Multiple vulnerabilities in qmail netqmail

Published: 2020-05-26 | Updated: 2020-08-08

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2020-3811 CVE-2020-3812
CWE-ID	CWE-20 CWE-200
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	netqmail Server applications / Mail servers Debian Linux Operating systems & Components / Operating system
Vendor	qmail Debian

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Input validation error

EUVDB-ID: #VU34380

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-3811

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to manipulate data.

qmail-verify as used in netqmail 1.06 is prone to a mail-address verification bypass vulnerability.

Mitigation

Install update from vendor's website.

Vulnerable software versions

netqmail: 1.06

Debian Linux: 1.06 - 9.0

CPE2.3

External links

http://bugs.debian.org/961060
http://lists.debian.org/debian-lts-announce/2020/06/msg00002.html
http://www.debian.org/security/2020/dsa-4692
http://www.openwall.com/lists/oss-security/2020/05/19/8

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.

2) Information disclosure

EUVDB-ID: #VU34381

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-3812

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a local authenticated user to gain access to sensitive information.

qmail-verify as used in netqmail 1.06 is prone to an information disclosure vulnerability. A local attacker can test for the existence of files and directories anywhere in the filesystem because qmail-verify runs as root and tests for the existence of files in the attacker's home directory, without dropping its privileges first.

Mitigation

Install update from vendor's website.

Vulnerable software versions

netqmail: 1.06

Debian Linux: 1.06 - 9.0

CPE2.3

External links

http://bugs.debian.org/961060
http://lists.debian.org/debian-lts-announce/2020/06/msg00002.html
http://www.debian.org/security/2020/dsa-4692
http://www.openwall.com/lists/oss-security/2020/05/19/8

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

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.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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