CVE-2020-27782
First published: Tue Nov 24 2020(Updated: )
A flaw was found in the Undertow AJP connector. Malicious requests and abrupt connection closes could be triggered by an attacker using query strings with non-RFC compliant characters resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/eap7-activemq-artemis | <0:2.9.0-7.redhat_00017.1.el6ea | 0:2.9.0-7.redhat_00017.1.el6ea |
| redhat/eap7-glassfish-jsf | <0:2.3.9-12.SP13_redhat_00001.1.el6ea | 0:2.3.9-12.SP13_redhat_00001.1.el6ea |
| redhat/eap7-hal-console | <0:3.2.12-1.Final_redhat_00001.1.el6ea | 0:3.2.12-1.Final_redhat_00001.1.el6ea |
| redhat/eap7-hibernate | <0:5.3.20-1.Final_redhat_00001.1.el6ea | 0:5.3.20-1.Final_redhat_00001.1.el6ea |
| redhat/eap7-httpcomponents-client | <0:4.5.13-1.redhat_00001.1.el6ea | 0:4.5.13-1.redhat_00001.1.el6ea |
| redhat/eap7-jboss-ejb-client | <0:4.0.37-1.Final_redhat_00001.1.el6ea | 0:4.0.37-1.Final_redhat_00001.1.el6ea |
| redhat/eap7-jboss-genericjms | <0:2.0.8-1.Final_redhat_00001.1.el6ea | 0:2.0.8-1.Final_redhat_00001.1.el6ea |
| redhat/eap7-jboss-modules | <0:1.11.0-1.Final_redhat_00001.1.el6ea | 0:1.11.0-1.Final_redhat_00001.1.el6ea |
| redhat/eap7-jboss-remoting | <0:5.0.20-1.Final_redhat_00001.1.el6ea | 0:5.0.20-1.Final_redhat_00001.1.el6ea |
| redhat/eap7-jboss-server-migration | <0:1.7.2-4.Final_redhat_00005.1.el6ea | 0:1.7.2-4.Final_redhat_00005.1.el6ea |
| redhat/eap7-jboss-xnio-base | <0:3.7.12-1.Final_redhat_00001.1.el6ea | 0:3.7.12-1.Final_redhat_00001.1.el6ea |
| redhat/eap7-narayana | <0:5.9.10-1.Final_redhat_00001.1.el6ea | 0:5.9.10-1.Final_redhat_00001.1.el6ea |
| redhat/eap7-opentracing-interceptors | <0:0.0.4.1-2.redhat_00002.1.el6ea | 0:0.0.4.1-2.redhat_00002.1.el6ea |
| redhat/eap7-resteasy | <0:3.11.3-1.Final_redhat_00001.1.el6ea | 0:3.11.3-1.Final_redhat_00001.1.el6ea |
| redhat/eap7-undertow | <0:2.0.33-1.SP2_redhat_00001.1.el6ea | 0:2.0.33-1.SP2_redhat_00001.1.el6ea |
| redhat/eap7-wildfly | <0:7.3.5-2.GA_redhat_00001.1.el6ea | 0:7.3.5-2.GA_redhat_00001.1.el6ea |
| redhat/eap7-wildfly-discovery | <0:1.2.1-1.Final_redhat_00001.1.el6ea | 0:1.2.1-1.Final_redhat_00001.1.el6ea |
| redhat/eap7-wildfly-elytron | <0:1.10.10-1.Final_redhat_00001.1.el6ea | 0:1.10.10-1.Final_redhat_00001.1.el6ea |
| redhat/eap7-wildfly-http-client | <0:1.0.24-1.Final_redhat_00001.1.el6ea | 0:1.0.24-1.Final_redhat_00001.1.el6ea |
| redhat/eap7-activemq-artemis | <0:2.9.0-7.redhat_00017.1.el7ea | 0:2.9.0-7.redhat_00017.1.el7ea |
| redhat/eap7-glassfish-jsf | <0:2.3.9-12.SP13_redhat_00001.1.el7ea | 0:2.3.9-12.SP13_redhat_00001.1.el7ea |
| redhat/eap7-hal-console | <0:3.2.12-1.Final_redhat_00001.1.el7ea | 0:3.2.12-1.Final_redhat_00001.1.el7ea |
| redhat/eap7-hibernate | <0:5.3.20-1.Final_redhat_00001.1.el7ea | 0:5.3.20-1.Final_redhat_00001.1.el7ea |
| redhat/eap7-httpcomponents-client | <0:4.5.13-1.redhat_00001.1.el7ea | 0:4.5.13-1.redhat_00001.1.el7ea |
| redhat/eap7-jboss-ejb-client | <0:4.0.37-1.Final_redhat_00001.1.el7ea | 0:4.0.37-1.Final_redhat_00001.1.el7ea |
| redhat/eap7-jboss-genericjms | <0:2.0.8-1.Final_redhat_00001.1.el7ea | 0:2.0.8-1.Final_redhat_00001.1.el7ea |
