1. The default access control lists (acls) are not being
correctly set. If not set anyone can make recursive queries
and/or query the cache contents.
See also:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-2925
2. The DNS query id generation is vulnerable to cryptographic
analysis which provides a 1 in 8 chance of guessing the next
query id for 50% of the query ids. This can be used to perform
cache poisoning by an attacker.
This bug only affects outgoing queries, generated by BIND 9 to
answer questions as a resolver, or when it is looking up data
for internal uses, such as when sending NOTIFYs to slave name
servers.
All users are encouraged to upgrade.
See also:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-2926
Approved by: re (kensmith, implicit)
announced by ISC dated 31 October (delivered via e-mail to the
bind-announce@isc.org list on 2 November):
Description:
Because of OpenSSL's recently announced vulnerabilities
(CAN-2006-4339, CVE-2006-2937 and CVE-2006-2940) which affect named,
we are announcing this workaround and releasing patches. A proof of
concept attack on OpenSSL has been demonstrated for CAN-2006-4339.
OpenSSL is required to use DNSSEC with BIND.
Fix for version 9.3.2-P1 and lower:
Upgrade to BIND 9.3.2-P2, then generate new RSASHA1 and
RSAMD5 keys for all old keys using the old default exponent
and perform a key rollover to these new keys.
These versions also change the default RSA exponent to be
65537 which is not vulnerable to the attacks described in
CAN-2006-4339.
