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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
Low
Partial disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products
openresty:lua-resty-dns
References 5
https://github.com/openresty/lua-resty-dns/pull/83
NVD
https://github.com/openresty/lua-resty-dns/commit/b68eaecbf7997ac71c08ba56032b1…
NVD
https://github.com/openresty/lua-resty-dns/blob/v0.23/lib/resty/dns/resolver.lu…
NVD
https://github.com/openresty/lua-resty-dns/tree/v0.24
NVD
https://www.vulncheck.com/advisories/openresty-lua-resty-dns-before-0.24-denial…
VulnCheck Advisory: OpenResty lua-resty-dns before 0.24 Denial of Service via DNS Response Parsing