Buffer overflow in unbound (Alpine package)

1) Buffer overflow

EUVDB-ID: #VU29237

Risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-16866

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error when processing NOTIFY queries in Unbound. A remote attacker can send a specially crafted NOTIFY query, trigger uninitialized memory access and crash the service.

Successful exploitation of this vulnerability requires that the source IP address of the query matches an access-control rule.

Mitigation

Install update from vendor's website.

Vulnerable software versions

unbound (Alpine package): 1.7.3-r0

External links

http://git.alpinelinux.org/aports/commit/?id=0525728247e68c3ea0700787e56ad61836eb3069
http://git.alpinelinux.org/aports/commit/?id=c15ac7b24c62c2eb5c854f9ba3a7de436c8c553e
http://git.alpinelinux.org/aports/commit/?id=5448ec9e510aed4692e6fb133beed694a0c6b66c
http://git.alpinelinux.org/aports/commit/?id=4dbf057fbe38b3e87d05eb61a918e5154233722a
http://git.alpinelinux.org/aports/commit/?id=93574d3c2153b4857d6ac2aed244d773654aca30
http://git.alpinelinux.org/aports/commit/?id=10154706bf344955d0bcd1e5ecb1ef7a7aeec2e5
http://git.alpinelinux.org/aports/commit/?id=73eb35a4678f12c11a7a0cae308c1acbd4a04e17
http://git.alpinelinux.org/aports/commit/?id=ac13a7ec13c38e284179ba8bd155ea75a6bb62ea

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.