A denial of service flaw was found in the way BIND handled query responses when both DNS64 and RPZ were used. A remote attacker could use this flaw to make named exit unexpectedly with an assertion failure or a null pointer dereference via a specially crafted DNS response.
Find out more about CVE-2017-3135 from the MITRE CVE dictionary dictionary and NIST NVD.
| Base Score | 4.3 |
|---|---|
| Base Metrics | AV:N/AC:M/Au:N/C:N/I:N/A:P |
| Access Vector | Network |
| Access Complexity | Medium |
| Authentication | None |
| Confidentiality Impact | None |
| Integrity Impact | None |
| Availability Impact | Partial |
| CVSS3 Base Score | 7.5 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity Impact | None |
| Availability Impact | High |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
| Platform | Errata | Release Date |
|---|---|---|
| Red Hat Enterprise Linux 7 (bind) | RHSA-2017:0276 | 2017-02-15 |
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 6 | bind | Not affected |
| Red Hat Enterprise Linux 5 | bind97 | Not affected |
| Red Hat Enterprise Linux 5 | bind | Not affected |
While it is possible to avoid the condition by removing either DNS64 or RPZ from the configuration, or by carefully restricting the contents of the policy zone, for an affected configuration the most practical and safest course of action is to upgrade to a version of BIND without this vulnerability.
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