Vulnerability identifier: #VU29237
Vulnerability 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:
CWE-ID:
CWE-119
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Unbound
Server applications /
DNS servers
Vendor: NLnet Labs
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 updates from vendor's website.
Vulnerable software versions
Unbound: 1.9.0 - 1.9.3 rc2
External links
http://github.com/NLnetLabs/unbound/blob/release-1.9.4/doc/Changelog
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/E65NCWZZB2D75ZIYWPXKMVGSGNYW4JMC/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MLRHE7TQFAOV4MB2ELTOGESZYUL65NUJ/
http://nlnetlabs.nl/downloads/unbound/CVE-2019-16866.txt
http://seclists.org/bugtraq/2019/Oct/23
http://usn.ubuntu.com/4149-1/
http://www.debian.org/security/2019/dsa-4544
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.