CVE-2018-5740

Published: 9 August 2018

"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.

Mitigation

Disable use of "deny-answer-aliases" feature

Priority

Medium

CVSS 3 base score: 7.5

Status

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-5740
• https://kb.isc.org/article/AA-01639/74/CVE-2018-5740
• https://ubuntu.com/security/notices/USN-3769-1
• https://ubuntu.com/security/notices/USN-3769-2
• NVD
• Launchpad
• Debian

Bugs

• http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=905743