Vulnerability in openresty lua-resty-dns

[ Description ]Official description

OpenResty lua-resty-dns before 0.24 contains an improper input validation vulnerability in parse_section() and _decode_name() that fails to check resource record lengths against the received message. Attackers controlling or spoofing a queried nameserver can send truncated record headers or RDATA, raising uncaught Lua exceptions in resolver:query() that abort requests and break name resolution.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• github.com/openresty/lua-resty-dns/blob/v0.23/lib/resty/dns/resolver.lua
• github.com/openresty/lua-resty-dns/commit/b68eaecbf7997ac71c08ba56032b1f45438bd758
• github.com/openresty/lua-resty-dns/pull/83
• github.com/openresty/lua-resty-dns/tree/v0.24
• www.vulncheck.com/advisories/openresty-lua-resty-dns-before-0.24-denial-of-service-via-…