8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:P/A:P
0.028 Low
EPSS
Percentile
90.5%
A flaw was found in the way HAProxy processed certain HTTP/2 request packets. This flaw allows an attacker to send crafted HTTP/2 request packets, which cause memory corruption, leading to a crash or potential remote arbitrary code execution with the permissions of the user running HAProxy.
This issue can be mitigated by not enabling support for HTTP/2 protocol. Upstream suggests that HTTP/2 can be enabled per front-end server by using the following documentation: <https://www.haproxy.com/documentation/hapee/1-8r1/traffic-management/enable-http2-protocol/>.
You can check if http2 is enabled by searching your haproxy configuration files for a line containing 'h2'.
To mitigate this vulnerability in OpenShift Container Platform 3.11, keep HTTP/2 disabled as it is by default. You can verify if HTTP/2 support is enabled or not by following the instructions in following article: <https://access.redhat.com/security/vulnerabilities/haproxy>
On Red Hat Enterprise Linux 8, haproxy is confined by SELinux, which should mitigate remote arbitrary code execution.
bugs.chromium.org/p/project-zero/issues/detail?id=2023
bugzilla.redhat.com/show_bug.cgi?id=1819111
nvd.nist.gov/vuln/detail/CVE-2020-11100
www.cve.org/CVERecord?id=CVE-2020-11100
www.haproxy.com/blog/haproxy-1-8-http-2-hpack-decoder-vulnerability-fixed/
www.mail-archive.com/[email protected]/msg36876.html
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:P/A:P
0.028 Low
EPSS
Percentile
90.5%