Onderwerp: Bind/named : remote crash - zowel Authoritive als resolver - actief misbruik

Dit is zeer urgent voor bind (named) gebruikers :

Aan malicious query kan het bind proces doen crashen.
Dit geldt zowel voor bind in de rol van authoritive DNS, en ook de rol van resolver.

Dit lek wordt actief misbruikt.
Geen workarounds

ISC advisory :

https://kb.isc.org/article/AA-01015

quoted:

BIND
Versions affected:
Open source: 9.7.0->9.7.7, 9.8.0->9.8.5-P1, 9.9.0->9.9.3-P1, 9.8.6b1 and 9.9.4b1; Subscription: 9.9.3-S1 and 9.9.4-S1b1
Severity:
Critical
Exploitable:
Remotely

Description:

A specially crafted query that includes malformed rdata can cause named to terminate with an assertion failure while rejecting the malformed query.

BIND 9.6 and BIND 9.6-ESV are unaffected by this problem. Earlier branches of BIND 9 are believed to be unaffected but have not been tested. BIND 10 is also unaffected by this issue.

Please Note: All versions of BIND 9.7 are known to be affected, but these branches are beyond their "end of life" (EOL) and no longer receive testing or security fixes from ISC. For current information on which versions are actively supported, please see http://www.isc.org/downloads/softwar...ftware-status/.

Impact:

Authoritative and recursive servers are equally vulnerable. Intentional exploitation of this condition can cause a denial of service in all nameservers running affected versions of BIND 9. Access Control Lists do not provide any protection from malicious clients.

In addition to the named server, applications built using libraries from the affected source distributions may crash with assertion failures triggered in the same fashion.

[..]

Workarounds:

No known workarounds at this time.

Active exploits:

Crashes have been reported by multiple ISC customers. First observed in the wild on 26 July 2013.

Solution: Upgrade to the patched release most closely related to your current version of BIND. Open source versions can all be downloaded from http://www.isc.org/downloads. Subscription version customers will be contacted directly by ISC Support regarding delivery.

BIND 9 version 9.8.5-P2
BIND 9 version 9.9.3-P2
BIND 9 version 9.9.3-S1-P1 (Subscription version available via DNSco)

ge-update naar 9.9.3-P2, bedankt voor het melden!