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Description
The program uses the chroot() system call to create a jail, but does not change the working directory afterward. This does not prevent access to files outside of the jail.
Improper use of chroot() may allow attackers to escape from the chroot jail. The chroot() function call does not change the process’s current working directory, so relative paths may still refer to file system resources outside of the chroot jail after chroot() has been called.
The chroot() system call allows a process to change its perception of the root directory of the file system. After properly invoking chroot(), a process cannot access any files outside the directory tree defined by the new root directory. Such an environment is called a chroot jail and is commonly used to prevent the possibility that a processes could be subverted and used to access unauthorized files. For instance, many FTP servers run in chroot jails to prevent an attacker who discovers a new vulnerability in the server from being able to download the password file or other sensitive files on the system.
Modes of Introduction:
– Implementation
Likelihood of Exploit: High
Related Weaknesses
CWE-573
CWE-669
Consequences
Confidentiality: Read Files or Directories
Potential Mitigations
CVE References
