Fedora 27 update for bind, bind-dyndb-ldap, dnsperf

1) Information disclosure

EUVDB-ID: #VU13326

Risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-5738

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

Exploit availability: No

Description

The vulnerability allows a remote attacker to obtain potentially sensitive information.

The vulnerability exists due to improper access controls. When configured with "recursion yes;" and match list values are not provided for "allow-query-cache" or "allow-query", the "allow-recursion" setting may permit all hosts to perform recursion. A remote attacker can bypass intended recursion access controls, make a recursive query to a BIND nameserver in certain cases and examine the results of queries answered from the cache to determine which queries a server has previously responded to.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 27

dnsperf: before 2.1.0.0-17.fc27

bind-dyndb-ldap: before 11.1-12.fc27

bind: before 9.11.4-1.fc27

CPE2.3

• cpe:2.3:o:fedoraproject:fedora:27:*:*:*:*:*:*:*
• cpe:2.3:a:fedoraproject:dnsperf:*:*:*:*:*:fedora:*:*
• cpe:2.3:a:fedoraproject:bind-dyndb-ldap:*:*:*:*:*:fedora:*:*
• cpe:2.3:a:fedoraproject:bind:*:*:*:*:*:fedora:*:*

External links

https://bodhi.fedoraproject.org/updates/FEDORA-2018-c0f12f789e

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.