Amazon Linux AMI update for bind



Published: 2017-07-20
Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2017-3143
CVE-2017-3142
CWE-ID CWE-20
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
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) Security restrictions bypass

EUVDB-ID: #VU7258

Risk: Medium

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

CVE-ID: CVE-2017-3143

CWE-ID: CWE-20 - Improper input validation

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to an error in TSIG authentication of AXFR requests. A remote attacker who is able to send and receive messages to an authoritative DNS server and who has knowledge of a valid TSIG key name can send specially crafted request packet, manipulate the malicious zone content and accept unauthorized dynamic updates.

Mitigation

Update the affected packages.

i686:
    bind-sdb-9.8.2-0.62.rc1.56.amzn1.i686
    bind-libs-9.8.2-0.62.rc1.56.amzn1.i686
    bind-debuginfo-9.8.2-0.62.rc1.56.amzn1.i686
    bind-devel-9.8.2-0.62.rc1.56.amzn1.i686
    bind-utils-9.8.2-0.62.rc1.56.amzn1.i686
    bind-chroot-9.8.2-0.62.rc1.56.amzn1.i686
    bind-9.8.2-0.62.rc1.56.amzn1.i686

src:
    bind-9.8.2-0.62.rc1.56.amzn1.src

x86_64:
    bind-devel-9.8.2-0.62.rc1.56.amzn1.x86_64
    bind-chroot-9.8.2-0.62.rc1.56.amzn1.x86_64
    bind-utils-9.8.2-0.62.rc1.56.amzn1.x86_64
    bind-9.8.2-0.62.rc1.56.amzn1.x86_64
    bind-debuginfo-9.8.2-0.62.rc1.56.amzn1.x86_64
    bind-sdb-9.8.2-0.62.rc1.56.amzn1.x86_64
    bind-libs-9.8.2-0.62.rc1.56.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2017-858.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. However, proof of concept for this vulnerability is available.

2) Security restrictions bypass

EUVDB-ID: #VU7257

Risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-3142

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to an error in TSIG authentication of AXFR and NOTIFY requests. A remote attacker who is able to send and receive messages to an authoritative DNS server and who has knowledge of a valid TSIG key name can send specially crafted request packet, bypass authentication and perform unauthorized zone transfers.

Mitigation

Update the affected packages.

i686:
    bind-sdb-9.8.2-0.62.rc1.56.amzn1.i686
    bind-libs-9.8.2-0.62.rc1.56.amzn1.i686
    bind-debuginfo-9.8.2-0.62.rc1.56.amzn1.i686
    bind-devel-9.8.2-0.62.rc1.56.amzn1.i686
    bind-utils-9.8.2-0.62.rc1.56.amzn1.i686
    bind-chroot-9.8.2-0.62.rc1.56.amzn1.i686
    bind-9.8.2-0.62.rc1.56.amzn1.i686

src:
    bind-9.8.2-0.62.rc1.56.amzn1.src

x86_64:
    bind-devel-9.8.2-0.62.rc1.56.amzn1.x86_64
    bind-chroot-9.8.2-0.62.rc1.56.amzn1.x86_64
    bind-utils-9.8.2-0.62.rc1.56.amzn1.x86_64
    bind-9.8.2-0.62.rc1.56.amzn1.x86_64
    bind-debuginfo-9.8.2-0.62.rc1.56.amzn1.x86_64
    bind-sdb-9.8.2-0.62.rc1.56.amzn1.x86_64
    bind-libs-9.8.2-0.62.rc1.56.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2017-858.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.



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