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             AUSCERT External Security Bulletin Redistribution

                    ESB-2009.0017 -- [Win][UNIX/Linux]
     New versions of BIND released to correct a security vulnerability
                              8 January 2009

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              BIND
Publisher:            ISC
Operating System:     Windows
                      UNIX variants (UNIX, Linux, OSX)
Impact:               Provide Misleading Information
Access:               Remote/Unauthenticated
CVE Names:            CVE-2009-0025

Ref:                  ESB-2009.0009

Original Bulletin:    
  https://lists.isc.org/pipermail/bind-announce/2009-January/000291.html

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                Internet Systems Consortium Security Advisory.
	  BIND: EVP_VerifyFinal() and DSA_do_verify() return checks.
                              7 January 2009

Versions affected:

	BIND 9.0 (all versions)
	BIND 9.1 (all versions)
	BIND 9.2 (all versions)
	BIND 9.3.0, 9.3.1, 9.3.2, 9.3.3, 9.3.4, 9.3.5, 9.3.6
	BIND 9.4.0, 9.4.1, 9.4.2, 9.4.3
	BIND 9.5.0, 9.5.1
	BIND 9.6.0

Severity: Low.

Description:

	Return values from OpenSSL library functions EVP_VerifyFinal()
	and DSA_do_verify() were not checked properly.

Impact:

	It is theoretically possible to spoof answers returned from
	zones using the DNSKEY algorithms DSA (3) and NSEC3DSA (6).

Workaround:

	BIND 9.3, 9.4, 9.5 and 9.6:
	Disable the affected algorithms in named.conf.  This
	will cause answers from zones signed only with DSA (3)
	and/or NSEC3DSA (6) to be treated as insecure.

	BIND 9.3, 9.4, 9.5:
		disable-algorithms . { DSA; };
	BIND 9.6:
		disable-algorithms . { DSA; NSEC3DSA; };

Fix:

	Upgrade to 9.3.6-P1, 9.4.3-P1, 9.5.1-P1, 9.6.0-P1.

	There are no fixes planned for BIND 9.1 or BIND 9.2, as those
	releases do not implement the current DNSSEC protocol.

	Questions should be addressed to bind9-bugs@isc.org.

CVE:	CVE-2009-0025

	Also see CVE-2008-5077 for the corresponding OpenSSL issue

Acknowledgement:

	Credit: Google Security Team (for the original OpenSSL issue),
	Florian Weimer for spotting that BIND9 was vulnerable.

Revision History:

  2009-01-05	Initial pre-release text

  2009-01-07	Public release with corrected CVE

_______________________________________________
bind-announce mailing list
bind-announce@lists.isc.org
https://lists.isc.org/mailman/listinfo/bind-announce

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