Amazon Linux AMI update for bind

1) Denial of service

EUVDB-ID: #VU1132

Risk: Low

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-8864

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote unauthenticated user to cause DoS conditions on the target system.
The weakness is due to imptoper input validation. By returning a recursive response containing a specially crafted DNAME answer, a remote attacker can trigger a flaw in 'db.c' or 'resolver.c' and cause the target resolver to crash.
Successful exploitation of the vulnerability results in denial of service on the vulnerable system.

Mitigation

Update the affected packages.

i686:
    bind-9.8.2-0.47.rc1.51.amzn1.i686
    bind-sdb-9.8.2-0.47.rc1.51.amzn1.i686
    bind-chroot-9.8.2-0.47.rc1.51.amzn1.i686
    bind-debuginfo-9.8.2-0.47.rc1.51.amzn1.i686
    bind-utils-9.8.2-0.47.rc1.51.amzn1.i686
    bind-devel-9.8.2-0.47.rc1.51.amzn1.i686
    bind-libs-9.8.2-0.47.rc1.51.amzn1.i686

src:
    bind-9.8.2-0.47.rc1.51.amzn1.src

x86_64:
    bind-9.8.2-0.47.rc1.51.amzn1.x86_64
    bind-devel-9.8.2-0.47.rc1.51.amzn1.x86_64
    bind-chroot-9.8.2-0.47.rc1.51.amzn1.x86_64
    bind-libs-9.8.2-0.47.rc1.51.amzn1.x86_64
    bind-sdb-9.8.2-0.47.rc1.51.amzn1.x86_64
    bind-debuginfo-9.8.2-0.47.rc1.51.amzn1.x86_64
    bind-utils-9.8.2-0.47.rc1.51.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2016-768.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.