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Date: Tue, 24 Apr 2012 12:08:17 -0600
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com
CC: Jan Lieskovsky <jlieskov@...hat.com>,
        "Steven M. Christey" <coley@...us.mitre.org>,
        Adam Tkac <atkac@...hat.com>, Petr Spacek <pspacek@...hat.com>
Subject: Re: CVE Request -- bind-dyndb-ldap: Bind DoS (named
 hang) by processing DNS query for zone served by bind-dyndb-ldap

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On 04/24/2012 10:47 AM, Jan Lieskovsky wrote:
> Note: First time mangled email address of Petr Spacek => apologize
> if you got this email two times. Anyway:
> 
> Hello Kurt, Steve, vendors,
> 
> a denial of service flaw was found in the way the bind-dyndb-ldap,
> a dynamic LDAP back-end plug-in for BIND providing LDAP database
> back-end capabilities, performed LDAP connection errors handling /
> attempted to recover, when an error during a LDAP search happened
> for a particular DNS query. When the Berkeley Internet Name Domain
> (BIND) server was patched to support dynamic loading of database
> back-ends, and the LDAP database back-end was enabled, a remote 
> attacker could use this flaw to cause denial of service (named
> process hang) via DNS query for zone served by bind-dyndb-ldap.
> 
> bind-dyndb-ldap backend upstream commit, which introduced the
> problem: [1] 
> http://git.fedorahosted.org/git/?p=bind-dyndb-ldap.git;a=commit;h=a7a47212beb01c5083768bdd4170250e7f7cf188
>
> 
> 
> Preliminary bind-dyndb-ldap back-end upstream patch from Adam
> Tkac: [2] https://bugzilla.redhat.com/show_bug.cgi?id=815846#c1
> 
> References: [3] https://bugzilla.redhat.com/show_bug.cgi?id=815846 
> [4]
> https://www.redhat.com/archives/freeipa-users/2012-April/msg00145.html
>
>  Note: Just to explicitly note this. This is NOT a bind DoS in the
> sense upstream bind source package would be affected by it. Bind 
> needs to be first patched to support dynamic loading of database 
> backends and it's an error in the LDAP backend (bind-dyndb-ldap 
> source code) which makes this attack to succeed when a 
> specially-crafted DNS query is issued.
> 
> Could you allocate a CVE id for this?
> 
> Thank you && Regards, Jan. -- Jan iankko Lieskovsky / Red Hat
> Security Response Team

Please use CVE-2012-2134 for this issue.

- -- 
Kurt Seifried Red Hat Security Response Team (SRT)
PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993

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