CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
94.3%
Issue Overview:
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. (CVE-2019-9511)
Some HTTP/2 implementations are vulnerable to resource loops, potentially leading to a denial of service. 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. (CVE-2019-9513)
Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service. The attacker sends a stream of headers with a 0-length header name and 0-length header value, optionally Huffman encoded into 1-byte or greater headers. Some implementations allocate memory for these headers and keep the allocation alive until the session dies. This can consume excess memory. (CVE-2019-9516)
Affected Packages:
nginx
Issue Correction:
Run yum update nginx to update your system.
New Packages:
i686:
nginx-mod-stream-1.16.1-1.37.amzn1.i686
nginx-all-modules-1.16.1-1.37.amzn1.i686
nginx-mod-http-xslt-filter-1.16.1-1.37.amzn1.i686
nginx-mod-http-image-filter-1.16.1-1.37.amzn1.i686
nginx-1.16.1-1.37.amzn1.i686
nginx-mod-http-geoip-1.16.1-1.37.amzn1.i686
nginx-mod-mail-1.16.1-1.37.amzn1.i686
nginx-mod-http-perl-1.16.1-1.37.amzn1.i686
nginx-debuginfo-1.16.1-1.37.amzn1.i686
src:
nginx-1.16.1-1.37.amzn1.src
x86_64:
nginx-mod-http-image-filter-1.16.1-1.37.amzn1.x86_64
nginx-mod-mail-1.16.1-1.37.amzn1.x86_64
nginx-mod-stream-1.16.1-1.37.amzn1.x86_64
nginx-debuginfo-1.16.1-1.37.amzn1.x86_64
nginx-1.16.1-1.37.amzn1.x86_64
nginx-mod-http-perl-1.16.1-1.37.amzn1.x86_64
nginx-mod-http-geoip-1.16.1-1.37.amzn1.x86_64
nginx-all-modules-1.16.1-1.37.amzn1.x86_64
nginx-mod-http-xslt-filter-1.16.1-1.37.amzn1.x86_64
Red Hat: CVE-2019-9511, CVE-2019-9513, CVE-2019-9516
Mitre: CVE-2019-9511, CVE-2019-9513, CVE-2019-9516
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
94.3%