A denial of service flaw was found in the way BIND handled DNSSEC validation. A remote attacker could use this flaw to make named exit unexpectedly with an assertion failure via a specially crafted DNS response.
The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Enterprise_linux_server_aus | Redhat | 6.2 (including) | 6.2 (including) |
| Enterprise_linux_server_aus | Redhat | 6.4 (including) | 6.4 (including) |
| Enterprise_linux_server_aus | Redhat | 6.5 (including) | 6.5 (including) |
| Enterprise_linux_server_aus | Redhat | 6.6 (including) | 6.6 (including) |
| Enterprise_linux_server_eus | Redhat | 6.7 (including) | 6.7 (including) |
| Enterprise_linux_server_tus | Redhat | 6.5 (including) | 6.5 (including) |
| Enterprise_linux_server_tus | Redhat | 6.6 (including) | 6.6 (including) |
| Red Hat Enterprise Linux 6 | RedHat | bind-32:9.8.2-0.62.rc1.el6_9.2 | * |
| Red Hat Enterprise Linux 6.2 Advanced Update Support | RedHat | bind-32:9.7.3-8.P3.el6_2.9 | * |
| Red Hat Enterprise Linux 6.4 Advanced Update Support | RedHat | bind-32:9.8.2-0.17.rc1.el6_4.12 | * |
| Red Hat Enterprise Linux 6.5 Advanced Update Support | RedHat | bind-32:9.8.2-0.23.rc1.el6_5.7 | * |
| Red Hat Enterprise Linux 6.5 Telco Extended Update Support | RedHat | bind-32:9.8.2-0.23.rc1.el6_5.7 | * |
| Red Hat Enterprise Linux 6.6 Advanced Update Support | RedHat | bind-32:9.8.2-0.30.rc1.el6_6.9 | * |
| Red Hat Enterprise Linux 6.6 Telco Extended Update Support | RedHat | bind-32:9.8.2-0.30.rc1.el6_6.9 | * |
| Red Hat Enterprise Linux 6.7 Extended Update Support | RedHat | bind-32:9.8.2-0.37.rc1.el6_7.11 | * |
While assertion is good for catching logic errors and reducing the chances of reaching more serious vulnerability conditions, it can still lead to a denial of service. For example, if a server handles multiple simultaneous connections, and an assert() occurs in one single connection that causes all other connections to be dropped, this is a reachable assertion that leads to a denial of service.