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Allocation of Resources Without Limits or Throttling Affecting libnghttp2 package, versions <0:1.31.1-2.5.amzn1

high

Snyk CVSS

    Attack Complexity Low
    Availability High

    Threat Intelligence

    EPSS 9.69% (95th percentile)
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NVD
7.5 high
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SUSE
7.5 high
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Red Hat
6.5 medium

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  • Snyk ID SNYK-AMZN201803-LIBNGHTTP2-1720215
  • published 27 Sep 2021
  • disclosed 13 Aug 2019
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Introduced: 13 Aug 2019

CVE-2019-9511 Open this link in a new tab
CWE-770 Open this link in a new tab

How to fix?

Upgrade Amazon-Linux:2018.03 libnghttp2 to version 0:1.31.1-2.5.amzn1 or higher.
This issue was patched in ALAS-2019-1298.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libnghttp2 package and not the libnghttp2 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 window size manipulation and stream prioritization manipulation, potentially leading to a denial of service. The attacker requests a large amount of data from a specified resource over multiple streams. They manipulate window size and stream priority to force the server to queue the data in 1-byte chunks. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.

References