Multiple vulnerabilities in Dovecot

Published: 2019-05-01 | Updated: 2019-05-06

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2019-11494 CVE-2019-11499
CWE-ID	CWE-476 CWE-399
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Dovecot Server applications / Mail servers
Vendor	Dovecot

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) NULL pointer dereference

EUVDB-ID: #VU18399

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-11494

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

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

The vulnerability exists due to a NULL pointer dereference error within Submission-login when processing authentication. A remote attacker can unexpectedly abort the authentication process by disconnecting from the server during authentication and cause the software to crash.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Dovecot: 2.3.0 - 2.3.5.2

External links

http://dovecot.org/doc/NEWS-2.3

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Resource management error

EUVDB-ID: #VU18400