Denial of service in Dovecot



| Updated: 2019-12-13
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-19722
CWE-ID CWE-476
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Dovecot
Server applications / Mail servers

Vendor Dovecot

Security Bulletin

This security bulletin contains information about 1 vulnerabilities.

UPDATED: 13.12.2019

Updated vulnerability description and list of affected versions due to incomplete patch.

1) NULL pointer dereference

EUVDB-ID: #VU23598

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-19722

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 when parsing group emails or empty values in From/To email fields in "src/plugins/push-notification/push-notification-event-message-common.c". A remote attacker can send an email with a group email address or an empty value in From or To fields and crash push notification drivers.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Dovecot: 2.3.9 - 2.3.9.1

CPE2.3 External links

https://github.com/dovecot/core/blob/2.3.9.1/NEWS
https://github.com/dovecot/core/commit/393a8cabf4dad893bf2ec60bf96cfde7a0c58432


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker 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.



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