[ASA-201908-17] libnghttp2: denial of service
Jelle van der Waa
jelle at archlinux.org
Thu Aug 29 16:27:52 UTC 2019
Arch Linux Security Advisory ASA-201908-17
==========================================
Severity: Medium
Date : 2019-08-27
CVE-ID : CVE-2019-9511 CVE-2019-9513
Package : libnghttp2
Type : denial of service
Remote : Yes
Link : https://security.archlinux.org/AVG-1024
Summary
=======
The package libnghttp2 before version 1.39.2-1 is vulnerable to denial
of service.
Resolution
==========
Upgrade to 1.39.2-1.
# pacman -Syu "libnghttp2>=1.39.2-1"
The problems have been fixed upstream in version 1.39.2.
Workaround
==========
None.
Description
===========
- CVE-2019-9511 (denial of service)
An issue has been found in several HTTP/2 implementations, where 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, potentially leading to a denial of service.
- CVE-2019-9513 (denial of service)
An issue has been found in several HTTP/2 implementations, where the
attacker creates multiple request streams and continually shuffles the
priority of the streams in a way that causes substantial churn to the
priority tree. This can consume excess CPU, potentially leading to a
denial of service.
Impact
======
A remote attacker is able to cause a denial of service by sending a
specially crafted packet.
References
==========
https://github.com/nghttp2/nghttp2/releases/tag/v1.39.2
https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md
https://github.com/nginx/nginx/commit/a987f81dd19210bc30b62591db331e31d3d74089
https://github.com/nginx/nginx/commit/5ae726912654da10a9a81b2c8436829f3e94f69f
https://security.archlinux.org/CVE-2019-9511
https://security.archlinux.org/CVE-2019-9513
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