SB2018030301 - Debian update for dovecot

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Out-of-bounds read (CVE-ID: CVE-2017-14461)

The vulnerability allows a remote authenticated attacker to obtain potentially sensitive information or cause DoS condition on the target system.

The weakness exists due to improper parsing of crafted email messages. A remote attacker can send a specially crafted email message over SMTP, trick the victim into opening it, trigger an out-of-bounds read and gain access to potentially sensitive information or cause the service to crash.

2) Resource exhaustion (CVE-ID: CVE-2017-15130)

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to excessive memory usage. A remote attacker can cause the service to crash.

3) Memory leak (CVE-ID: CVE-2017-15132)

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.

References

• https://www.dovecot.org/list/dovecot-news/2018-February/000370.html
• https://github.com/dovecot/core/commit/1a29ed2f96da1be22fa5a4d96c7583aa81b8b060.patch