PT-2020-16991 · Chirpstack · Chirpstack Network Server

Emmanuel Ouanounou · Published 2020-11-09 · Updated 2024-08-04 · CVE-2020-28349

Positive Technologies (AI Summary)

CVSS v2.0

6.8

Medium

Base vector

AV:N/AC:L/Au:S/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions ChirpStack Network Server version 3.9.0

Description The issue is related to an inaccurate frame deduplication process, allowing a malicious gateway to perform an uplink Denial of Service via malformed frequency attributes in the CollectAndCallOnceCollect function in internal/uplink/collect.go. The vendor notes that there are no guarantees of network security when allowing untrusted LoRa gateways to the network.

Recommendations For ChirpStack Network Server version 3.9.0, consider restricting access to untrusted LoRa gateways to minimize the risk of exploitation. As a temporary workaround, consider disabling the CollectAndCallOnceCollect function until a patch is available. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2020-28349

Affected Products

Chirpstack Network Server

References · 6

• 🔥 https://cyberark.com/resources/threat-research-blog/lorawan-mqtt-what-to-know-when-securing-your-iot-network · Exploit
• https://github.com/brocaar/chirpstack-network-server/commit/874fc1a9b01045ebe8a340f0bb01ed19e8256e60 · Patch
• https://github.com/brocaar/chirpstack-network-server/commit/f996bb0c6c85281b5658f59ff09db1b4a73db453 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2020-28349 · Security Note
• https://osv.dev/vulnerability/CVE-2020-28349 · Vendor Advisory
• https://t.me/cvenotify/89033 · Telegram Post