Finding HP printers and MFPs vulnerable to Printing Shellz
Do you have HP printers and multi-function printers (MFPs)? You might want to look at the two recently published vulnerabilities that affect 150+ models. Named “Printing Shellz” by the F-Secure security researchers who reported them, these vulns have been around for ~8 years.
When successfully exploited, can provide attackers with:
- CVE-2021-39237, “medium” CVSS score of 4.6 - Information disclosure via exposed connectors to gain shell access (requires physical access to the vulnerable device).
- CVE-2021-39238, “critical” CVSS score of 9.8 - Remote code execution via buffer overflow in the font parsing logic.
HP released patched firmware last month and urged owners of affected printers to update their firmware as soon as possible. F-Secure’s researchers also offer some mitigation strategies, as well in section 6 of their writeup.
NOT hardware:"JetDirect" AND (mac_vendor:"HP" OR mac_vendor:="Hewlett Packard%" OR hardware:"HP%" OR hardware:="Hewlett Packard%") AND (type:printer OR os.family:"LaserJet" OR NOT (os:"%iLO%" OR type:switch OR type:computer))
_asset.protocol:http AND protocol:http AND ((html.title:="HP %LaserJet%" OR banner:="HP %LaserJet%") OR (html.title:="HP %PageWide%" OR banner:="HP %PageWide%") OR (html.title:="HP %OfficeJet%" OR banner:="HP %OfficeJet%") OR (html.title:="HP %ScanJet%" OR banner:="HP %ScanJet%"))
February 3, 2023
Finding Lexmark printer assets
Printer manufacturer Lexmark recently published details on a vulnerability that affects over 100 of their printer models. Learn how runZero can help you find potentially affected assets.
December 9, 2022
Finding Cisco 7800 and 8800 series IP phone assets on your network
Cisco 7800 and 8800 IP phones can be found in many companies and organizations. Successful exploitation of this vulnerability can provide an unauthenticated attacker in the same network segment or VLAN with remote code execution or denial-of-service capabilities.
December 5, 2022
Finding MegaRAC BMC assets on your network
MegaRAC can be found in many server manufacturers’ Baseboard Management Controllers (BMCs), including AMD, Ampere Computing, ASRock, Asus, ARM, Dell EMC, Gigabyte, HPE, Huawei, Inspur, Lenovo, Nvidia, Qualcomm, Quanta, and Tyan. Successful exploitation of these …