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Category:   Application (Generic)  >   BIND Vendors:   ISC (Internet Software Consortium)
BIND TSIG Authentication Bugs Let Remote Users Bypass Authentication to Transfer or Modify Zone Conetnt
SecurityTracker Alert ID:  1038809
SecurityTracker URL:  http://securitytracker.com/id/1038809
CVE Reference:   CVE-2017-3142, CVE-2017-3143   (Links to External Site)
Updated:  Jul 7 2017
Original Entry Date:  Jun 29 2017
Impact:   Disclosure of user information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 9.4.0 - 9.8.8, 9.9.0 - 9.9.10-P1, 9.10.0 - 9.10.5-P1, 9.11.0 - 9.11.1-P1, 9.9.3-S1 - 9.9.10-S2, 9.10.5-S1 - 9.10.5-S2
Description:   Two vulnerabilities were reported in BIND. A remote user can bypass TSIG authentication to transfer a zone or modify zone contents.

A remote user that can send and receive messages to an authoritative DNS server and with knowledge of a valid TSIG key name can send a specially crafted request packet to bypass TSIG authentication on AXFR requests and transfer the target zone [CVE-2017-3142].

A remote user that can send and receive messages to an authoritative DNS server and with knowledge of a valid TSIG key name can send specially crafted data to bypass TSIG authentication and cause the target server to accept an arbitrary dynamic update to the zone content [CVE-2017-3143].

Systems that rely solely on TSIG keys for access control are affected.

Clement Berthaux from Synacktiv reported these vulnerabilities.

Impact:   A remote user can bypass authentication to transfer a zone or modify zone contents.
Solution:   The vendor has issued a fix (9.9.10-P2, 9.10.5-P2, 9.11.1-P2).

[Editor's note: On July 6, 2017, the vendor reported that the fix for CVE-2017-3142 introduced a regression error, causing interoperability issues with other DNS software in certain cases. A patch is pending.]

The vendor advisories are available at:

https://kb.isc.org/article/AA-01503
https://kb.isc.org/article/AA-01504

Vendor URL:  kb.isc.org/article/AA-01504 (Links to External Site)
Cause:   Authentication error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jun 30 2017 (Ubuntu Issues Fix) BIND TSIG Authentication Bugs Let Remote Users Bypass Authentication to Transfer or Modify Zone Conetnt
Ubuntu has issued a fix for Ubuntu Linux 14.04 LTS, 16.04 LTS, 16.10, and 17.04.
Jul 6 2017 (Red Hat Issues Fix) BIND TSIG Authentication Bugs Let Remote Users Bypass Authentication to Transfer or Modify Zone Conetnt
Red Hat has issued a fix for Red Hat Enterprise Linux 6.
Jul 6 2017 (Red Hat Issues Fix) BIND TSIG Authentication Bugs Let Remote Users Bypass Authentication to Transfer or Modify Zone Conetnt
Red Hat has issued a fix for Red Hat Enterprise Linux 7.
Jul 6 2017 (CentOS Issues Fix) BIND TSIG Authentication Bugs Let Remote Users Bypass Authentication to Transfer or Modify Zone Conetnt
CentOS has issued a fix for CentOS 6.
Jul 6 2017 (CentOS Issues Fix) BIND TSIG Authentication Bugs Let Remote Users Bypass Authentication to Transfer or Modify Zone Conetnt
CentOS has issued a fix for CentOS 7.



 Source Message Contents



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