The Patching Friars' AlmanacA calendar of CVE saints

January 7

Cable HauntHoly card for cablehaunt, generated with AI (Claude, Anthropic) for the Lunario dei Frati Patchatori.CC BY-NC-SA 4.0 Cable Haunt SPIRITUS IN MODEMO
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Saint Cable Haunt, Specter of the Cable Modem

Patron of modems nobody ever updates and diagnostic tools left open on the home network.

Life

He dwelt in the spectrum analyzer of Broadcom-based cable modems, a technician's tool reachable from the home network. A web page with a little JavaScript was enough for the victim's browser to talk to him, and a buffer overflow handed the modem to the attacker. His discoverers estimated up to 200 million possessed modems, in Europe alone.

Prayer

O Saint Cable Haunt, who haunts the modem at the end of the hallway, deliver us from forgotten debug interfaces and ISP firmware. Amen.

How to celebrate

Celebrated by calling your provider to ask for a firmware update, and listening to hold music until evening.

Old modem, new ghost.

Technical record

Disclosed on
January 7 2020
CVE
CVE-2019-19494CVE-2019-19495

Broadcom based cable modems across multiple vendors are vulnerable to a buffer overflow, which allows a remote attacker to execute arbitrary code at the kernel level via JavaScript run in a victim's browser. Examples of affected products include Sagemcom F@st 3890 prior to 50.10.21_T4, Sagemcom F@st 3890 prior to 05.76.6.3f, Sagemcom F@st 3686 3.428.0, Sagemcom F@st 3686 4.83.0, NETGEAR CG3700EMR 2.01.05, NETGEAR CG3700EMR 2.01.03, NETGEAR C6250EMR 2.01.05, NETGEAR C6250EMR 2.01.03, Technicolor TC7230 STEB 01.25, COMPAL 7284E 5.510.5.11, and COMPAL 7486E 5.510.5.11.

Sources: cablehaunt.com

Also remembered today

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