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CERT Coordination Center

ISC BIND 9 resolver cache vulnerability

Vulnerability Note VU#542123

Original Release Date: 2012-02-08 | Last Revised: 2012-07-23


ISC BIND 9 resolver contains a vulnerability that could allow a attacker to keep a domain name in the cache even after it has been deleted from registration.


According to ISC:

ISC has been notified by Haixin Duan (a professor at Tsinghua University in Beijing China, who is currently visiting the International Computer Science Institute (ICSI) at the University of California, Berkeley) about a DNS resolver vulnerability. This vulnerability allows a miscreant to keep a domain name in the cache even after it has been deleted from registration. ISC is evaluating the risk of this vulnerability, but the published paper shows how this was done live across the Internet. It lists several DNS implementations and open resolver deployments as vulnerable.

The exploit was presented at the NDSS conference: "Ghost Domain Names: Revoked Yet Still Resolvable."


A remote, unauthenticated attacker can cause the BIND 9 resolver to keep a domain name in the cache even after it has been deleted from registration.


We are currently unaware of a practical solution to this problem.

Vendor Information


Internet Systems Consortium Affected

Updated:  February 08, 2012



Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

CVSS Metrics

Group Score Vector
Base 5 AV:N/AC:L/Au:N/C:N/I:P/A:N
Temporal 3.9 E:POC/RL:OF/RC:C
Environmental 3.9 CDP:ND/TD:H/CR:ND/IR:ND/AR:ND



The Internet Systems Consortium thanks the following people for reporting this vulnerability:Jian Jiang, Network Research Center, Tsinghua UniversityHaixin Duan, Network Research Center, Tsinghua UniversityJianping Wu, Network Research Center, Tsinghua UniversityKang Li, Department of Computer Science, University of GeorgiaJun Li, University of Oregon Carlos III University of Madrid, Institute IMDEA NetworksJinjin Liang, Network Research Center Tsinghua UniversityNicholas Weaver, International Computer Science Institute (ICSI)

This document was written by Michael Orlando.

Other Information

CVE IDs: CVE-2012-1033
Severity Metric: 19.89
Date Public: 2012-02-07
Date First Published: 2012-02-08
Date Last Updated: 2012-07-23 21:07 UTC
Document Revision: 71

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