CVE-2010-0097: Input Validation
ISC BIND 9.0.x through 9.3.x, 9.4 before 9.4.3-P5, 9.5 before 9.5.2-P2, 9.6 before 9.6.1-P3, and 9.7.0 beta does not properly validate DNSSEC (1) NSEC and (2) NSEC3 records, which allows remote attackers to add the Authenticated Data (AD) flag to a forged NXDOMAIN response for an existing domain.
Other sources
We received the following advisory from ISC:
Description: There was an error in the DNSSEC NSEC/NSEC3 validation code that could cause bogus NXDOMAIN responses (that is, NXDOMAIN responses for records proven by NSEC or NSEC3 to exist) to be cached as if they had validated correctly, so that future queries to the resolver would return the bogus NXDOMAIN with the AD flag set.
Impact: This problem affects all DNSSEC-validating resolvers. It would be difficult to exploit due to other existing protections against cache poisoning (including transaction ID and source port randomization), but it could impair the ability of DNSSEC to protect against a denial-of-service attack on a secure zone.
Workarounds: None, administrators need to upgrade to one of the versions detailed below.
Active exploits: None known at this time.
Solution: Upgrade BIND to one of the following: 9.4.3-P5, 9.5.2-P2 or 9.6.1-P3. There are no fixes available for BIND versions 9.0 through 9.3, as those releases are at End of Life. Note for BIND 9.7 beta-testers: pre-releases of 9.7.0 are vulnerable. Upcoming releases will include these patches.
— Red Hat
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2010-0097?
CVE-2010-0097 has been rated as high severity due to the potential for remote exploitation.
How do I fix CVE-2010-0097?
To fix CVE-2010-0097, upgrade to a version of ISC BIND that is not vulnerable, such as 9.6.1-P3 or later.
What versions of ISC BIND are affected by CVE-2010-0097?
ISC BIND versions from 9.0.x up to 9.5.2 and several release candidates are affected by CVE-2010-0097.
Can CVE-2010-0097 lead to denial of service attacks?
While CVE-2010-0097 primarily allows for the addition of the AD flag to forged responses, it can facilitate denial of service scenarios indirectly.
What types of attacks could exploit CVE-2010-0097?
CVE-2010-0097 could be exploited to achieve cache poisoning or facilitate man-in-the-middle attacks.