CVE-2011-2697 in Linux Imaging And Printing Project
Summary
by MITRE
foomatic-rip-hplip in HP Linux Imaging and Printing (HPLIP) 3.11.5 allows remote attackers to execute arbitrary code via a crafted *FoomaticRIPCommandLine field in a .ppd file.
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Analysis
by VulDB Data Team • 11/15/2021
The vulnerability identified as CVE-2011-2697 resides within the foomatic-rip-hplip component of HP Linux Imaging and Printing (HPLIP) version 3.11.5, representing a critical security flaw that enables remote code execution through manipulation of PostScript Printer Description (PPD) files. This vulnerability specifically targets the handling of the *FoomaticRIPCommandLine field, which is used by the printing system to specify command line arguments for the foomatic-rip utility. The flaw demonstrates a classic command injection vulnerability where user-controlled input is directly incorporated into system commands without proper sanitization or validation, creating an exploitable path for malicious actors to execute arbitrary code on affected systems.
The technical implementation of this vulnerability stems from improper input validation within the PPD file parsing mechanism. When the system processes a PPD file containing a maliciously crafted *FoomaticRIPCommandLine field, the foomatic-rip-hplip utility fails to properly escape or sanitize the input before incorporating it into shell commands. This design flaw allows attackers to inject additional commands that will be executed with the privileges of the printing service, typically running with elevated permissions to facilitate printer operations. The vulnerability can be exploited remotely through various attack vectors including email attachments, web downloads, or any method that delivers a malicious PPD file to a victim's system. According to CWE classification, this corresponds to CWE-78, which describes improper neutralization of special elements used in OS commands, and CWE-119, addressing insufficient data validation leading to buffer overflow conditions.
The operational impact of CVE-2011-2697 extends beyond simple code execution, as it can lead to complete system compromise when attackers leverage this vulnerability effectively. Since the foomatic-rip-hplip component typically runs with elevated privileges, successful exploitation can provide attackers with the ability to install malware, modify system files, access sensitive data, or establish persistent backdoors on affected systems. The remote nature of the attack means that organizations are vulnerable regardless of their physical location or network segmentation, making this a particularly dangerous flaw in enterprise environments where printing services are widely deployed. This vulnerability directly maps to several ATT&CK techniques including T1059.001 for command and scripting interpreter and T1068 for exploit for privilege escalation, as attackers can use the compromised printing service to gain higher-level system access.
Organizations should implement immediate mitigations including updating to the latest version of HPLIP where this vulnerability has been patched, disabling unnecessary printing services, and implementing strict file validation policies for PPD files. Network segmentation and access controls should be enforced to limit exposure of printing services to untrusted networks. Regular security audits should verify that no outdated HPLIP versions remain in use, and system monitoring should be enhanced to detect unusual command execution patterns. The vulnerability highlights the importance of secure input handling in system components and demonstrates why proper sanitization of user-supplied data is critical in preventing command injection attacks. Additionally, organizations should consider implementing application whitelisting policies to restrict execution of unauthorized binaries that might be installed through exploitation of this vulnerability, and maintain comprehensive backup strategies to recover from potential compromise scenarios.