The US Department of Homeland Security’s CERT has urged HP LaserJet printer customers to apply a firmware update that closes a remote execution vulnerability affecting 10 models.
The CERT warning follows a firmware update HP made available last week to close a “potential security vulnerability” in some LaserJet printers that could be exploited remotely to gain unauthorised access to data.
According to DHS CERT, a remote unauthenticated attacker could connect to the telnet debug shell in 10 HP LaserJet models to gain access to data.
Telnet is a network protocol that allows computers to communicate over local area networks or the internet.
According to Christop von Wittich, the security researcher who discovered the flaw, the vulnerable HP printers have an open telnet port, making it possible to remotely access the telnet debug shell, <i>CRN</i> reported. From there, it could be possible for an attacker to disable SSL encrypted communications and reveal passwords to HP cloud services connected to the devices.
DHS notes that general good security practice is to only allow connections from trusted hosts and networks.
Models affected include HP LaserJet Pro M1212nf, M1213nf, M1214nfh, M1216nfh, M1217nfw, and M1219nf, and HotSpot LaserJet Pro M1218nfs, with firmware before 20130211; LaserJet Pro CP1025nw with firmware before 20130212; and LaserJet Pro P1102w and P1606dn with firmware before 20130213.
Late last year Samsung closed a hole in some of its printers that DHS CERT warned could allow attackers to change printer configurations, read network information or stored credentials and access sensitive information passed to it by users.