Improper Enforcement of Message or Data Structure Affecting libnghttp2 package, versions <0:1.33.0-1.1.6.amzn1


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.88% (84th percentile)

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  • Snyk IDSNYK-AMZN201803-LIBNGHTTP2-1723163
  • published27 Sept 2021
  • disclosed3 Jun 2020

Introduced: 3 Jun 2020

CVE-2020-11080  (opens in a new tab)
CWE-707  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2018.03 libnghttp2 to version 0:1.33.0-1.1.6.amzn1 or higher.
This issue was patched in ALAS-2020-1404.

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.

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.

CVSS Scores

version 3.1