CVE-2018-5740

A flaw in the "deny-answer-aliases" feature can cause an assertion failure in named

High · published January 16, 2019

Patch now

High probability of exploitation

CVSS calls it high at 7.5. It sits in the 99.1th percentile for exploit probability.

CVSS v3.0

7.5

EPSS

60%

Percentile

99.1

In the wild

Unconfirmed

What it is

"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.

The record

Technical detail

CVSS v3.0: 7.5 · HIGH
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0: Not supplied
EPSS: 0.59620 · 99.1th percentile
Published: 2019-01-16T20:00Z

EPSS history

Timeline

16 JAN 20:00Z
A flaw in the "deny-answer-aliases" feature can cause an assertion failure in named
cvelistv5