| redhat/eap7-jboss-modules | <0:1.11.0-1.Final_redhat_00001.1.el7ea | 0:1.11.0-1.Final_redhat_00001.1.el7ea |
| redhat/eap7-jboss-remoting | <0:5.0.20-1.Final_redhat_00001.1.el7ea | 0:5.0.20-1.Final_redhat_00001.1.el7ea |
| redhat/eap7-jboss-server-migration | <0:1.7.2-4.Final_redhat_00005.1.el7ea | 0:1.7.2-4.Final_redhat_00005.1.el7ea |
| redhat/eap7-jboss-xnio-base | <0:3.7.12-1.Final_redhat_00001.1.el7ea | 0:3.7.12-1.Final_redhat_00001.1.el7ea |
| redhat/eap7-narayana | <0:5.9.10-1.Final_redhat_00001.1.el7ea | 0:5.9.10-1.Final_redhat_00001.1.el7ea |
| redhat/eap7-opentracing-interceptors | <0:0.0.4.1-2.redhat_00002.1.el7ea | 0:0.0.4.1-2.redhat_00002.1.el7ea |
| redhat/eap7-resteasy | <0:3.11.3-1.Final_redhat_00001.1.el7ea | 0:3.11.3-1.Final_redhat_00001.1.el7ea |
| redhat/eap7-undertow | <0:2.0.33-1.SP2_redhat_00001.1.el7ea | 0:2.0.33-1.SP2_redhat_00001.1.el7ea |
| redhat/eap7-wildfly | <0:7.3.5-2.GA_redhat_00001.1.el7ea | 0:7.3.5-2.GA_redhat_00001.1.el7ea |
| redhat/eap7-wildfly-discovery | <0:1.2.1-1.Final_redhat_00001.1.el7ea | 0:1.2.1-1.Final_redhat_00001.1.el7ea |
| redhat/eap7-wildfly-elytron | <0:1.10.10-1.Final_redhat_00001.1.el7ea | 0:1.10.10-1.Final_redhat_00001.1.el7ea |
| redhat/eap7-wildfly-http-client | <0:1.0.24-1.Final_redhat_00001.1.el7ea | 0:1.0.24-1.Final_redhat_00001.1.el7ea |
| redhat/eap7-activemq-artemis | <0:2.9.0-7.redhat_00017.1.el8ea | 0:2.9.0-7.redhat_00017.1.el8ea |
| redhat/eap7-glassfish-jsf | <0:2.3.9-12.SP13_redhat_00001.1.el8ea | 0:2.3.9-12.SP13_redhat_00001.1.el8ea |
| redhat/eap7-hal-console | <0:3.2.12-1.Final_redhat_00001.1.el8ea | 0:3.2.12-1.Final_redhat_00001.1.el8ea |
| redhat/eap7-hibernate | <0:5.3.20-1.Final_redhat_00001.1.el8ea | 0:5.3.20-1.Final_redhat_00001.1.el8ea |
| redhat/eap7-httpcomponents-client | <0:4.5.13-1.redhat_00001.1.el8ea | 0:4.5.13-1.redhat_00001.1.el8ea |
| redhat/eap7-jboss-ejb-client | <0:4.0.37-1.Final_redhat_00001.1.el8ea | 0:4.0.37-1.Final_redhat_00001.1.el8ea |
| redhat/eap7-jboss-genericjms | <0:2.0.8-1.Final_redhat_00001.1.el8ea | 0:2.0.8-1.Final_redhat_00001.1.el8ea |
| redhat/eap7-jboss-modules | <0:1.11.0-1.Final_redhat_00001.1.el8ea | 0:1.11.0-1.Final_redhat_00001.1.el8ea |
| redhat/eap7-jboss-remoting | <0:5.0.20-1.Final_redhat_00001.1.el8ea | 0:5.0.20-1.Final_redhat_00001.1.el8ea |
| redhat/eap7-jboss-server-migration | <0:1.7.2-4.Final_redhat_00005.1.el8ea | 0:1.7.2-4.Final_redhat_00005.1.el8ea |
| redhat/eap7-jboss-xnio-base | <0:3.7.12-1.Final_redhat_00001.1.el8ea | 0:3.7.12-1.Final_redhat_00001.1.el8ea |
| redhat/eap7-narayana | <0:5.9.10-1.Final_redhat_00001.1.el8ea | 0:5.9.10-1.Final_redhat_00001.1.el8ea |
| redhat/eap7-opentracing-interceptors | <0:0.0.4.1-2.redhat_00002.1.el8ea | 0:0.0.4.1-2.redhat_00002.1.el8ea |
| redhat/eap7-resteasy | <0:3.11.3-1.Final_redhat_00001.1.el8ea | 0:3.11.3-1.Final_redhat_00001.1.el8ea |
| redhat/eap7-undertow | <0:2.0.33-1.SP2_redhat_00001.1.el8ea | 0:2.0.33-1.SP2_redhat_00001.1.el8ea |
| redhat/eap7-wildfly | <0:7.3.5-2.GA_redhat_00001.1.el8ea | 0:7.3.5-2.GA_redhat_00001.1.el8ea |
| redhat/eap7-wildfly-discovery | <0:1.2.1-1.Final_redhat_00001.1.el8ea | 0:1.2.1-1.Final_redhat_00001.1.el8ea |
