Cyrus IMAP vulnerabilities

Integer overflow in the index_urlfetch function in imap/index.c in Cyrus IMAP 2.3.19, 2.4.18, and 2.5.6 allows remote attackers to have unspecified impact via vectors related to urlfetch range checks and the start_octet variable.

The index_urlfetch function in Cyrus IMAP versions 2.3.x before 2.3.19, 2.4.x before 2.4.18, and 2.5.x before 2.5.4 allows remote attackers to obtain sensitive information or possibly have unspecified other impact via vectors related to the urlfetch range, which triggers an out-of-bounds heap read.

In the mboxlist_do_find function in Cyrus IMAP before version 3.0.4, an off-by-one error in prefix calculation for the LIST command led to the use of uninitialized memory. This may allow remote attackers to obtain sensitive information or cause a daemon crash.

In Cyrus IMAP before 3.12.4, there is a double-free vulnerability in the VPATCH BYPARAM mechanism. An authenticated calendar user can crash a CalDAV worker by sending a PATCH request with PATCH-ACTION="BYPARAM@..." against a resource with two or more properties of the matched kind. The memory holding the selector is freed multiple times during iteration over properties.

In Cyrus IMAP before 3.12.4, there is a Sieve mailbox existence oracle. An authenticated user can install a Sieve script that probes whether another user's private mailbox exists, or reads the value of shared mailbox annotations, by observing which fileinto branch fires during LMTP delivery.

In Cyrus IMAP before 3.12.4, Mailbox/set let a sharee change a special-use role on shared mailboxes. An authenticated user with maySetKeywords on another user's mailbox could change that mailbox's specialuse annotation. This could allow the sharee to change the shared mailbox to perform the archived, snoozed, or other role, which might cause mail to be written to the shared mailbox, sharing more content than intended.

In Cyrus IMAP before 3.12.4, CalDAV/CardDAV multiget bypasses a per-href ACL. An authenticated DAV user with some shared access to another user's calendar or address book could read even unshared events or contacts by including the target hrefs in a calendar-multiget or addressbook-multiget REPORT.

In Cyrus IMAP before 3.12.4, a JMAP email-header blob ID can reference an out-of-bounds index. An authenticated user could attempt to download a crafted JMAP blob ID of the form H<emailid>-<index>, which could read past the end of the internal blob_headers array during download, exposing adjacent heap memory.

In Cyrus IMAP before 3.12.4, JMAP snooze bypasses the destination-mailbox ACL. An authenticated user with insert permissions on another user's snoozed mailbox could cause insertion of mail to that user's inbox, or any other of their mailboxes whose id was known to the user, despite having no insert permissions to the target mailbox.

In cyrus-imapd up to version 3.12.2, the LISTRIGHTS command was not restricted to users with admin access. An authenticated user could call LISTRIGHTS against any mailbox they could name and learn what principals had what access to it.

In cyrus-imapd up to version 3.12.2, a vulnerability was discovered involving heap exposure during parsing of nested MIME comments. An authenticated IMAP user can craft an email message containing an RFC 822 comment ending with a backslash, causing the server to read past the message's end in memory and return heap content.

In cyrus-imapd up to version 3.12.2, an issue was discovered where URLAUTH does not honor revoked authorizer access. A URLAUTH URL minted while the authorizer had access continued to work after that access was revoked.

In cyrus-imapd up to version 3.12.2, a vulnerability allows GENURLAUTH-issued tokens to bypass ACLs. Any authenticated user can mint a URLAUTH token for any mailbox they can name, even without read access, enabling reading of mail from that mailbox.

In cyrus-imapd up to version 3.12.2, a vulnerability was found where the LOCALDELETE command bypassed ACL checks. An authenticated non-admin user could invoke the admin-only LOCALDELETE IMAP command and delete mailboxes for which they had no permissions.

In cyrus-imapd up to version 3.12.2, the vacation 'fcc' feature bypasses the destination mailbox ACL check. A user with a vacation Sieve script using :fcc can deliver auto-reply copies to any mailbox, regardless of insert permissions.