CVE-2020-11984: Buffer Overflow

Published Aug 5, 2020
·
Updated

A flaw was found in Apache httpd in versions 2.4.32 to 2.4.46. The uwsgi protocol does not serialize more than 16K of HTTP header leading to resource exhaustion and denial of service. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Other sources

A flaw was found in httpd before version 2.4.46. The uwsgi protocol does not let us serialize more than 16K of HTTP header leading to resource exhaustion and denial of service.

Upstream patch:

http://svn.apache.org/viewvc?view=revision&revision=1880251

— Red Hat

Apache HTTP server 2.4.32 to 2.4.44 modproxyuwsgi info disclosure and possible RCE

Affected Software

41 affected componentsFixes available
redhat/jbcs-httpd24-apr<0:1.6.3-104.jbcs.el6
0:1.6.3-104.jbcs.el6
redhat/jbcs-httpd24-apr-util<0:1.6.1-75.jbcs.el6
0:1.6.1-75.jbcs.el6
redhat/jbcs-httpd24-brotli<0:1.0.6-38.jbcs.el6
0:1.0.6-38.jbcs.el6
redhat/jbcs-httpd24-curl<0:7.64.1-44.jbcs.el6
0:7.64.1-44.jbcs.el6
redhat/jbcs-httpd24-httpd<0:2.4.37-64.jbcs.el6
0:2.4.37-64.jbcs.el6
redhat/jbcs-httpd24-jansson<0:2.11-53.jbcs.el6
0:2.11-53.jbcs.el6
redhat/jbcs-httpd24-nghttp2<0:1.39.2-34.jbcs.el6
0:1.39.2-34.jbcs.el6
redhat/jbcs-httpd24-openssl<1:1.1.1c-32.jbcs.el6
1:1.1.1c-32.jbcs.el6
redhat/jbcs-httpd24-apr<0:1.6.3-104.jbcs.el7
0:1.6.3-104.jbcs.el7
redhat/jbcs-httpd24-apr-util<0:1.6.1-75.jbcs.el7
0:1.6.1-75.jbcs.el7
redhat/jbcs-httpd24-brotli<0:1.0.6-38.jbcs.el7
0:1.0.6-38.jbcs.el7
redhat/jbcs-httpd24-curl<0:7.64.1-44.jbcs.el7
0:7.64.1-44.jbcs.el7
redhat/jbcs-httpd24-httpd<0:2.4.37-64.jbcs.el7
0:2.4.37-64.jbcs.el7
redhat/jbcs-httpd24-jansson<0:2.11-53.jbcs.el7
0:2.11-53.jbcs.el7
redhat/jbcs-httpd24-nghttp2<0:1.39.2-34.jbcs.el7
0:1.39.2-34.jbcs.el7
redhat/jbcs-httpd24-openssl<1:1.1.1c-32.jbcs.el7
1:1.1.1c-32.jbcs.el7
redhat/jbcs-httpd24-openssl-chil<0:1.0.0-1.jbcs.el7
0:1.0.0-1.jbcs.el7
redhat/httpd24-httpd<0:2.4.34-22.el7
0:2.4.34-22.el7
Apache HTTP Server>=2.4.32<=2.4.43
NetApp Clustered Data ONTAP
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=20.04
Debian Debian Linux=9.0
Debian Debian Linux=10.0
Fedoraproject Fedora=31
Fedoraproject Fedora=32
openSUSE Leap=15.1
openSUSE Leap=15.2
Oracle Communications Element Manager>=8.2.0<=8.2.2
Oracle Communications Session Report Manager>=8.2.0<=8.2.2
Oracle Communications Session Route Manager>=8.2.0<=8.2.2
Oracle Enterprise Manager Ops Center=12.4.0.0
Oracle Hyperion Infrastructure Technology=11.1.2.4
Oracle Instantis Enterprisetrack=17.1
Oracle Instantis Enterprisetrack=17.2
Oracle Instantis Enterprisetrack=17.3
Oracle ZFS Storage Appliance Kit=8.8
redhat/httpd<2.4.44
2.4.44
debian/apache2
2.4.62-1~deb11u12.4.67-1~deb11u32.4.68-1~deb12u12.4.67-1~deb12u32.4.68-1~deb13u12.4.67-1~deb13u32.4.68-1
debian/uwsgi<=2.0.19.1-7.1, <=2.0.21-5.1, <=2.0.28-9, <=2.0.31-6

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/jbcs-httpd24-apr to a version that resolves this vulnerability.

    Fixed in 0:1.6.3-104.jbcs.el6
  2. Upgrade

    Upgrade redhat/jbcs-httpd24-apr-util to a version that resolves this vulnerability.

    Fixed in 0:1.6.1-75.jbcs.el6
  3. Upgrade

    Upgrade redhat/jbcs-httpd24-brotli to a version that resolves this vulnerability.

    Fixed in 0:1.0.6-38.jbcs.el6
  4. Upgrade

    Upgrade redhat/jbcs-httpd24-curl to a version that resolves this vulnerability.

    Fixed in 0:7.64.1-44.jbcs.el6
  5. Upgrade

    Upgrade redhat/jbcs-httpd24-httpd to a version that resolves this vulnerability.

