SB2018020125 - Ubuntu update for Dovecot
Published: February 1, 2018
Security Bulletin ID
SB2018020125
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
2
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Authentication bypass (CVE-ID: CVE-2013-6171)
CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local attacker to bypass authentication on the target system.
The weakness exists due to checkpassword-reply performs setuid operations. A local attacker can attach to the process and use a restricted file descriptor to modify account information in the response to the dovecot-auth server, bypass authentication and access virtual email accounts.
2) Memory leak (CVE-ID: CVE-2017-15132)
CWE-ID: CWE-401 - Missing release of memory after effective lifetime
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The weakness exists due to improper memory handling when the software aborts a Simple Authentication and Security Layer (SASL) authentication process. A remote attacker can reuse log-in processes to trigger a memory leak, consume excessive amounts of memory resources and cause the service to crash.
Remediation
Install update from vendor's website.