Input validation error in mosquitto (Alpine package)

1) Input validation error

EUVDB-ID: #VU17467

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-12551

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass password authentication.

The vulnerability exists due to insufficient validation of malformed input in a password file, when it is used for authentication. Incorrect data in password file will be treated by the application as a username with empty password, allowing attacker to gain unauthorized access to the application.

Mitigation

Install update from vendor's website.

Vulnerable software versions

mosquitto (Alpine package): 1.2.3-r0 - 1.4.15-r0

CPE2.3

• cpe:2.3:a:alpine:mosquitto_alpine_package:1.2.3-r0:*:*:*:*:alpine_linux:*:2.6
• cpe:2.3:a:alpine:mosquitto_alpine_package:1.3.1-r0:*:*:*:*:alpine_linux:*:3.0
• cpe:2.3:a:alpine:mosquitto_alpine_package:1.3.4-r0:*:*:*:*:alpine_linux:*:3.1

External links

https://git.alpinelinux.org/aports/commit/?id=cdf3e55bbad03e4036a926c6ec33aae93e695537
https://git.alpinelinux.org/aports/commit/?id=231048d9b3314a33f93647991dc803fdf5cc7ff7
https://git.alpinelinux.org/aports/commit/?id=0615c8c70a2ec6b20460291a2755e9e36f393205
https://git.alpinelinux.org/aports/commit/?id=c000685cbe12c9f51e9d651aff660e8b3ebc8f70

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.