CVE-2018-5740

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.

How to fix CVE-2018-5740

To remediate CVE-2018-5740, upgrade the affected package to a fixed version below.

• —upgrade to 9.12.2_p1-r0 or later
• —upgrade to 1:9.11.4.P1+dfsg-1 or later
• —upgrade to 1:9.9.5.dfsg-9+deb8u16 or later
• —upgrade to 1:9.10.3.dfsg.P4-12.3+deb9u10 or later

Is CVE-2018-5740 being exploited?

Likely — EPSS is 64.5%, placing CVE-2018-5740 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.

Affected packages (4)

• from 0, < 9.12.2_p1-r0
• from 0, < 1:9.11.4.P1+dfsg-1
• from 0, < 1:9.9.5.dfsg-9+deb8u16
• from 0, < 1:9.10.3.dfsg.P4-12.3+deb9u10

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2018-5740
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2018-5740