Severe Security Vulnerability Discovered in Multiple HP Printer Models
November 30, 2021
Cybersecurity experts have revealed the existence of longstanding security vulnerabilities that affect a substantial range of HP multifunction printers (MFPs). Specifically, these flaws, which have persisted for eight years, could allow malicious actors to gain control of affected devices, exfiltrate sensitive data, and compromise enterprise networks for further attacks. The two vulnerabilities, collectively known as Printing Shellz, were identified and reported by researchers Timo Hirvonen and Alexander Bolshev from F-Secure Labs on April 29, 2021. This prompted HP to issue patches to address these issues earlier this month.
The vulnerabilities are categorized under two Common Vulnerabilities and Exposures (CVEs). The first, CVE-2021-39237, has a CVSS score of 7.1 and pertains to an information disclosure vulnerability that impacts specific models within the HP LaserJet, HP LaserJet Managed, HP PageWide, and HP PageWide Managed series. The second vulnerability, CVE-2021-39238, scored significantly higher at 9.3 and concerns a buffer overflow vulnerability affecting select HP Enterprise LaserJet, HP LaserJet Managed, HP Enterprise PageWide, and HP PageWide Managed products.
The implications of these vulnerabilities are particularly alarming for enterprises, as the flaws open avenues for unauthorized access to sensitive organizational data. Through these weaknesses, an adversary could employ various tactics associated with the MITRE ATT&CK framework. Initial access might be gained through exploitation of these vulnerabilities, while persistence could be achieved by maintaining access to the compromised devices for further exploitation. Moreover, privilege escalation techniques could allow attackers to elevate their access rights, enabling broader control over the network environment.
Organizations using the affected HP printer models are urged to implement the patches provided by HP as soon as possible to mitigate the risks. The potential for these vulnerabilities to facilitate data breaches and other malicious activities should not be underestimated, especially in environments that rely on the confidentiality and integrity of sensitive information.
As the cybersecurity landscape continues to evolve, it is critical for business owners to remain vigilant. Regular updates and patch management practices should be prioritized to address vulnerabilities promptly and defend against malicious tactics employed by adversaries. This incident underscores the necessity of understanding the frameworks of cybersecurity, such as MITRE ATT&CK, which can elucidate the tactics and techniques that may be leveraged in these types of attacks.
In sum, the discovery of these security flaws in HP printers serves as a crucial reminder of the ongoing challenges in cybersecurity. The need for proactive measures has never been more significant, as enterprises navigate the complexities of protecting sensitive information in an interconnected world.