CVE-2023-45802
Published: 23 October 2023
When a HTTP/2 stream was reset (RST frame) by a client, there was a time window were the request's memory resources were not reclaimed immediately. Instead, de-allocation was deferred to connection close. A client could send new requests and resets, keeping the connection busy and open and causing the memory footprint to keep on growing. On connection close, all resources were reclaimed, but the process might run out of memory before that. This was found by the reporter during testing of CVE-2023-44487 (HTTP/2 Rapid Reset Exploit) with their own test client. During "normal" HTTP/2 use, the probability to hit this bug is very low. The kept memory would not become noticeable before the connection closes or times out. Users are recommended to upgrade to version 2.4.58, which fixes the issue.
Notes
Author | Note |
---|---|
mdeslaur |
backporting this to jammy and earlier will likely require backporting the whole 2.0.10 version of the http/2 module as it refactors how connections and streams are handled: https://github.com/apache/httpd/commit/9767274b884a110e9244f59f50bd31ff1cae2933 |
Priority
Status
Package | Release | Status |
---|---|---|
apache2
Launchpad, Ubuntu, Debian |
bionic |
Needs triage
|
focal |
Released
(2.4.41-4ubuntu3.15)
|
|
jammy |
Released
(2.4.52-1ubuntu4.7)
|
|
lunar |
Released
(2.4.55-1ubuntu2.1)
|
|
mantic |
Released
(2.4.57-2ubuntu2.1)
|
|
noble |
Released
(2.4.58-1ubuntu1)
|
|
trusty |
Not vulnerable
(http2 support not implemented)
|
|
upstream |
Released
(2.4.58-1)
|
|
xenial |
Not vulnerable
(http2 not built)
|
|
Patches:
upstream: https://github.com/apache/httpd/commit/decce82a706abd78dfc32821a03ad93841d7758a upstream: https://github.com/apache/httpd/commit/3c6caeb2dc865bd08bf53a06844efe2f8c8c70bb |
Severity score breakdown
Parameter | Value |
---|---|
Base score | 5.9 |
Attack vector | Network |
Attack complexity | High |
Privileges required | None |
User interaction | None |
Scope | Unchanged |
Confidentiality | None |
Integrity impact | None |
Availability impact | High |
Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
References
- https://www.openwall.com/lists/oss-security/2023/10/19/6
- https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2023-45802
- https://github.com/icing/blog/blob/main/h2-rapid-reset.md#cve-2023-45802
- https://ubuntu.com/security/notices/USN-6506-1
- https://www.cve.org/CVERecord?id=CVE-2023-45802
- NVD
- Launchpad
- Debian