Bug 1762914 (CVE-2019-6475) - CVE-2019-6475 bind: A flaw in mirror zone validity checking can allow zone data to be spoofed
Summary: CVE-2019-6475 bind: A flaw in mirror zone validity checking can allow zone da...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2019-6475
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1762915
Blocks: 1762961
TreeView+ depends on / blocked
 
Reported: 2019-10-17 19:28 UTC by kat
Modified: 2021-02-16 21:13 UTC (History)
10 users (show)

Fixed In Version: bind 9.15.5, bind 9.14.7
Doc Type: If docs needed, set a value
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Clone Of:
Environment:
Last Closed: 2019-10-22 18:51:22 UTC


Attachments (Terms of Use)

Description kat 2019-10-17 19:28:01 UTC
Mirror zones are a BIND feature allowing recursive servers to pre-cache zone data provided by other servers. A mirror zone is similar to a zone of type secondary, except that its data is subject to DNSSEC validation before being used in answers, as if it had been looked up via traditional recursion, and when mirror zone data cannot be validated, BIND falls back to using traditional recursion instead of the mirror zone. However, an error in the validity checks for the incoming zone data can allow an on-path attacker to replace zone data that was validated with a configured trust anchor with forged data of the attacker's choosing.

The mirror zone feature is most often used to serve a local copy of the root zone. If an attacker was able to insert themselves into the network path between a recursive server using a mirror zone and a root name server, this vulnerability could then be used to cause the recursive server to accept a copy of falsified root zone data.

https://kb.isc.org/docs/cve-2019-6475

Comment 1 kat 2019-10-17 19:28:11 UTC
Created bind tracking bugs for this issue:

Affects: fedora-all [bug 1762915]

Comment 2 Tomas Hoger 2019-10-18 12:36:22 UTC
External References:

https://kb.isc.org/docs/cve-2019-6475

Comment 3 Tomas Hoger 2019-10-20 21:13:16 UTC
Upstream commit (9.15 branch):

https://gitlab.isc.org/isc-projects/bind9/commit/b1e2902228f0a60fbf4733535ebe7395173ae55a

Comment 4 Huzaifa S. Sidhpurwala 2019-10-22 05:03:15 UTC
Statement:

This flaw did not affect the versions of bind shipped with Red Hat Enterprise Linux 6, 7 and 8.

Comment 5 Product Security DevOps Team 2019-10-22 18:51:22 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-6475

Comment 6 Michael Kaplan 2020-03-30 09:06:30 UTC
Please comment on RH and NVD CVSS difference.


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