A denial of service flaw was found in OpenSSL 0.9.8, 1.0.1, 1.0.2 through 1.0.2h, and 1.1.0 in the way the TLS/SSL protocol defined processing of ALERT packets during a connection handshake. A remote attacker could use this flaw to make a TLS/SSL server consume an excessive amount of CPU and fail to accept connections from other clients.
The product does not properly control the allocation and maintenance of a limited resource.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Openssl | Openssl | 1.0.2 (including) | 1.0.2h (including) |
| Openssl | Openssl | 0.9.8 (including) | 0.9.8 (including) |
| Openssl | Openssl | 1.0.1 (including) | 1.0.1 (including) |
| Openssl | Openssl | 1.1.0 (including) | 1.1.0 (including) |
| JBoss Core Services on RHEL 6 | RedHat | jbcs-httpd24-httpd-0:2.4.23-120.jbcs.el6 | * |
| JBoss Core Services on RHEL 6 | RedHat | jbcs-httpd24-mod_security-0:2.9.1-19.GA.jbcs.el6 | * |
| JBoss Core Services on RHEL 6 | RedHat | jbcs-httpd24-openssl-1:1.0.2h-13.jbcs.el6 | * |
| JBoss Core Services on RHEL 7 | RedHat | jbcs-httpd24-httpd-0:2.4.23-120.jbcs.el7 | * |
| JBoss Core Services on RHEL 7 | RedHat | jbcs-httpd24-mod_security-0:2.9.1-19.GA.jbcs.el7 | * |
| JBoss Core Services on RHEL 7 | RedHat | jbcs-httpd24-openssl-1:1.0.2h-13.jbcs.el7 | * |
| Red Hat Enterprise Linux 6 | RedHat | openssl-0:1.0.1e-48.el6_8.4 | * |
| Red Hat Enterprise Linux 6 | RedHat | gnutls-0:2.12.23-21.el6 | * |
| Red Hat Enterprise Linux 7 | RedHat | openssl-1:1.0.1e-60.el7_3.1 | * |
| Red Hat JBoss Enterprise Application Platform 6.4 | RedHat | openssl | * |
| Red Hat JBoss Enterprise Application Platform 6.4 for RHEL 6 | RedHat | jbcs-httpd24-openssl-1:1.0.2h-13.jbcs.el6 | * |
| Red Hat JBoss Enterprise Application Platform 6.4 for RHEL 7 | RedHat | jbcs-httpd24-openssl-1:1.0.2h-13.jbcs.el7 | * |
| Red Hat JBoss Enterprise Web Server 2 for RHEL 6 | RedHat | jbcs-httpd24-openssl-1:1.0.2h-13.jbcs.el6 | * |
| Red Hat JBoss Enterprise Web Server 2 for RHEL 6 | RedHat | tomcat6-0:6.0.41-17_patch_04.ep6.el6 | * |
| Red Hat JBoss Enterprise Web Server 2 for RHEL 6 | RedHat | tomcat7-0:7.0.54-25_patch_05.ep6.el6 | * |
| Red Hat JBoss Enterprise Web Server 2 for RHEL 7 | RedHat | jbcs-httpd24-openssl-1:1.0.2h-13.jbcs.el7 | * |
| Red Hat JBoss Enterprise Web Server 2 for RHEL 7 | RedHat | tomcat6-0:6.0.41-17_patch_04.ep6.el7 | * |
| Red Hat JBoss Enterprise Web Server 2 for RHEL 7 | RedHat | tomcat7-0:7.0.54-25_patch_05.ep6.el7 | * |
| Red Hat JBoss Web Server 2.1 | RedHat | openssl | * |
| Red Hat JBoss Web Server 3.1 | RedHat | * | |
| Red Hat JBoss Web Server 3 for RHEL 6 | RedHat | log4j-eap6-0:1.2.16-12.redhat_3.1.ep6.el6 | * |
| Red Hat JBoss Web Server 3 for RHEL 6 | RedHat | tomcat7-0:7.0.70-22.ep7.el6 | * |
| Red Hat JBoss Web Server 3 for RHEL 6 | RedHat | tomcat8-0:8.0.36-24.ep7.el6 | * |
| Red Hat JBoss Web Server 3 for RHEL 6 | RedHat | tomcat-native-0:1.2.8-10.redhat_10.ep7.el6 | * |
| Red Hat JBoss Web Server 3 for RHEL 7 | RedHat | log4j-eap6-0:1.2.16-12.redhat_3.1.ep6.el7 | * |
| Red Hat JBoss Web Server 3 for RHEL 7 | RedHat | tomcat7-0:7.0.70-22.ep7.el7 | * |
| Red Hat JBoss Web Server 3 for RHEL 7 | RedHat | tomcat8-0:8.0.36-24.ep7.el7 | * |
| Red Hat JBoss Web Server 3 for RHEL 7 | RedHat | tomcat-native-0:1.2.8-10.redhat_10.ep7.el7 | * |
| Text-Only JBCS | RedHat | * | |
| Gnutls26 | Ubuntu | esm-infra-legacy/trusty | * |
| Gnutls26 | Ubuntu | precise | * |
| Gnutls26 | Ubuntu | trusty | * |
| Gnutls26 | Ubuntu | trusty/esm | * |
| Gnutls28 | Ubuntu | esm-infra/xenial | * |
| Gnutls28 | Ubuntu | precise | * |
| Gnutls28 | Ubuntu | trusty | * |
| Gnutls28 | Ubuntu | vivid/stable-phone-overlay | * |
| Gnutls28 | Ubuntu | vivid/ubuntu-core | * |
| Gnutls28 | Ubuntu | xenial | * |
| Gnutls28 | Ubuntu | yakkety | * |
| Openssl | Ubuntu | artful | * |
| Openssl | Ubuntu | bionic | * |
| Openssl | Ubuntu | cosmic | * |
| Openssl | Ubuntu | devel | * |
| Openssl | Ubuntu | disco | * |
| Openssl | Ubuntu | esm-infra-legacy/trusty | * |
| Openssl | Ubuntu | esm-infra/bionic | * |
| Openssl | Ubuntu | esm-infra/xenial | * |
| Openssl | Ubuntu | precise | * |
| Openssl | Ubuntu | trusty | * |
| Openssl | Ubuntu | trusty/esm | * |
| Openssl | Ubuntu | vivid/stable-phone-overlay | * |
| Openssl | Ubuntu | vivid/ubuntu-core | * |
| Openssl | Ubuntu | xenial | * |
| Openssl | Ubuntu | yakkety | * |
| Openssl | Ubuntu | zesty | * |
| Openssl098 | Ubuntu | precise | * |
| Openssl098 | Ubuntu | trusty | * |
Mitigation of resource exhaustion attacks requires that the target system either:
The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.
The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.