Stack-based buffer overflow in mosquitto (Alpine package)

1) Stack-based buffer overflow

EUVDB-ID: #VU21405

Risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-11779

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error when processing an overly long SUBSCRIBE packet containing a topic that consists of approximately 65400 or more '/' characters. A malicious MQTT client can send a specially crafted SUBSCRIBE packet, trigger stack overflow and perform denial of service attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

mosquitto (Alpine package): 1.5.2-r0 - 1.5.6-r0

CPE2.3

• cpe:2.3:a:alpine:mosquitto_alpine_package:1.5.2-r0:*:*:*:*:alpine_linux:*:3.8
• cpe:2.3:a:alpine:mosquitto_alpine_package:1.5.3-r0:*:*:*:*:alpine_linux:*:3.8
• cpe:2.3:a:alpine:mosquitto_alpine_package:1.5.3-r1:*:*:*:*:alpine_linux:*:3.8

External links

https://git.alpinelinux.org/aports/commit/?id=68e4e4a13ae7d52d37708f6d7393a5a6ef0ef856
https://git.alpinelinux.org/aports/commit/?id=d2a7f0ccf6f57e24ef70b4177a6b763d7c747982
https://git.alpinelinux.org/aports/commit/?id=1a43a53ec67e2c5ca5fa770026cd904d745f32a1

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.