CVE-2024-48849: Missing Origin Validation in WebSockets vulnerability in FLXEON. Session management was not sufficient to prevent unauthorized HTTPS requests. This issue…

PriorityP259critical9.4CVSS 3.1

AVNACLPRNUINSUCLIHAH

EXPLOIT

EPSS

0.89%

55.4th percentile

Missing Origin Validation in WebSockets vulnerability in FLXEON. Session management was not sufficient to prevent unauthorized HTTPS requests. This issue affects FLXEON: through <= 9.3.4.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
abb	flxeon	<= <= 9.3.4	—

Detection & IOCsextracted from sources · hover to see the quote

filenamewsConnect.js↗

→Monitor for unauthenticated WebSocket connections to FLXEON controllers; the vulnerability allows unauthorized HTTPS requests due to missing origin validation and insufficient session management in wsConnect.js. ↗
→Detect use of 'websocat' tool with --insecure flag and buffer-size 251 targeting FLXEON devices, which is the PoC exploit delivery mechanism for this CVE. ↗
→Alert on log entries containing 'ws connect' from node process on FLXEON devices, which indicates an active WebSocket connection attempt that may be exploitation-related. ↗
→Monitor access to split log files under /usr/local/aam/var/ (xaa, xab, xac, xad), which are artifacts of post-exploitation log exfiltration activity on FLXEON devices. ↗
→Detect JSONRPC messages sent over WebSocket to FLXEON controllers containing START_SERVICE or STOP_SERVICE commands without prior authentication, indicative of exploitation of CVE-2024-48849. ↗

·The vulnerability is only exploitable if the FLXEON device is accessible on the network segment or exposed directly to the internet; network-isolated deployments have reduced risk. ↗
·All FLXEON controller series (FBXi, FBVi, FBTi, CBXi) running firmware 9.3.4 and prior are affected; detections should cover all four product lines. ↗

CVSS provenance

nvdv3.19.4CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H

nvdv4.08.8HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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