SB2020040119 - Red Hat Enterprise Linux 7 update for dovecot
Published: April 1, 2020
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Authentication bypass (CVE-ID: CVE-2019-3814)
CWE-ID: CWE-592 - Authentication Bypass Issues
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:P/U:Green
The vulnerability allows a remote authenticated attacker to bypass authentication.
The weakness exists due to taking of the username from the user provided authentication fields (e.g. LOGIN command). A remote attacker with access to a valid trusted certificate without the ssl_cert_username_field in it can bypass password verification if the provided trusted SSL certificate is missing the username field and login as anyone else in the system
2) Stack-based buffer overflow (CVE-ID: CVE-2019-7524)
CWE-ID: CWE-121 - Stack-based buffer overflow
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:U/U:Clear
The vulnerability allows a local user to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when reading FTS or POP3-UIDL header from dovecot index. A local user can modify Dovecot index, trigger stack-based buffer overflow and execute arbitrary code on the target system with privileges of the Dovecot process.
Remediation
Install update from vendor's website.