Permissions, Privileges, and Access Controls in bind (Alpine package)

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU45817

Risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-8624

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote user to perform unauthorized actions.

The vulnerability exists due to change 4885 in BIND inadvertently caused "update-policy" rules of type "subdomain" to be treated as if they were of type "zonesub", allowing updates to all parts of the zone along with the intended subdomain. A remote user with privileges to change a specific subset of the zone's content could abuse these unintended additional privileges to update other contents of the zone.

Mitigation

Install update from vendor's website.

Vulnerable software versions

bind (Alpine package): 9.10.3-r0 - 9.16.5-r0

CPE2.3

• cpe:2.3:o:alpine:bind_alpine_package:9.10.3-r0:*:*:*:*:alpine_linux:*:3.0
• cpe:2.3:o:alpine:bind_alpine_package:9.10.3_p2-r0:*:*:*:*:alpine_linux:*:3.0
• cpe:2.3:o:alpine:bind_alpine_package:9.10.3_p3-r0:*:*:*:*:alpine_linux:*:3.0

External links

https://git.alpinelinux.org/aports/commit/?id=552c94635b72b576bfec8998742e244004c22aa4

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.