Resource management error in bind (Alpine package)

1) Resource management error

EUVDB-ID: #VU28121

Risk: High

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-8616

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

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

The vulnerability exists due to improper management of internal resources with the applicatoin. In order for a server performing recursion to locate records in the DNS graph it must be capable of processing referrals, such as those received when it attempts to query an authoritative server for a record which is delegated elsewhere. A malicious actor who intentionally exploits this lack of effective limitation on the number of fetches performed when processing referrals can, through the use of specially crafted referrals, cause a recursing server to issue a very large number of fetches in an attempt to process the referral.

Mitigation

Install update from vendor's website.

Vulnerable software versions

bind (Alpine package): 9.6.1-r0 - 9.14.8-r7

CPE2.3

• cpe:2.3:o:alpine:bind_alpine_package:9.14.4-r3:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:bind_alpine_package:9.14.4-r2:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:bind_alpine_package:9.12.3_p1-r0:*:*:*:*:alpine_linux:*:

External links

http://git.alpinelinux.org/aports/commit/?id=9fd4335a39b73f3ab692a227e470c31d0fc161b1
http://git.alpinelinux.org/aports/commit/?id=54d9d7620b3c43d194b0db4a84b55f3def94cd75
http://git.alpinelinux.org/aports/commit/?id=f415ad5b8bc9e3fb57d3f950785b0203d7eee934
http://git.alpinelinux.org/aports/commit/?id=ff7db7c636342b669dde2b034e9c8c887cb9ee90

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.