Amazon Linux AMI update for bind

1) Assertion failure

EUVDB-ID: #VU14291

Risk: Medium

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-2018-5740

CWE-ID: CWE-617 - Reachable Assertion

Exploit availability: No

Description

The vulnerability allows an attacker to perform denial of service (DoS) attack.

The vulnerability exists due to INSIST assertion failure in name.c when processing recursive queries. A remote attacker can trigger denial of service conditions if the affected server is configured with enabled "deny-answer-aliases" feature.

Mitigation

Update the affected packages.

i686:
    bind-chroot-9.8.2-0.68.rc1.58.amzn1.i686
    bind-utils-9.8.2-0.68.rc1.58.amzn1.i686
    bind-debuginfo-9.8.2-0.68.rc1.58.amzn1.i686
    bind-sdb-9.8.2-0.68.rc1.58.amzn1.i686
    bind-libs-9.8.2-0.68.rc1.58.amzn1.i686
    bind-9.8.2-0.68.rc1.58.amzn1.i686
    bind-devel-9.8.2-0.68.rc1.58.amzn1.i686

src:
    bind-9.8.2-0.68.rc1.58.amzn1.src

x86_64:
    bind-libs-9.8.2-0.68.rc1.58.amzn1.x86_64
    bind-devel-9.8.2-0.68.rc1.58.amzn1.x86_64
    bind-utils-9.8.2-0.68.rc1.58.amzn1.x86_64
    bind-9.8.2-0.68.rc1.58.amzn1.x86_64
    bind-chroot-9.8.2-0.68.rc1.58.amzn1.x86_64
    bind-sdb-9.8.2-0.68.rc1.58.amzn1.x86_64
    bind-debuginfo-9.8.2-0.68.rc1.58.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2018-1082.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.