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Date: Thu, 25 Apr 2019 12:13:37 +0200
From: Peter Korsgaard <>
To: Michael McNally <>
Subject: Re: Multiple BIND vulnerabilities disclosed (CVE-2018-5743, CVE-2019-6467, and CVE-2019-6468)

>>>>> "Michael" == Michael McNally <> writes:

 > Today ISC disclosed two vulnerabilities affecting BIND as well
 > as a third vulnerability which affects *only* BIND Supported Preview
 > Edition (a special feature-preview version of BIND provided to
 > ISC support customers.)

 > Information about the vulnerabilities can be found in the ISC Knowledge
 > Base:

 >    CVE-2018-5743: Limiting simultaneous TCP clients is ineffective

 >    CVE-2019-6467: An error in the nxdomain redirect feature can cause
 >    BIND to exit with an INSIST assertion failure in query.c

 >    CVE-2019-6468: BIND Supported Preview Edition can exit with an
 >    assertion failure if nxdomain-redirect is used

 > New releases of BIND have been issued to fix the vulnerabilities above.
 > They may be downloaded from the ISC website:

 >    -  9.11.6-P1
 >    -  9.12.4-P1
 >    -  9.14.1

It is a bit unfortunate that these security fixes now use
isc_atomic_xadd() which are not available on all architectures:

.libs/client.o: In function `mark_tcp_active':
client.c:(.text+0xc7c): undefined reference to `isc_atomic_xadd'
client.c:(.text+0xca0): undefined reference to `isc_atomic_xadd'
.libs/client.o: In function `client_accept':
client.c:(.text+0x2210): undefined reference to `isc_atomic_xadd'
client.c:(.text+0x230c): undefined reference to `isc_atomic_xadd'
.libs/client.o: In function `exit_check':
client.c:(.text+0x2958): undefined reference to `isc_atomic_xadd'
.libs/client.o:client.c:(.text+0x5cb4): more undefined references to `isc_atomic_xadd' follow
collect2: error: ld returned 1 exit status


Bye, Peter Korsgaard

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