    Fixed in 0:2.4.37-64.jbcs.el6
  6. Upgrade

    Upgrade redhat/jbcs-httpd24-jansson to a version that resolves this vulnerability.

    Fixed in 0:2.11-53.jbcs.el6
  7. Upgrade

    Upgrade redhat/jbcs-httpd24-nghttp2 to a version that resolves this vulnerability.

    Fixed in 0:1.39.2-34.jbcs.el6
  8. Upgrade

    Upgrade redhat/jbcs-httpd24-openssl to a version that resolves this vulnerability.

    Fixed in 1:1.1.1c-32.jbcs.el6
  9. Upgrade

    Upgrade redhat/jbcs-httpd24-apr to a version that resolves this vulnerability.

    Fixed in 0:1.6.3-104.jbcs.el7
  10. Upgrade

    Upgrade redhat/jbcs-httpd24-apr-util to a version that resolves this vulnerability.

    Fixed in 0:1.6.1-75.jbcs.el7
  11. Upgrade

    Upgrade redhat/jbcs-httpd24-brotli to a version that resolves this vulnerability.

    Fixed in 0:1.0.6-38.jbcs.el7
  12. Upgrade

    Upgrade redhat/jbcs-httpd24-curl to a version that resolves this vulnerability.

    Fixed in 0:7.64.1-44.jbcs.el7
  13. Upgrade

    Upgrade redhat/jbcs-httpd24-httpd to a version that resolves this vulnerability.

    Fixed in 0:2.4.37-64.jbcs.el7
  14. Upgrade

    Upgrade redhat/jbcs-httpd24-jansson to a version that resolves this vulnerability.

    Fixed in 0:2.11-53.jbcs.el7
  15. Upgrade

    Upgrade redhat/jbcs-httpd24-nghttp2 to a version that resolves this vulnerability.

    Fixed in 0:1.39.2-34.jbcs.el7
  16. Upgrade

    Upgrade redhat/jbcs-httpd24-openssl to a version that resolves this vulnerability.

    Fixed in 1:1.1.1c-32.jbcs.el7
  17. Upgrade

    Upgrade redhat/jbcs-httpd24-openssl-chil to a version that resolves this vulnerability.

    Fixed in 0:1.0.0-1.jbcs.el7
  18. Upgrade

    Upgrade redhat/httpd24-httpd to a version that resolves this vulnerability.

    Fixed in 0:2.4.34-22.el7
  19. Upgrade

    Upgrade redhat/httpd to a version that resolves this vulnerability.

    Fixed in 2.4.44
  20. Upgrade

    Upgrade debian/apache2 to a version that resolves this vulnerability.

    Fixed in 2.4.62-1~deb11u1Fixed in 2.4.67-1~deb11u3Fixed in 2.4.68-1~deb12u1Fixed in 2.4.67-1~deb12u3Fixed in 2.4.68-1~deb13u1Fixed in 2.4.67-1~deb13u3Fixed in 2.4.68-1
  21. Configuration

    To disable the vulnerable module, comment out the line "LoadModule proxy_uwsgi_module modules/mod_proxy_uwsgi.so" in /etc/httpd/conf.modules.d/00-proxy.conf. This will disable loading of mod_proxy_uwsgi (the flaw only affects configurations that use the uwsgi protocol).

    Apache httpd (mod_proxy_uwsgi) LoadModule proxy_uwsgi_module modules/mod_proxy_uwsgi.so (in /etc/httpd/conf.modules.d/00-proxy.conf) = comment out

Event History

Aug 5, 2020
Data Sourced
via Red Hat·10:07 PM
DescriptionSeverityAffected Software
Aug 7, 2020
CVE Published
12:00 AM
CVE Published
via MITRE·03:27 PM
Data Sourced
via MITRE·03:27 PM
DescriptionWeakness
Data Sourced
via NVD·04:15 PM
DescriptionSeverityWeaknessAffected Software
Feb 24, 2026
Data Sourced
via Ubuntu·06:48 PM
RemedyDescriptionSeverityAffected Software
Data Sourced
via Launchpad·06:49 PM
Description
Jul 17, 2026
Data Sourced
via Debian·11:40 AM
DescriptionAffected Software

Parent advisories

This vulnerability appears in the following advisories.

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Frequently Asked Questions

1

What is CVE-2020-11984?

CVE-2020-11984 is a vulnerability found in Apache HTTP server versions 2.4.32 to 2.4.44.

2

What is the severity of CVE-2020-11984?

The severity of CVE-2020-11984 is critical.

3

How does CVE-2020-11984 impact data confidentiality and integrity?

CVE-2020-11984 can lead to data confidentiality and integrity issues.

4

How do I fix CVE-2020-11984?

To fix CVE-2020-11984, upgrade Apache HTTP server to version 2.4.44 or higher.

5

Where can I find more information about CVE-2020-11984?

You can find more information about CVE-2020-11984 in the references provided: http://svn.apache.org/viewvc?view=revision&revision=1880251, https://access.redhat.com/support/policy/updates/jboss_notes, https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1868148.

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