Multiple vulnerabilities in Dovecot



Published: 2020-08-13
Risk Medium
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2020-12100
CVE-2020-12673
CVE-2020-12674
CWE-ID CWE-835
CWE-125
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 3 vulnerabilities.

1) Infinite loop

EUVDB-ID: #VU45671

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2020-12100

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

Description

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

The vulnerability exists due to infinite loop in submission, lmtp, and lda when processing e-mail message with deeply nested MIME parts. A remote attacker can send a specially crafted email to consume all available system resources and cause denial of service conditions.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Dovecot: 2.3.0 - 2.3.11.2

CPE2.3 External links

http://dovecot.org/pipermail/dovecot-news/2020-August/000441.html


Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

2) Out-of-bounds read

EUVDB-ID: #VU45672

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2020-12673

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

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

The vulnerability exists due to a boundary condition when processing NTLM requests. A remote attacker can send a specially formatted NTLM reques, trigger out-of-bounds read error and crash the auth service.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Dovecot: 2.3.0 - 2.3.11.2

CPE2.3 External links

http://dovecot.org/pipermail/dovecot-news/2020-August/000442.html


Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

3) Input validation error

EUVDB-ID: #VU45673

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2020-12674

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 in RPA requests. A remote attacker can send a specially formatted 0-lenght RPA request and crash the auth service.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Dovecot: 2.3.0 - 2.3.11.2

CPE2.3 External links

http://dovecot.org/pipermail/dovecot-news/2020-August/000443.html


Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?



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