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Allocation of Resources Without Limits or Throttling Affecting libnghttp2 package, versions <0:1.33.0-3.el8_2.1

0.0
high

Snyk CVSS

    Attack Complexity Low
    Availability High

    Threat Intelligence

    EPSS 1.09% (85th percentile)
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NVD
7.5 high
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SUSE
7.5 high
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Red Hat
7.5 high

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  • Snyk ID SNYK-CENTOS8-LIBNGHTTP2-2042278
  • published 26 Jul 2021
  • disclosed 2 Jun 2020
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Introduced: 2 Jun 2020

CVE-2020-11080 Open this link in a new tab
CWE-770 Open this link in a new tab

How to fix?

Upgrade Centos:8 libnghttp2 to version 0:1.33.0-3.el8_2.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libnghttp2 package and not the libnghttp2 package as distributed by Centos. See How to fix? for Centos:8 relevant fixed versions and status.

In nghttp2 before version 1.41.0, the overly large HTTP/2 SETTINGS frame payload causes denial of service. The proof of concept attack involves a malicious client constructing a SETTINGS frame with a length of 14,400 bytes (2400 individual settings entries) over and over again. The attack causes the CPU to spike at 100%. nghttp2 v1.41.0 fixes this vulnerability. There is a workaround to this vulnerability. Implement nghttp2_on_frame_recv_callback callback, and if received frame is SETTINGS frame and the number of settings entries are large (e.g., > 32), then drop the connection.

References