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Debian Security Advisory DSA-5708-1                   security@debian.org
https://www.debian.org/security/                       Moritz Muehlenhoff
June 11, 2024                         https://www.debian.org/security/faq
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Package        : cyrus-imapd
CVE ID         : CVE-2024-34055

Damian Poddebniak discovered that the Cyrus IMAP server didn't restrict
memory allocation for some command arguments which may result in denial
of service. This update backports new config directives which allow to
configure limits, additional details can be found at:

https://www.cyrusimap.org/3.6/imap/download/release-notes/3.6/x/3.6.5.html

These changes are too intrusive to be backported to the version of
Cyrus in the oldstable distribution (bullseye). If the IMAP server is used
by untrusted users an update to Debian stable/bookworm is recommended.
In addition the version of cyrus-imapd in bullseye-backports will be
updated with a patch soon.

For the stable distribution (bookworm), this problem has been fixed in
version 3.6.1-4+deb12u2.

We recommend that you upgrade your cyrus-imapd packages.

For the detailed security status of cyrus-imapd please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/cyrus-imapd

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org