| redhat/eap7-wildfly-elytron | <0:1.10.10-1.Final_redhat_00001.1.el8ea | 0:1.10.10-1.Final_redhat_00001.1.el8ea |
| redhat/eap7-wildfly-http-client | <0:1.0.24-1.Final_redhat_00001.1.el8ea | 0:1.0.24-1.Final_redhat_00001.1.el8ea |
| redhat/Undertow | <2.1.5. | 2.1.5. |
| redhat/Undertow | <2.0.33. | 2.0.33. |
| redhat/Undertow | <2.2.3. | 2.2.3. |
| Red Hat JBoss Fuse | =6.0.0 | |
| Red Hat JBoss Fuse | =7.0.0 | |
| Red Hat OpenShift Application Runtimes | ||
| Red Hat Undertow | =2.0.33-sp2 | |
| Red Hat Undertow | =2.1.5-sp1 | |
| Red Hat Undertow | =2.2.3-sp1 |
Remedy
The issue can be mitigated by using HTTP/1.1 instead of AJP to proxy to the back-end.
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1901304
- https://github.com/apache/httpd/blob/trunk/modules/proxy/ajp_header.c#L327
- https://github.com/apache/tomcat-connectors/blob/master/native/apache-2.0/mod_jk.c#L969
- https://issues.redhat.com/browse/JBCS-1019
- https://access.redhat.com/errata/RHSA-2021:0250
- https://access.redhat.com/errata/RHSA-2021:0246
- https://access.redhat.com/errata/RHSA-2021:0247
- https://access.redhat.com/errata/RHSA-2021:0248
- https://access.redhat.com/security/cve/cve-2020-27782
- https://access.redhat.com/errata/RHSA-2021:0327
- https://access.redhat.com/errata/RHSA-2021:0295
- https://access.redhat.com/errata/RHSA-2021:3205
- https://access.redhat.com/errata/RHSA-2021:3207
- https://access.redhat.com/errata/RHSA-2021:3425
- https://access.redhat.com/errata/RHSA-2021:5134
- https://www.cve.org/CVERecord?id=CVE-2020-27782 https://nvd.nist.gov/vuln/detail/CVE-2020-27782
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is the severity of CVE-2020-27782?
The severity of CVE-2020-27782 is high, primarily impacting system availability.
How do I fix CVE-2020-27782?
To fix CVE-2020-27782, upgrade to the remedied versions of affected packages provided by Red Hat.
Which software is affected by CVE-2020-27782?
CVE-2020-27782 affects various Red Hat packages including undertow, jboss modules, and wildfly components.
Who is impacted by CVE-2020-27782?
Organizations using the affected Red Hat software in their applications are at risk of denial of service due to CVE-2020-27782.
What exploit can be carried out using CVE-2020-27782?
An attacker can exploit CVE-2020-27782 by sending malicious requests with non-RFC compliant characters, leading to potential denial of service.
- collector/redhat-cve
- agent/type
- agent/first-publish-date
- agent/references
- agent/remedy
- agent/severity
- agent/weakness
- agent/author
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2020-27782
- agent/software-canonical-lookup
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/description
- agent/event
- agent/trending
- agent/source
- agent/softwarecombine
- agent/tags
- collector/nvd-index
- agent/software-canonical-lookup-request
- package-manager/redhat
- vendor/redhat
- canonical/red hat jboss fuse
- version/red hat jboss fuse/6.0.0
- version/red hat jboss fuse/7.0.0
- canonical/red hat openshift application runtimes
- canonical/red hat undertow
- version/red hat undertow/2.0.33-sp2
- version/red hat undertow/2.1.5-sp1
- version/red hat undertow/2.2.3-sp1