SB2020110428 - Red Hat Enterprise Linux 8 update for dovecot

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Main Vulnerability Database SB2020110428

SB2020110428 - Red Hat Enterprise Linux 8 update for dovecot

Published: November 4, 2020

Security Bulletin ID SB2020110428
Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 secuirty vulnerabilities.


1) Use-after-free (CVE-ID: CVE-2020-10958)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error when processing newline characters. A remote attacker can a specially crafted command to submission, submission-login or lmtp service and perform a denial of service (DoS) attack.


2) Input validation error (CVE-ID: CVE-2020-10967)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input passed via email message. A remote attacker can send a specially crafted email with empty quoted localpart and crash the submission or lmtp service.

PoC:

Send mail with envelope sender or recipient as ``<""@example.org>``.

Remediation

Install update from vendor's website.

References