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CVE-2020-8831

Status Candidate

Overview

Apport creates a world writable lock file with root ownership in the world writable /var/lock/apport directory. If the apport/ directory does not exist (this is not uncommon as /var/lock is a tmpfs), it will create the directory, otherwise it will simply continue execution using the existing directory. This allows for a symlink attack if an attacker were to create a symlink at /var/lock/apport, changing apport's lock file location. This file could then be used to escalate privileges, for example. Fixed in versions 2.20.1-0ubuntu2.23, 2.20.9-0ubuntu7.14, 2.20.11-0ubuntu8.8 and 2.20.11-0ubuntu22.

Related Files

Ubuntu Security Notice USN-4315-2
Posted Jun 15, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4315-2 - USN-4315-1 fixed several vulnerabilities in Apport. This update provides the corresponding update for Ubuntu 14.04 ESM. Maximilien Bourgeteau discovered that the Apport lock file was created with insecure permissions. This could allow a local attacker to escalate their privileges via a symlink attack. Various other issues were also addressed.

tags | advisory, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2020-8831, CVE-2020-8833
SHA-256 | 7347091baf4ebd4bd549c2657d8611e56b9e6996a1c7a1589d41ade876fdb78b
Ubuntu Security Notice USN-4315-1
Posted Apr 2, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4315-1 - Maximilien Bourgeteau discovered that the Apport lock file was created with insecure permissions. This could allow a local attacker to escalate their privileges via a symlink attack. Maximilien Bourgeteau discovered a race condition in Apport when setting crash report permissions. This could allow a local attacker to read arbitrary files via a symlink attack.

tags | advisory, arbitrary, local
systems | linux, ubuntu
advisories | CVE-2020-8831, CVE-2020-8833
SHA-256 | d819c4efafca8506e3f245fcae9dc7047781ae3500f6f819a3a3741e775ed104
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