Reachable Assertion in bind (Alpine package)

1) Reachable Assertion

EUVDB-ID: #VU31827

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-2019-6467

CWE-ID: CWE-617 - Reachable Assertion

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

A programming error in the nxdomain-redirect feature can cause an assertion failure in query.c if the alternate namespace used by nxdomain-redirect is a descendant of a zone that is served locally. The most likely scenario where this might occur is if the server, in addition to performing NXDOMAIN redirection for recursive clients, is also serving a local copy of the root zone or using mirroring to provide the root zone, although other configurations are also possible. Versions affected: BIND 9.12.0-> 9.12.4, 9.14.0. Also affects all releases in the 9.13 development branch.

Mitigation

Install update from vendor's website.

Vulnerable software versions

bind (Alpine package): 9.11.5_p4-r0 - 9.11.6-r1

External links

http://git.alpinelinux.org/aports/commit/?id=5f63a5fe529bbf21d6df33b174df042d09bc53c3
http://git.alpinelinux.org/aports/commit/?id=06bfe718fd41663cb0f35a441af82a32ca3ec15b
http://git.alpinelinux.org/aports/commit/?id=9308e5b9ccb34e36206ae4390d0c6b06c46e06d2
http://git.alpinelinux.org/aports/commit/?id=935add8c0f7f6c11b2382695b3369beb40d3618c
http://git.alpinelinux.org/aports/commit/?id=aae4252e693b8d9f14125c4ec15b1bd746895f39
http://git.alpinelinux.org/aports/commit/?id=4a3cd5e69c83561fa3b30cf07f92104a81cdbac6

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.