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List:       oss-security
Subject:    [oss-security] CVE-2023-45802: Apache HTTP Server: HTTP/2 stream memory not reclaimed right away on 
From:       Stefan Eissing <icing () apache ! org>
Date:       2023-10-19 9:41:13
Message-ID: a0276903-ad5c-7dfb-250e-9c812502a56c () apache ! org
[Download RAW message or body]

Severity: moderate

Affected versions:

- Apache HTTP Server 2.4.17 through 2.4.57

Description:

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.

Credit:

Will Dormann of Vul Labs (finder)
David Warren of Vul Labs (finder)

References:

https://httpd.apache.org/security/vulnerabilities_24.html
https://httpd.apache.org/
https://www.cve.org/CVERecord?id=CVE-2023-45802

Timeline:

2023-10-12: reported


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