Information disclosure in bind (Alpine package)

1) Information disclosure

EUVDB-ID: #VU13326

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-2018-5738

CWE-ID: CWE-200 - Information exposure

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 update from vendor's website.

Vulnerable software versions

bind (Alpine package): 9.11.3-r0 - 9.11.5-r0

External links

http://git.alpinelinux.org/aports/commit/?id=3142e7931359e784a78891287108e92aefc4393c
http://git.alpinelinux.org/aports/commit/?id=d6ab6c12b91030e3c1d072ed36e093c2ebbc96cf
http://git.alpinelinux.org/aports/commit/?id=6a7a5020482526d5f8f38aa59bf9da6e245d2264
http://git.alpinelinux.org/aports/commit/?id=a72d66cd67f20dec8e4eb3d6f2b387a11a0bfbf8
http://git.alpinelinux.org/aports/commit/?id=5b89784c2f0f07bfbb31371b85fd9c1be3acada5

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.