Reachable Assertion in bind (Alpine package)

1) Reachable Assertion

EUVDB-ID: #VU29151

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-8619

CWE-ID: CWE-617 - Reachable Assertion

Exploit availability: No

Description

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

The vulnerability exists due to a reachable assertion when processing entries with an asterisk ("*") character in rbtdb.c. Unless a nameserver is providing authoritative service for one or more zones and at least one zone contains an empty non-terminal entry containing an asterisk ("*") character, an attacker with ability to change zone content can trigger assertion failure and perform a denial of service (DoS) attack.

Note, this vulnerability may affect hosting provider that allow users access to domain management functionality.

Mitigation

Install update from vendor's website.

Vulnerable software versions

bind (Alpine package): 9.14.12-r0

External links

http://git.alpinelinux.org/aports/commit/?id=9fd4335a39b73f3ab692a227e470c31d0fc161b1

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.