| Name | CVE-2023-43622 |
| Description | An attacker, opening a HTTP/2 connection with an initial window size of 0, was able to block handling of that connection indefinitely in Apache HTTP Server. This could be used to exhaust worker resources in the server, similar to the well known "slow loris" attack pattern. This has been fixed in version 2.4.58, so that such connection are terminated properly after the configured connection timeout. This issue affects Apache HTTP Server: from 2.4.55 through 2.4.57. Users are recommended to upgrade to version 2.4.58, which fixes the issue. |
| 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-5662-1 |
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 | jessie | (not affected) | |||
| apache2 | source | stretch | (not affected) | |||
| apache2 | source | buster | (not affected) | |||
| apache2 | source | bullseye | 2.4.59-1~deb11u1 | DSA-5662-1 | ||
| apache2 | source | bookworm | 2.4.59-1~deb12u1 | DSA-5662-1 | ||
| apache2 | source | (unstable) | 2.4.58-1 |
[buster] - apache2 <not-affected> (Vulnerable code introduced later)
https://www.openwall.com/lists/oss-security/2023/10/19/5
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2023-43622
[stretch] - apache2 <not-affected> (Vulnerable code introduced later)
[jessie] - apache2 <not-affected> (Vulnerable code introduced later)