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Test ID:1.3.6.1.4.1.25623.1.0.844981
Category:Ubuntu Local Security Checks
Title:Ubuntu: Security Advisory for dovecot (USN-4993-1)
Summary:The remote host is missing an update for the 'dovecot'; package(s) announced via the USN-4993-1 advisory.
Description:Summary:
The remote host is missing an update for the 'dovecot'
package(s) announced via the USN-4993-1 advisory.

Vulnerability Insight:
Kirin discovered that Dovecot incorrectly escaped kid and azp fields in JWT
tokens. A local attacker could possibly use this issue to validate tokens
using arbitrary keys. This issue only affected Ubuntu 20.10 and Ubuntu
21.04. (CVE-2021-29157)

Fabian Ising and Damian Poddebniak discovered that Dovecot incorrectly
handled STARTTLS when using the SMTP submission service. A remote attacker
could possibly use this issue to inject plaintext commands before
STARTTLS negotiation. (CVE-2021-33515)

Affected Software/OS:
'dovecot' package(s) on Ubuntu 20.10, Ubuntu 20.04 LTS.

Solution:
Please install the updated package(s).

CVSS Score:
5.8

CVSS Vector:
AV:N/AC:M/Au:N/C:P/I:P/A:N

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2021-29157
Common Vulnerability Exposure (CVE) ID: CVE-2021-33515
CopyrightCopyright (C) 2021 Greenbone Networks GmbH

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