Security Information / 2011 / Security Information -- DSA-2242-1 cyrus-imapd-2.2

Debian Security Advisory

DSA-2242-1 cyrus-imapd-2.2 -- implementation error

Date Reported:

25 May 2011

Affected Packages:

cyrus-imapd-2.2

Vulnerable:

Yes

Security database references:

In the Debian bugtracking system: Bug 627081.
In Mitre's CVE dictionary: CVE-2011-1926.

More information:

It was discovered that the STARTTLS implementation of the Cyrus IMAP server does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted IMAP, LMTP, NNTP and POP3 sessions by sending a cleartext command that is processed after TLS is in place.

For the oldstable distribution (lenny), this problem has been fixed in version 2.2.13-14+lenny4.

For the stable distribution (squeeze), this problem has been fixed in version 2.2.13-19+squeeze1.

For the unstable distribution (sid), this problem has been fixed in version 2.2.13p1-11 for cyrus-imapd-2.2 and in version 2.4.7-1 for cyrus-imapd-2.4.

We recommend that you upgrade your cyrus-imapd-2.2 packages.