Unbound NSEC3 denial of service
|unbound-nsec3-dos (71868)||Medium Risk|
Unbound is vulnerable to a denial of service, caused by an error when processing responses for NSEC3-signed zones. By sending a specially-crafted response, a remote attacker could exploit this vulnerability to cause an assertion error.
Denial of Service
Upgrade to the latest version of Unbound (1.4.13p2 and 1.4.14 or later), available from the Unbound Web site. See References.
- Unbound Web Site: Unbound denial of service vulnerabilities from nonstandard redirection and denial of existence .
- BID-51115: Unbound Multiple Denial of Service Vulnerabilities
- CVE-2011-4528: Unbound before 1.4.13p2 attempts to free unallocated memory during processing of duplicate CNAME records in a signed zone, which allows remote DNS servers to cause a denial of service (daemon crash) via a crafted response.
- CVE-2011-4869: validator/val_nsec3.c in Unbound before 1.4.13p2 does not properly perform proof processing for NSEC3-signed zones, which allows remote DNS servers to cause a denial of service (daemon crash) via a malformed response that lacks expected NSEC3 records, a different vulnerability than CVE-2011-4528.
- DSA-2370: unbound -- several vulnerabilities
- OSVDB ID: 77909: Unbound Duplicate Resource Record Parsing Remote DoS
- OSVDB ID: 77910: Unbound NSEC3-Signed Zones Response Parsing Remote DoS
- SA47220: Unbound Two Denial of Service Vulnerabilities
- US-CERT VU#209659: Unbound multiple denial-of-service vulnerabilities
- Unbound Unbound 1.3.3
- Unbound Unbound 1.3.4
- Unbound Unbound 1.4.10
- Unbound Unbound 1.4.2
- Unbound Unbound 1.4.3
- Unbound Unbound 1.4.9
Dec 19, 2011
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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.