CVE-2003-0036 in ml85p
Summary
by MITRE
ml85p, as included in the printer-drivers package for Mandrake Linux, allows local users to overwrite arbitrary files via a symlink attack on temporary files with predictable filenames of the form "mlg85p%d".
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Analysis
by VulDB Data Team • 04/21/2019
The vulnerability identified as CVE-2003-0036 resides within the ml85p printer driver component of Mandrake Linux systems, representing a classic file system race condition exploit that enables local privilege escalation through symbolic link manipulation. This flaw specifically affects the printer driver package where temporary files are created with predictable naming conventions following the pattern "mlg85p%d", making them susceptible to symlink attacks that can be exploited by unprivileged local users to overwrite arbitrary files on the system. The vulnerability operates under the broader category of insecure temporary file handling, which is classified as CWE-377, and falls within the ATT&CK framework under T1068 for Exploitation for Privilege Escalation and T1059 for Command and Scripting Interpreter.
The technical mechanism behind this vulnerability involves the creation of temporary files with predictable names that are susceptible to symlink attacks during the execution of the printer driver. When the ml85p component processes print jobs, it generates temporary files using the format "mlg85p%d" where %d represents a predictable numeric sequence. Local attackers can create symbolic links with these same names before the legitimate temporary files are created, effectively redirecting the driver's file operations to overwrite files of their choice. This attack vector is particularly dangerous because it allows attackers to manipulate system files or configuration data that may have elevated privileges, potentially leading to privilege escalation or system compromise. The vulnerability stems from the lack of proper file permission checks and the predictable nature of temporary file creation, both of which are fundamental security principles that should be enforced in all system components.
The operational impact of this vulnerability extends beyond simple file overwriting capabilities, as it can be leveraged to escalate privileges and potentially gain unauthorized access to system resources. Attackers exploiting this vulnerability can overwrite critical system files, configuration databases, or even binaries that are executed with elevated privileges, thereby achieving unauthorized system access. The predictability of the temporary file names makes this attack straightforward to execute, requiring minimal reconnaissance efforts from attackers. This vulnerability is particularly concerning in multi-user environments where local users may not have administrative privileges but can exploit this weakness to manipulate system behavior. The impact is further amplified by the fact that printer drivers often run with elevated privileges, making successful exploitation potentially catastrophic for system security.
Mitigation strategies for CVE-2003-0036 should focus on implementing secure temporary file handling practices and addressing the root cause of predictable filename generation. System administrators should ensure that all temporary files are created with unique, non-predictable names using secure randomization techniques and proper file permissions that prevent symbolic link creation. The recommended approach includes using the mktemp command or similar secure temporary file creation utilities that generate unique filenames and automatically set appropriate permissions. Additionally, the printer driver package should be updated to the latest version from Mandrake Linux or the vendor, as this vulnerability was likely patched in subsequent releases. Network segmentation and privilege separation should also be implemented to limit the potential impact of successful exploitation, ensuring that even if an attacker successfully overwrites a file, the damage is contained and does not escalate to full system compromise. The vulnerability highlights the importance of following secure coding practices and implementing proper input validation and file handling procedures to prevent similar issues in other system components.