Ubuntu update for Dovecot



| Updated: 2018-11-29
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2017-2669
CWE-ID CWE-400
Exploitation vector Network
Public exploit N/A
Vulnerable software
 dovecot (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Resource exhaustion

EUVDB-ID: #VU16153

Risk: Low

CVSSv4.0: 6.6 [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:Clear]

CVE-ID: CVE-2017-2669

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform denial of service (DoS)M attack.

The vulnerability exists due to the username sent by the IMAP/POP3 client was sent through var_expand() to perform %variable expansion when 'dict' passdb and userdb were used for user authentication. A remote attacker can send specially crafted %variable fields, use excessive memory and cause the process to crash.

Mitigation

Update the affected packages.

Vulnerable software versions

dovecot (Ubuntu package): 1:2.2.22-1ubuntu2.1 - 1:2.2.24-1ubuntu1.1

CPE2.3 External links

https://www.ubuntu.com/usn/usn-3258-1/


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.



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