Buffer overflow in F@st 3890 and F@st 3686 - CVE-2019-19494
Published: January 14, 2020 / Updated: April 1, 2020
Vulnerability identifier: #VU24232
CSH Severity: High
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-19494
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing packets sent to spectrum analyzer build-in feature. By default the affected router accepts requests from local network only, however an attacker can craft a specially crafted webpage and use victim's browser to deliver malicious request to the affected router, e.g. via websockets and a specially crafted JSON payload.
Note, this vulnerability was dubbed Cable Haunt by the researcher.
Affected software
F@st 3890
F@st 3686
CG3700EMR
C6250EMR
TC7230 STEB
CH7284e
CH7486e
F@st 3686
CG3700EMR
C6250EMR
TC7230 STEB
CH7284e
CH7486e
How to mitigate CVE-2019-19494
Install updates from vendor's website.
F@st 3890 - addressed in versions 05.76.6.3f, 50.10.21_T4
F@st 3686 - addressed in versions 3.428.0, 4.83.0
F@st 3686 - addressed in versions 3.428.0, 4.83.0