CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
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
AI Score
Confidence
High
EPSS
Percentile
80.3%
Issue Overview:
Apache HTTP Server versions 2.4.20 to 2.4.43. A specially crafted value for the ‘Cache-Digest’ header in a HTTP/2 request would result in a crash when the server actually tries to HTTP/2 PUSH a resource afterwards. Configuring the HTTP/2 feature via “H2Push off” will mitigate this vulnerability for unpatched servers. A flaw was found in Apache httpd in versions prior to 2.4.46. A specially crafted Cache-Digest header triggers negative argument to memmove() that could lead to a crash and denial of service. The highest threat from this vulnerability is to system availability. (CVE-2020-9490)
Apache HTTP Server versions 2.4.20 to 2.4.43 When trace/debug was enabled for the HTTP/2 module and on certain traffic edge patterns, logging statements were made on the wrong connection, causing concurrent use of memory pools. Configuring the LogLevel of mod_http2 above “info” will mitigate this vulnerability for unpatched servers. A flaw was found in Apache httpd in versions 2.4.20 to 2.4.43. Logging using the wrong pool by mod_http2 at debug/trace log level may lead to potential crashes and denial of service. The highest threat from this vulnerability is to system availability. (CVE-2020-11993)
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_http2-1.15.14-2.amzn2.aarch64
mod_http2-debuginfo-1.15.14-2.amzn2.aarch64
i686:
mod_http2-1.15.14-2.amzn2.i686
mod_http2-debuginfo-1.15.14-2.amzn2.i686
src:
mod_http2-1.15.14-2.amzn2.src
x86_64:
mod_http2-1.15.14-2.amzn2.x86_64
mod_http2-debuginfo-1.15.14-2.amzn2.x86_64
Red Hat: CVE-2020-11993, CVE-2020-9490
Mitre: CVE-2020-11993, CVE-2020-9490
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Amazon Linux | 2 | aarch64 | mod_http2 | < 1.15.14-2.amzn2 | mod_http2-1.15.14-2.amzn2.aarch64.rpm |
Amazon Linux | 2 | aarch64 | mod_http2-debuginfo | < 1.15.14-2.amzn2 | mod_http2-debuginfo-1.15.14-2.amzn2.aarch64.rpm |
Amazon Linux | 2 | i686 | mod_http2 | < 1.15.14-2.amzn2 | mod_http2-1.15.14-2.amzn2.i686.rpm |
Amazon Linux | 2 | i686 | mod_http2-debuginfo | < 1.15.14-2.amzn2 | mod_http2-debuginfo-1.15.14-2.amzn2.i686.rpm |
Amazon Linux | 2 | x86_64 | mod_http2 | < 1.15.14-2.amzn2 | mod_http2-1.15.14-2.amzn2.x86_64.rpm |
Amazon Linux | 2 | x86_64 | mod_http2-debuginfo | < 1.15.14-2.amzn2 | mod_http2-debuginfo-1.15.14-2.amzn2.x86_64.rpm |
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
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
AI Score
Confidence
High
EPSS
Percentile
80.3%