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Advisories

OpenResty lua-resty-dns before 0.24 Denial of Service via DNS Response Parsing

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Severity
medium
Date
Affecting

  • lua-resty-dns >= 0, < 0.24

CWE
  • CWE-130 Improper Handling of Length Parameter Inconsistency
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Credit
Siyang Wu
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.

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