Add advisory for buffered-reader (#1697)

Attacker-controlled input can lead to an out-of-bounds index, which
causes buffered-reader to panic.  This has been fixed in versions
1.2.0, 1.1.5, and 1.0.2 of buffered-reader.

crates/buffered-reader/RUSTSEC-0000-0000.md

@@ -0,0 +1,24 @@
+```toml
+[advisory]
+id = "RUSTSEC-0000-0000"
+package = "buffered-reader"
+date = "2023-05-16"
+url = "https://lists.sequoia-pgp.org/hyperkitty/list/announce@lists.sequoia-pgp.org/thread/SN2E3QRT4DMQ5JNEK6VIN6DJ5SH766DI/"
+references = ["https://gitlab.com/sequoia-pgp/sequoia/-/tags/buffered-reader%2Fv1.2.0"]
+categories = ["denial-of-service"]
+# Attacker-controlled input can result in a panic due to an
+# out-of-bounds array index.
+keywords = ["panic"]
+
+[versions]
+patched = [">= 1.0.2, < 1.1.0", ">= 1.1.5, < 1.2.0", ">= 1.2.0"]
+```
+
+# Out-of-bounds array access leads to panic
+
+Affected versions of the crate have a bug where attacker-controlled
+input can result in the use of an out-of-bound array index.  Rust
+detects the use of the out-of-bound index and causes the application
+to panic.  An attacker may be able to use this to cause a
+denial-of-service.  However, it is not possible for an attacker to
+read from or write to the application's address space.