dovecot-2.3.9.3

[Douglas R. Reno]

New micro version

v2.3.9.3 2019-02-12  Aki Tuomi <aki.tuomi at open-xchange.com>

    * CVE-2020-7046: Truncated UTF-8 can be used to DoS
      submission-login and lmtp processes.
    * CVE-2020-7957: Specially crafted mail can crash snippet generation.

Open-Xchange Security Advisory 2020-02-12

Affected product: Dovecot Core
Internal reference: DOV-3744 (JIRA ID)
Vulnerability type: Improper Input Validation (CWE-30)
Vulnerable version: 2.3.9
Vulnerable component: submission-login, lmtp
Fixed version: 2.3.9.3
Report confidence: Confirmed
Solution status: Fixed
Researcher credits: Open-Xchange oy
Vendor notification: 2020-01-14
CVE reference: CVE-2020-7046
CVSS: 7.5 (CVSS3.1:AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Vulnerability Details:

lib-smtp doesn't handle truncated command parameters properly, resulting
in infinite loop taking 100% CPU for the process. This happens for LMTP
(where it doesn't matter so much) and also for submission-login where
unauthenticated users can trigger it.

Risk:

Attacker can cause submission-login and lmtp processes to be exhausted,
leading into denial of service and CPU resource exhaustion.

Solution:

Upgrade to 2.3.9.3.

Open-Xchange Security Advisory 2020-02-12

Affected product: Dovecot Core
Internal reference: DOV-3743 (JIRA ID)
Vulnerability type: Improper Input Validation (CWE-30)
Vulnerable version: 2.3.9
Vulnerable component: lmtp, imap
Fixed version: 2.3.9.3
Report confidence: Confirmed
Solution status: Fixed
Researcher credits: Open-Xchange oy
Vendor notification: 2020-01-14
CVE reference: CVE-2020-7957
CVSS: 3.1 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L)

Vulnerability Details:

Snippet generation crashes if:

     message is large enough that message-parser returns multiple body
blocks
    The first block(s) don't contain the full snippet (e.g. full of
whitespace)
    input ends with '>'

Risk:

Sending specially crafted email can cause mailbox to have permanently
unaccessible mail, or the mail can be stuck in delivery.

Solution:

Upgrade to 2.3.9.3

[Tim Tassonis]

Fixed in revision 22668.