Vulnerability identifier: #VU10346

Vulnerability risk: Medium

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

CVE-ID: CVE-2017-15132

CWE-ID: CWE-401

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Dovecot
Server applications / Mail servers

Vendor: Dovecot

Description
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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Dovecot: 2.0.0 - 2.3.0

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External links
http://github.com/dovecot/core/commit/1a29ed2f96da1be22fa5a4d96c7583aa81b8b060.patch

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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