High severity · published Jan 16, 2019
CVE-2018-5740
A flaw in the "deny-answer-aliases" feature can cause an assertion failure in named
7.5
CVSS
60.2%
EPSS
No
On KEV
Description
"deny-answer-aliases" is a little-used feature intended to help recursive server operators protect end users against DNS rebinding attacks, a potential method of circumventing the security model used by client browsers. However, a defect in this feature makes it easy, when the feature is in use, to experience an assertion failure in name.c. Affects BIND 9.7.0->9.8.8, 9.9.0->9.9.13, 9.10.0->9.10.8, 9.11.0->9.11.4, 9.12.0->9.12.2, 9.13.0->9.13.2.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)60.2% · higher than 99% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
B9
BIND 9 · ISC
BIND 9 9.7.0->9.8.8, 9.9.0->9.9.13, 9.10.0->9.10.8, 9.11.0->9.11.4, 9.12.0->9.12.2, 9.13.0->9.13.2 · source: vendor
BI
Bind · Isc
9.7.0 before 9.8.8; 9.9.0 before 9.9.13; 9.10.0 before 9.10.8; 9.11.0 before 9.11.4; 9.12.0 before 9.12.2; 9.13.0 before 9.13.2 · source: NVD
DO
Data Ontap Edge · Netapp
All versions, or not specified · source: NVD
DL
Debian Linux · Debian
8.0; 9.0 · source: NVD
EL
Enterprise Linux Desktop · Redhat
6.0; 7.0 · source: NVD
EL
Enterprise Linux Server · Redhat
6.0; 7.0 · source: NVD
EL
Enterprise Linux Server Aus · Redhat
7.6 · source: NVD
EL
Enterprise Linux Server Eus · Redhat
7.5; 7.6 · source: NVD
EL
Enterprise Linux Workstation · Redhat
6.0; 7.0 · source: NVD
HP
Hp-ux · HP
All versions, or not specified · source: NVD
LE
Leap · Opensuse
15.0; 15.1; 42.3 · source: NVD
UL
Ubuntu Linux · Canonical
12.04; 14.04; 16.04; 18.04 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-5740
CVE.org
https://www.cve.org/CVERecord?id=CVE-2018-5740
Mailing List
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00026.html
Mailing List
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00027.html
Third Party Advisory
http://www.securityfocus.com/bid/105055
Third Party Advisory
http://www.securitytracker.com/id/1041436
Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2570
Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2571
More from BIND 9
9.8
CVE-2026-3593
Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation
8.6
CVE-2026-13321
DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field
8.6
CVE-2025-40780
Cache poisoning due to weak PRNG
8.6
CVE-2025-40778
Cache poisoning attacks with unsolicited RRs
8.6
CVE-2025-40776
Birthday Attack against Resolvers supporting ECS