye (security) | 2.4.62-1~deb11u2 | fixed | |
| bookworm (security), bookworm | 2.4.62-1~deb12u2 | fixed | |
| sid, trixie | 2.4.62-3 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| apache2 | source | wheezy | (not affected) | |||
| apache2 | source | jessie | (not affected) | |||
| apache2 | source | stretch | 2.4.25-3+deb9u8 | DSA-4509-1 | ||
| apache2 | source | buster | 2.4.38-3+deb10u1 | DSA-4509-1 | ||
| apache2 | source | (unstable) | 2.4.41-1 |
[jessie] - apache2 <not-affected> (HTTP/2 support only available since version 2.4.17 and later)
Affects upstream versions 2.4.20 to 2.4.39
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2019-9517
https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md
[wheezy] - apache2 <not-affected> (HTTP/2 support was first introduced in version 2.4.17)