---
title: "CVE-2010-3613: cache incorrectly allows a ncache entry and a rrsig for the same type"
slug: "aa-00938"
description: "Adding certain types of signed negative responses to cache doesn't clear any matching RRSIG records already in cache. A subsequent lookup of the cached data can cause named to crash (INSIST)."
updated: 2018-10-01T18:47:28Z
published: 2018-10-01T18:47:28Z
---

> ## Documentation Index
> Fetch the complete documentation index at: https://kb.isc.org/llms.txt
> Use this file to discover all available pages before exploring further.

# CVE-2010-3613: cache incorrectly allows a ncache entry and a rrsig for the same type

Failure to clear existing RRSIG records when a NO DATA is negatively cached could cause subsequent lookups to crash **named**.

**CVE**: [CVE-2010-3613](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3613)

**CERT**: [VU#706148](https://www.kb.cert.org/vuls/id/706148)

**Posting Date**: 01 Dec 2010

**Program Impacted**: [BIND](https://www.isc.org/software/bind)

**Versions Affected**: 9.0.x to 9.7.2-P2, 9.4-ESV to 9.4-ESV-R3, 9.6-ESV to 9.6-ESV-R2

**Severity**: High

**Exploitable**: Remotely

**Description**

Adding certain types of signed negative responses to cache doesn't clear any matching RRSIG records already in cache. A subsequent lookup of the cached data can cause named to crash (INSIST).

**Impact and Risk Assessment**

The INSIST crashes the server.

This vulnerability affects recursive nameservers irrespective of whether DNSSEC validation is enabled or disabled.

**CVSS Score**: 7.8

**CVSS Equation:** (AV:N/AC:L/Au:N/C:N/I:N/A:C)

For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit: [https://nvd.nist.gov/cvss.cfm?version=2&vector=(AV:N/AC:L/Au:N/C:N/I:N/A:C)](https://nvd.nist.gov/cvss.cfm?version=2&vector=%28AV:N/AC:L/Au:N/C:N/I:N/A:C%29)

**Workarounds**: None.

**Active exploits**: None known at this time.

**Solution**

The versions listed below are supported by ISC. All other versions are End of Life, and will not be patched. If you are running a version not listed below, you should upgrade as soon as possible.

- 9.4.x: upgrade to 9.4-ESV-R4, or newer
- 9.6.x: upgrade to 9.6.2-P3 or newer
- 9.6-ESV: upgrade to 9.6-ESV-R3 or newer
- 9.7.x: upgrade to 9.7.2-P3

**Acknowledgements**: Shinichi Furuso

**Document Revision History**

24 Nov 2010: Corrected/Updated: Versions affected, CVSS Score, Impact and Risk Assessment and Solution 14 Dec 2010: Updated Versions Affected, Solution and Acknowledgement

**Related Documents**

See our [BIND Security Vulnerability Matrix](https://kb.isc.org/docs/aa-00913) for a complete listing of Security Vulnerabilities and versions affected.

**Do you have questions?** Questions regarding this advisory should go to [security-officer@isc.org](mailto:security-officer@isc.org).

**Do you need software support?** Questions on ISC's Support services or other offerings should be sent to [sales@isc.org](mailto:sales@isc.org). More information on ISC's support and other offerings is available at: [https://www.isc.org/bind-subscription-2/](https://www.isc.org/bind-subscription-2/).

**ISC Software Defect and Security Vulnerability Disclosure Policy**: Details of our current security advisory policy and practice can be found in our [Software Defect and Security Vulnerability Disclosure Policy](https://kb.isc.org/docs/aa-00861).

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