CVE-2003-0655 in cdrtools
Summary
by MITRE
rscsi in cdrtools 2.01 and earlier allows local users to overwrite arbitrary files and gain root privileges by specifying the target file as a command line argument, which is modified while rscsi is running with privileges.
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Analysis
by VulDB Data Team • 10/21/2024
The vulnerability identified as CVE-2003-0655 represents a critical privilege escalation flaw within the rscsi utility component of cdrtools version 2.01 and earlier. This issue stems from improper handling of command line arguments that allows local users to manipulate file operations during execution of the privileged utility. The vulnerability manifests when rscsi processes user-specified file paths as command line parameters, creating an opportunity for malicious file overwrite operations that can ultimately result in root privilege escalation. The flaw resides in the utility's failure to properly validate or sanitize file paths provided by users, particularly when these paths correspond to system-critical files or directories. This vulnerability directly impacts the principle of least privilege and demonstrates poor input validation practices that have been classified under CWE-22, which addresses improper limitation of a pathname to a restricted directory, also known as path traversal attacks.
The technical exploitation of this vulnerability occurs through the manipulation of command line arguments that rscsi processes while executing with elevated privileges. When a local user provides a target file path as an argument, the utility may modify or overwrite that file during its execution phase, potentially replacing critical system files or configuration data with malicious content. The privilege escalation aspect arises because rscsi typically runs with root permissions to perform its intended functions, such as SCSI device management or CD/DVD burning operations. Attackers can leverage this by crafting malicious file paths that point to system binaries or configuration files, allowing them to overwrite these targets with malicious content during the execution of rscsi. This type of vulnerability aligns with ATT&CK technique T1068, which covers 'Local Port Forwarding' and 'Exploitation for Privilege Escalation', as it exploits the trusted execution environment of privileged utilities to gain elevated system access. The flaw essentially creates a race condition or predictable file modification scenario where the attacker controls the target file path while the privileged process operates.
The operational impact of CVE-2003-0655 extends beyond simple file overwrites to represent a complete compromise of system security integrity. Local users who can execute the rscsi utility can effectively bypass normal access controls and gain root privileges, which provides them with complete system control including the ability to install backdoors, modify system files, access all user data, and establish persistent access. The vulnerability affects systems where cdrtools is installed and where local users have the ability to execute rscsi commands, which typically includes any user with shell access on Unix-like systems. This type of vulnerability is particularly dangerous in multi-user environments where unprivileged users might not expect to gain root access through seemingly innocuous utilities. The exploitability is relatively straightforward since it only requires local user access and knowledge of the rscsi utility's behavior, making it a common target for both casual attackers and more sophisticated threat actors seeking to establish persistent system compromise. The vulnerability demonstrates a classic case of privilege escalation through insecure file handling and highlights the importance of proper privilege separation and input validation in system utilities. Organizations running affected versions of cdrtools should immediately consider patching or removing the vulnerable utility to prevent exploitation, as the attack vector requires minimal skill and provides maximum impact.
The broader implications of this vulnerability extend to the security practices surrounding system utilities and privilege management. It illustrates how utilities designed for specific tasks can inadvertently create security holes when they fail to properly validate user inputs or when they execute with unnecessary privileges. This flaw serves as a reminder of the importance of following secure coding practices and adhering to the principle of least privilege. The vulnerability also demonstrates the need for comprehensive security testing of system utilities, particularly those that operate with elevated privileges. Organizations should implement regular security audits of installed software packages and maintain updated security patches to protect against such historical vulnerabilities that continue to pose risks in legacy systems. The issue reinforces the fundamental security principle that any utility operating with root privileges must be rigorously tested for input validation and privilege escalation opportunities. This vulnerability type represents a common class of flaws that can be mitigated through proper security architecture practices and adherence to security standards that prevent unauthorized privilege escalation through file system manipulation.