CVE-2019-6475— ISC BIND 输入验证错误漏洞

A flaw in mirror zone validity checking can allow zone data to be spoofed

Mirror zones are a BIND feature allowing recursive servers to pre-cache zone data provided by other servers. A mirror zone is similar to a zone of type secondary, except that its data is subject to DNSSEC validation before being used in answers, as if it had been looked up via traditional recursion, and when mirror zone data cannot be validated, BIND falls back to using traditional recursion instead of the mirror zone. However, an error in the validity checks for the incoming zone data can allow an on-path attacker to replace zone data that was validated with a configured trust anchor with forged data of the attacker's choosing. The mirror zone feature is most often used to serve a local copy of the root zone. If an attacker was able to insert themselves into the network path between a recursive server using a mirror zone and a root name server, this vulnerability could then be used to cause the recursive server to accept a copy of falsified root zone data. This affects BIND versions 9.14.0 up to 9.14.6, and 9.15.0 up to 9.15.4.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

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ISC BIND 输入验证错误漏洞

ISC BIND是美国ISC公司的一套实现了DNS协议的开源软件。 ISC BIND 9.14.0版本至9.14.6版本和9.15.0版本至9.15.4版本中的Mirror区域存在安全漏洞。攻击者可利用该漏洞伪造数据。

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