PT-2021-6512 · Eclipse+2 · Eclipse Mosquitto+2

Syncxxx Song · Published 2021-08-30 · Updated 2023-11-21 · CVE-2021-34434

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Name of the Vulnerable Software and Affected Versions Eclipse Mosquitto versions 2.0 through 2.0.11

Description The issue is related to the dynamic security plugin in Eclipse Mosquitto. When the ability for a client to make subscriptions on a topic is revoked while a durable client is offline, existing subscriptions for that client are not revoked. This is due to an authorization flaw. The exploitation of this flaw allows a remote attacker to access confidential data.

Recommendations For Eclipse Mosquitto versions 2.0 through 2.0.11, as a temporary workaround, consider disabling the dynamic security plugin until a patch is available. Restrict access to the subscription functionality for durable clients to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Incorrect Authorization

Improper Authorization

Weakness Enumeration

CWE-863

CWE-285

Related Identifiers

BDU:2022-01772

CVE-2021-34434

DSA-5511-1

MGASA-2021-0445

OPENSUSE-SU-2024:11575-1

USN-6492-1

Affected Products

Eclipse Mosquitto

Linuxmint

Ubuntu

References · 26

• 🔥 https://bugs.eclipse.org/bugs/show_bug.cgi?id=575324 · Exploit
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K4WWGVF5BUFPYPCFUPPP4KRIYI5OTJN2 · Vendor Advisory
• https://osv.dev/vulnerability/DSA-5511-1 · Vendor Advisory
• https://osv.dev/vulnerability/MGASA-2021-0445 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-6492-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-0809 · Vendor Advisory
• https://bdu.fstec.ru/vul/2022-01772 · Security Note
• https://ubuntu.com/security/CVE-2021-34431 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-34434 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-34434 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-41039 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-3592 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-34434 · Security Note
• https://advisories.mageia.org/MGASA-2021-0445.html · Security Note
• https://osv.dev/vulnerability/CVE-2021-34434 · Vendor Advisory