SB2020052631 - Multiple vulnerabilities in qmail netqmail

Description

This security bulletin contains information about 2 vulnerabilities.

1) Input validation error (CVE-ID: CVE-2020-3811)

CWE-ID: CWE-20 - Improper input validation

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

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.

2) Information disclosure (CVE-ID: CVE-2020-3812)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

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.

Remediation

Install update from vendor's website.

References

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