Amazon Linux AMI update for bind

Published: 2017-04-27

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2017-3136 CVE-2017-3137
CWE-ID	CWE-617
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Amazon Linux AMI Operating systems & Components / Operating system
Vendor	Amazon Web Services

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Assertion failure

EUVDB-ID: #VU16152

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-3136

CWE-ID: CWE-617 - Reachable Assertion

Exploit availability: No

Description

The vulnerability allows a remote authenticated attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to the servers are configured to use DNS64 and if the option "break-dnssec yes;" is in use. A remote attacker can supply specially crafted queries, if it was configured to use the DNS64 feature and other preconditions were met, trigger a server using DNS64 assertion failure and cause the service to crash.

Mitigation

Update the affected packages:

i686:
    bind-sdb-9.8.2-0.62.rc1.54.amzn1.i686
    bind-9.8.2-0.62.rc1.54.amzn1.i686
    bind-debuginfo-9.8.2-0.62.rc1.54.amzn1.i686
    bind-devel-9.8.2-0.62.rc1.54.amzn1.i686
    bind-utils-9.8.2-0.62.rc1.54.amzn1.i686
    bind-libs-9.8.2-0.62.rc1.54.amzn1.i686
    bind-chroot-9.8.2-0.62.rc1.54.amzn1.i686

src:
    bind-9.8.2-0.62.rc1.54.amzn1.src

x86_64:
    bind-devel-9.8.2-0.62.rc1.54.amzn1.x86_64
    bind-sdb-9.8.2-0.62.rc1.54.amzn1.x86_64
    bind-debuginfo-9.8.2-0.62.rc1.54.amzn1.x86_64
    bind-chroot-9.8.2-0.62.rc1.54.amzn1.x86_64
    bind-utils-9.8.2-0.62.rc1.54.amzn1.x86_64
    bind-libs-9.8.2-0.62.rc1.54.amzn1.x86_64
    bind-9.8.2-0.62.rc1.54.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2017-826.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Assertion failure

EUVDB-ID: #VU7227