CVE-2020-7957: Specially crafted mail can crash snippet generation

[Aki Tuomi]

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


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