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CVE-2020-15703

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-4537-1
Posted Sep 24, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4537-1 - Vaisha Bernard discovered that Aptdaemon incorrectly handled the Locale property. A local attacker could use this issue to test for the presence of local files.

tags | advisory, local
systems | linux, ubuntu
advisories | CVE-2020-15703
SHA-256 | 815736b0ec981d8eda1504e2479ccd1ea50235c60829dcac09ac3fee95d3e2ec
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