Multiple vulnerabilities in Dovecot



Published: 2021-01-04
Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2020-24386
CVE-2020-25275
CWE-ID CWE-200
CWE-20
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) Information disclosure

EUVDB-ID: #VU49237

Risk: Medium

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

CVE-ID: CVE-2020-24386

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote user to gain access to sensitive information.

The vulnerability exists due to an error, related to IMAP hibernation. A remote user can run a specially crafted command to discover system directory structure and access emails of other users.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Dovecot: 2.2.26 - 2.3.11.3

External links

http://dovecot.org/pipermail/dovecot-news/2021-January/000450.html


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) Input validation error

EUVDB-ID: #VU49238

Risk: Medium

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

CVE-ID: CVE-2020-25275

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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 when processing messages with more than 10 000 MIME parts. A remote attacker can send a specially crafted message to the application and perform a denial of service (DoS) attack.

Note, this vulnerability was introduced by the fix for #VU45671.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Dovecot: 2.3.11 - 2.3.11.3

External links

http://dovecot.org/pipermail/dovecot-news/2021-January/000451.html


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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