Resource management error in dovecot (Alpine package)

1) Resource management error

EUVDB-ID: #VU18400

Risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-11499

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

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

The vulnerability exists due to incorrect resource management error within the submission-login when processing incorrect authentication messages over TLS secure channel. A remote attacker can send an invalid authentication message and crash the service.

Mitigation

Install update from vendor's website.

Vulnerable software versions

dovecot (Alpine package): 2.3.2.1-r0 - 2.3.5.1-r1

CPE2.3

• cpe:2.3:a:alpine:dovecot_alpine_package:2.3.2.1-r0:*:*:*:*:alpine_linux:*:3.7
• cpe:2.3:a:alpine:dovecot_alpine_package:2.3.4.1-r0:*:*:*:*:alpine_linux:*:3.9
• cpe:2.3:a:alpine:dovecot_alpine_package:2.3.4.1-r1:*:*:*:*:alpine_linux:*:3.9

External links

https://git.alpinelinux.org/aports/commit/?id=1a3664292d8641c136f1b09d244490108ffe7799
https://git.alpinelinux.org/aports/commit/?id=4cbff22201d9f2fb21d860bae0e62f3bf814ed45
https://git.alpinelinux.org/aports/commit/?id=7f9b5fbadaf37d0e9b4a716239593edb14d4db6b
https://git.alpinelinux.org/aports/commit/?id=f82ad4a4bd0bcfe6c75ff43189ad29dc14c38add

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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