CVE-2018-5740
"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.
- Isc Bind
- < 9.8.8, 9.9.13, 9.10.8, 9.11.4, 9.12.2, 9.13.2
- Fix
- Available
- CVSS 3.1
- 7.5 HIGH
- EPSS
- 59.6% (99th percentile)
- Weakness
- CWE-617
- NVD status
- Modified
- Published
- 2019-01-16
Fix
Most operators will not need to make any changes unless they are using the "deny-answer-aliases" feature (which is described in the BIND 9 Adminstrator Reference Manual section 6.2.) "deny-answer-aliases" is off by default; only configurations which explicitly enable it can be affected by this defect. If you are using "deny-answer-aliases", upgrade to the patched release most closely related to your current version of BIND. 9.9.13-P1 9.10.8-P1 9.11.4-P1 9.12.2-P1 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. 9.11.3-S3
Workaround
This vulnerability can be avoided by disabling the "deny-answer-aliases" feature if it is in use.
No indexed exploits for CVE-2018-5740 yet
Our index is partial: it proves presence, never absence
No exploit for CVE-2018-5740 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.