Add advisory for pnet_packet (#1595)

Co-authored-by: sidunder <sidunder@users.noreply.github.com>

crates/pnet_packet/RUSTSEC-0000-0000.md

@@ -0,0 +1,18 @@
+```toml
+[advisory]
+id = "RUSTSEC-0000-0000"
+package = "pnet_packet"
+date = "2020-06-19"
+url = "https://github.com/libpnet/libpnet/issues/449"
+categories = ["memory-corruption"]
+cvss = "CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H"
+
+[versions]
+patched = [">= 0.27.2"]
+```
+
+# `pnet_packet` buffer overrun in `set_payload` setters
+
+As indicated by this [issue](https://github.com/libpnet/libpnet/issues/449#issuecomment-663355987), a buffer overrun is possible in the `set_payload` setter of the various mutable "Packet" struct setters. The offending `set_payload` functions were defined within the struct `impl` blocks in earlier versions of the package, and later by the `packet` macro.
+
+Fixed in the `packet` macro by [this](https://github.com/libpnet/libpnet/pull/455) PR.