Amazon Linux AMI update for bind

1) Input validation error

EUVDB-ID: #VU4349

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2016-9147

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause denial of service conditions.

The vulnerability exists due to assertion failure when processing input data. A remote attacker can send a response containing an inconsistency among the DNSSEC-related RRsets, trigger assertion failure and cause denial of service.

Successful exploitation of the vulnerability will result in DoS attack against vulnerable application.

Mitigation

Update the affected packages.

i686:
    bind-chroot-9.8.2-0.47.rc1.52.amzn1.i686
    bind-devel-9.8.2-0.47.rc1.52.amzn1.i686
    bind-sdb-9.8.2-0.47.rc1.52.amzn1.i686
    bind-9.8.2-0.47.rc1.52.amzn1.i686
    bind-libs-9.8.2-0.47.rc1.52.amzn1.i686
    bind-utils-9.8.2-0.47.rc1.52.amzn1.i686
    bind-debuginfo-9.8.2-0.47.rc1.52.amzn1.i686

src:
    bind-9.8.2-0.47.rc1.52.amzn1.src

x86_64:
    bind-devel-9.8.2-0.47.rc1.52.amzn1.x86_64
    bind-9.8.2-0.47.rc1.52.amzn1.x86_64
    bind-debuginfo-9.8.2-0.47.rc1.52.amzn1.x86_64
    bind-libs-9.8.2-0.47.rc1.52.amzn1.x86_64
    bind-sdb-9.8.2-0.47.rc1.52.amzn1.x86_64
    bind-utils-9.8.2-0.47.rc1.52.amzn1.x86_64
    bind-chroot-9.8.2-0.47.rc1.52.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3

• cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:*

External links

https://alas.aws.amazon.com/ALAS-2017-798.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.