7.8 High
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
7.5 High
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
7.7 High
AI Score
Confidence
High
0.097 Low
EPSS
Percentile
94.8%
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 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)
Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint; however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the wire. The attacker then sends a stream of requests for a large response object. Depending on how the servers queue the responses, this can consume excess memory, CPU, or both.(CVE-2019-9517)
Affected Packages:
mod_http2
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update mod_http2 to update your system.
New Packages:
aarch64:
mod_http2-1.15.3-2.amzn2.aarch64
mod_http2-debuginfo-1.15.3-2.amzn2.aarch64
i686:
mod_http2-1.15.3-2.amzn2.i686
mod_http2-debuginfo-1.15.3-2.amzn2.i686
src:
mod_http2-1.15.3-2.amzn2.src
x86_64:
mod_http2-1.15.3-2.amzn2.x86_64
mod_http2-debuginfo-1.15.3-2.amzn2.x86_64
Red Hat: CVE-2019-9511, CVE-2019-9516, CVE-2019-9517
Mitre: CVE-2019-9511, CVE-2019-9516, CVE-2019-9517
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Amazon Linux | 2 | aarch64 | mod_http2 | < 1.15.3-2.amzn2 | mod_http2-1.15.3-2.amzn2.aarch64.rpm |
Amazon Linux | 2 | aarch64 | mod_http2-debuginfo | < 1.15.3-2.amzn2 | mod_http2-debuginfo-1.15.3-2.amzn2.aarch64.rpm |
Amazon Linux | 2 | i686 | mod_http2 | < 1.15.3-2.amzn2 | mod_http2-1.15.3-2.amzn2.i686.rpm |
Amazon Linux | 2 | i686 | mod_http2-debuginfo | < 1.15.3-2.amzn2 | mod_http2-debuginfo-1.15.3-2.amzn2.i686.rpm |
Amazon Linux | 2 | x86_64 | mod_http2 | < 1.15.3-2.amzn2 | mod_http2-1.15.3-2.amzn2.x86_64.rpm |
Amazon Linux | 2 | x86_64 | mod_http2-debuginfo | < 1.15.3-2.amzn2 | mod_http2-debuginfo-1.15.3-2.amzn2.x86_64.rpm |
7.8 High
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
7.5 High
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
7.7 High
AI Score
Confidence
High
0.097 Low
EPSS
Percentile
94.8%