Description
There is no input validation on the Locale property in an apt transaction. An unprivileged user can supply a full path to a writable directory, which lets aptd read a file as root. Having a symlink in place results in an error message if the file exists, and no error otherwise. This way an unprivileged user can check for the existence of any files on the system as root.
CVSS breakdown
CVSS 3.1
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Affected products
- Canonical / aptdaemonunspecified – 1.1.1+bzr982-0ubuntu32.2
- Canonical / aptdaemonunspecified – 1.1.1+bzr982-0ubuntu19.4
- Canonical / aptdaemonunspecified – 1.1.1+bzr982-0ubuntu14.4