Cyrus IMAP 3.0.16 Release Notes¶
This is a bug-fix release in the 3.0 series.
Refer to the Cyrus IMAP 3.0.0 Release Notes for important information about the 3.0 series, including upgrading instructions.
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Changes Since 3.0.15¶
Fixed CVE-2021-33582: Certain user inputs are used as hash table keys during processing. A poorly chosen string hashing algorithm meant that the user could control which bucket their data was stored in, allowing a malicious user to direct many inputs to a single bucket. Each subsequent insertion to the same bucket requires a strcmp of every other entry in it. At tens of thousands of entries, each new insertion could keep the CPU busy in a strcmp loop for minutes.
The string hashing algorithm has been replaced with a better one, and now also uses a random seed per hash table, so malicious inputs cannot be precomputed.
Discovered by Matthew Horsfall, Fastmail
Fixed: expired test certificates caused unit test failures
Fixed: various warnings raised by newer compilers