Reachable Assertion in bind (Alpine package)

1) Reachable Assertion

EUVDB-ID: #VU45819

Risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-8622

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 handling TSIG-signed request. An attacker on the network path for a TSIG-signed request, or operating the server receiving the TSIG-signed request, could send a truncated response to that request, triggering an assertion failure, causing the server to exit.

Mitigation

Install update from vendor's website.

Vulnerable software versions

bind (Alpine package): 9.6.1-r0 - 9.16.5-r0

CPE2.3

• cpe:2.3:o:alpine:bind_alpine_package:9.6.1-r0:*:*:*:*:alpine_linux:*:1.10
• cpe:2.3:o:alpine:bind_alpine_package:9.7.1-r0:*:*:*:*:alpine_linux:*:2.0
• cpe:2.3:o:alpine:bind_alpine_package:9.7.3-r0:*:*:*:*:alpine_linux:*:2.1

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.