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Improper Enforcement of Message or Data Structure Affecting nghttp2 package, versions <1.18.1-1+deb9u2

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-DEBIAN9-NGHTTP2-1584533
  • published 3 Jun 2020
  • disclosed 3 Jun 2020
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Introduced: 3 Jun 2020

CVE-2020-11080 Open this link in a new tab
CWE-707 Open this link in a new tab

How to fix?

Upgrade Debian:9 nghttp2 to version 1.18.1-1+deb9u2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream nghttp2 package and not the nghttp2 package as distributed by Debian. See How to fix? for Debian:9 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