Arch Linux update for dovecot

Published: 2020-02-13

Risk	High
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2020-7046 CVE-2020-7957
CWE-ID	CWE-835 CWE-20
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Arch Linux Operating systems & Components / Operating system
Vendor	Arch Linux

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Infinite loop

EUVDB-ID: #VU25339

Risk: High

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-7046

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 lib-smtp in submission-login and lmtp and processing truncated UTF-8 data in command parameters. A remote non-authenticated attacker can send specially crafted command to the dovecot server and consume all available system resources and perform a denial of service attack.

Mitigation

Update the affected package dovecot to version 2.3.9.3-1.

Vulnerable software versions

Arch Linux: All versions

External links

http://security.archlinux.org/advisory/ASA-202002-6

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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

2) Input validation error

EUVDB-ID: #VU25340

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-7957

CWE-ID: CWE-20 - Improper input validation