漏洞信息
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Vulnerability Title
CoreDNS: rewrite-plugin EDNS0 response-revert nil-pointer panic (remote DoS) when a downstream plugin returns a response with no OPT record
Vulnerability Description
CoreDNS is a DNS server written in Go. Prior to 1.14.5, the CoreDNS rewrite plugin supports edns0 rewrite rules with an optional revert flag, and two response rules, edns0SetResponseRule and edns0ReplaceResponseRule[T] in plugin/rewrite/edns0.go, call res.IsEdns0() and immediately dereference the returned *dns.OPT without a nil check when a downstream plugin returns a response with no OPT record. A remote, unauthenticated client can send a single ordinary DNS query matching a rewrite edns0 <local|nsid|subnet> <set|append|replace> ... revert rule, causing ResponseReverter in plugin/rewrite/reverter.go to panic, return SERVFAIL, and degrade availability, or crash the CoreDNS process if the debug directive disables recovery. This issue is fixed in version 1.14.5.
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Vulnerability Type
空指针解引用
Vulnerability Title
CoreDNS 异常处理不当漏洞
Vulnerability Description
CoreDNS是CoreDNS团队开源的一个 DNS 服务器。 CoreDNS 1.14.5之前版本存在异常处理不当漏洞,该漏洞源于rewrite插件对edns0规则响应中的OPT记录进行空指针解引用,可能导致远程未经身份验证的客户端通过发送匹配规则的普通DNS查询,引发响应处理程序恐慌,进而导致服务降级或进程崩溃。
CVSS Information
N/A
Vulnerability Type
N/A