CVE-2018-5738
Last modified
CVE-2018-5738 is a vulnerability of currently unknown severity. Change #4777 (introduced in October 2017) introduced an unforeseen issue in releases which were issued after that date, affecting which clients are permitted to make recursive queries to a BIND nameserver. The intended (and documented) behavior is that if an operator has not specified a value for the "allow-recursion" setting, it SHOULD default to one of the following: none, if "recursion no;" is set in named.conf; a value inherited from the "allow-query-cache" or "allow-query" settings IF "recursion yes;" (the default for that setting) AND match lists are explicitly set for "allow-query-cache" or "allow-query" (see the BIND9 Administrative Reference Manual section 6.2 for more details); or the intended default of "allow-recursion {localhost; localnets;};" if "recursion yes;" is in effect and no values are explicitly set for "allow-query-cache" or "allow-query". EPSS estimates a 11.07% chance of exploitation in the next 30 days.
Description
Change #4777 (introduced in October 2017) introduced an unforeseen issue in releases which were issued after that date, affecting which clients are permitted to make recursive queries to a BIND nameserver. The intended (and documented) behavior is that if an operator has not specified a value for the "allow-recursion" setting, it SHOULD default to one of the following: none, if "recursion no;" is set in named.conf; a value inherited from the "allow-query-cache" or "allow-query" settings IF "recursion yes;" (the default for that setting) AND match lists are explicitly set for "allow-query-cache" or "allow-query" (see the BIND9 Administrative Reference Manual section 6.2 for more details); or the intended default of "allow-recursion {localhost; localnets;};" if "recursion yes;" is in effect and no values are explicitly set for "allow-query-cache" or "allow-query". However, because of the regression introduced by change #4777, it is possible when "recursion yes;" is in effect and no match list values are provided for "allow-query-cache" or "allow-query" for the setting of "allow-recursion" to inherit a setting of all hosts from the "allow-query" setting default, improperly permitting recursion to all clients. Affects BIND 9.9.12, 9.10.7, 9.11.3, 9.12.0->9.12.1-P2, the development release 9.13.0, and also releases 9.9.12-S1, 9.10.7-S1, 9.11.3-S1, and 9.11.3-S2 from BIND 9 Supported Preview Edition.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Isc | Bind | 9.9.12 |
| Isc | Bind | 9.10.7 |
| Isc | Bind | 9.11.3 |
| Isc | Bind | 9.12.0 |
| Isc | Bind | 9.12.1 |
| Isc | Bind | 9.13.0 |
| Canonical | Ubuntu Linux | 18.04 |
References
- http://www.securitytracker.com/id/1041115Third Party Advisory, VDB Entry
- https://kb.isc.org/docs/aa-01616Mitigation, Vendor Advisory
- https://security.gentoo.org/glsa/201903-13Third Party Advisory
- https://usn.ubuntu.com/3683-1/Third Party Advisory
- http://www.securitytracker.com/id/1041115Third Party Advisory, VDB Entry
- https://kb.isc.org/docs/aa-01616Mitigation, Vendor Advisory
- https://security.gentoo.org/glsa/201903-13Third Party Advisory
- https://usn.ubuntu.com/3683-1/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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