Improper Resource Shutdown or Release Affecting apache2 package, versions <2.4.59-1~deb10u1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.11% (47th percentile)

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  • Snyk IDSNYK-DEBIAN10-APACHE2-6015864
  • published20 Oct 2023
  • disclosed23 Oct 2023

Introduced: 20 Oct 2023

CVE-2023-45802  (opens in a new tab)
CWE-404  (opens in a new tab)

How to fix?

Upgrade Debian:10 apache2 to version 2.4.59-1~deb10u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream apache2 package and not the apache2 package as distributed by Debian. See How to fix? for Debian:10 relevant fixed versions and status.

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.

CVSS Scores

version 3.1