Allocation of Resources Without Limits or Throttling Affecting httpd24 package, versions <0:2.4.41-1.88.amzn1


Severity

Recommended
medium

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
4.56% (89th percentile)

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  • Snyk IDSNYK-AMZN201803-HTTPD24-1719888
  • published27 Sept 2021
  • disclosed13 Aug 2019

Introduced: 13 Aug 2019

CVE-2019-9517  (opens in a new tab)
CWE-770  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2018.03 httpd24 to version 0:2.4.41-1.88.amzn1 or higher.
This issue was patched in ALAS-2019-1311.

NVD Description

Note: Versions mentioned in the description apply only to the upstream httpd24 package and not the httpd24 package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2018.03 relevant fixed versions and status.

Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint; however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the wire. The attacker then sends a stream of requests for a large response object. Depending on how the servers queue the responses, this can consume excess memory, CPU, or both.

References

CVSS Base Scores

version 3.1