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Resource Exhaustion Affecting httpd:2.4/httpd package, versions <0:2.4.37-64.module_el8.10.0+3761+75f8c656

Severity

 Recommended
0.0
medium
0
10

Based on AlmaLinux security rating

    Threat Intelligence

    EPSS
    0.4% (75th percentile)

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  • Snyk ID SNYK-ALMALINUX8-HTTPD-7169143
  • published 30 May 2024
  • disclosed 30 Apr 2024
Report a new vulnerability Found a mistake?

Introduced: 30 Apr 2024

CVE-2023-45802 Open this link in a new tab
CWE-400 Open this link in a new tab

How to fix?

Upgrade AlmaLinux:8 httpd:2.4/httpd to version 0:2.4.37-64.module_el8.10.0+3761+75f8c656 or higher.
This issue was patched in ALSA-2024:3121.

NVD Description

Note: Versions mentioned in the description apply only to the upstream httpd:2.4/httpd package and not the httpd:2.4/httpd package as distributed by AlmaLinux. See How to fix? for AlmaLinux:8 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.

References

CVSS Scores

version 3.1
Expand this section

NVD

5.9 medium
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    High
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    None
  • Integrity (I)
    None
  • Availability (A)
    High
Expand this section

Red Hat

7.5 high