CVE-2012-1667: Handling of zero length rdata can cause named to terminate unexpectedly
| Author: Cathy Almond Reference Number: AA-00698 Views: 15514 Created: 2012-06-04 08:37 Last Updated: 2012-07-24 00:13
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of DNS resource records where the rdata field is zero length may cause
various issues for the servers handling them.
Posting date: 04 Jun 2012
9.0.x -> 9.6.x, 9.4-ESV->9.4-ESV-R5-P1,
9.6-ESV->9.6-ESV-R7, 9.7.0->9.7.6, 9.8.0->9.8.3,
This problem was uncovered while testing with
experimental DNS record types. It is possible to add records to BIND
with null (zero length) rdata fields.
Processing of these records may lead to unexpected outcomes.
Recursive servers may crash or disclose some portion of memory to the
client. Secondary servers may crash on restart after transferring a
zone containing these records. Master servers may corrupt zone data if
the zone option "auto-dnssec" is set to "maintain". Other unexpected
problems that are not listed here may also be encountered.
This issue primarily affects recursive
nameservers. Authoritative nameservers will only be impacted if an
administrator configures experimental record types with no data. If the
server is configured this way, then secondaries can crash on restart
after transferring that zone. Zone data on the master can become
corrupted if the zone with those records has named configured to manage
the DNSSEC key rotation.
CVSS Score: 8.5
CVSS Equation: (AV:N/AC:L/Au:N/C:P/I:N/A:C)
For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit: http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2&vector=(AV:N/AC:L/Au:N/C:P/I:N/A:C)
Workarounds are under investigation, but none are known at this time.
No known active exploits but a public discussion of
the issue has taken place on a public mailing list.Solution:
Upgrade to BIND version 9.6-ESV-R7-P1, 9.7.6-P1, 9.8.3-P1, or 9.9.1-P1
Acknowledgment: Dan Luther,
Level3 Communications, for finding the issue, Jeffrey A. Spain,
Cincinnati Day School, for replication and testing.
Document Revision History:
1.0 Released to Public 4 June, 2012
1.1 Updated Severity to Critical
1.2 Added German Translation 7 June, 2012
1.3 Added link to FAQ supplemental article in KB
1.4 Added Chinese Translation
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